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ACT Reading practice test

  • 36 questions
  • 40 minutes
  • Nothing is deducted for a wrong answer
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The Reading section of the ACT practice test — 36 questions. Mark your answers, then press Finish at the bottom to see your score.

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Questions 1–9

Passage A

SOCIAL SCIENCE: Passage A and Passage B both address the topic of “What a Bench Count Cannot Count.”

When Bellweather Plaza replaced its long
wooden benches with metal seats divided by
center armrests, debate followed.
Supporters said the arms helped some
5
people stand and ensured that one sleeper
could not occupy an entire bench. Critics
said the design deliberately displaced
people with nowhere else to rest. Because
both claims concerned use, the city asked
10
a research team to study what changed.
City officials described the change as an
upgrade in safety; neighbors described it
as a narrowing of who could remain.
For six weeks before and six weeks after
15
installation, overhead heat sensors
counted occupants without recording faces.
The sensors produced aggregate measures:
the total number of seating events and the
length of each stay, not the identities or
20
reasons of individuals. After the
replacement, the number of recorded
seating events rose while the average stay
became shorter. Those results could
indicate that more people found seats.
25
They could also indicate that people who
once rested for long periods could no
longer do so comfortably. The sensors
could not determine whether the same
person returned later. A rise in events
30
suggested turnover; by itself, it did not
establish broader access.
To investigate the contrast, researchers
conducted brief interviews and gave
diaries to 30 regular plaza users.
35
Several older respondents said the arms
provided leverage when they stood.
Lunch-hour visitors appreciated finding
open places. Other diarists wrote that
broad bags no longer fit beside them,
40
conversations felt more cramped, and
lying down was impossible. The diaries
supplied granular accounts of particular
bodies and purposes, but they could not
show how common each experience was
45
across the plaza. Because the diary group
consisted of people who had visited
regularly before the redesign, it
represented long-term routines better
than occasional use.
50
Officials asked for a recommendation they
could print. The team declined to supply
one from the present file. Sensor totals
described a pattern without a motive;
diaries described motives without a
55
reliable rate. Treating either source as
a verdict would have required ignoring
the other. The honest finding was
narrower: the redesign changed how long
people stayed, and the city did not yet
60
know what share of that change was
welcome.
The team recommended a reversible trial:
remove the center arms from half the new
benches, leave half unchanged, and repeat
65
both forms of observation. Because the
arms bolt to the frames independently of
the seats, the comparison can be created
without replacing the furniture. That
proposal is less dramatic than declaring
70
the redesign either inclusive or hostile.
Increased turnover is a measured result;
whether turnover represents access,
discomfort, or some mixture remains a
question requiring comparison.

Passage B

The city’s report describes shorter visits
as ambiguous. From the plaza, the change
feels less mysterious. Before the metal
seats arrived, I spent ten mornings asking
5
regular users to record what they did on
the benches and whom they encountered.
People ate breakfast, waited for
appointments, exchanged news, and watched
one another’s belongings. One man who
10
slept there also reminded a street vendor
to take her medicine. Duration was not
empty time; it allowed obligations to
accumulate.
The diary pages had columns for arrival
15
and departure, but the most revealing
entries escaped those boxes. One user drew
arrows between names to show who saved a
place for whom. Another noted that a
conversation begun on Monday resumed on
20
Wednesday. Those records treated repeated
presence as part of the plaza’s function,
not as inefficient occupation.
After the redesign, the city’s sensors
counted more seating events and briefer
25
stays. Officials presented the first
number as evidence of broader access. I
read the two numbers together as churn. A
seat that moves many bodies through
quickly may be available, but it may not
30
support the slow social uses the old
benches hosted.
I repeated the diary walk with several
earlier participants. Ms. Alvarez said the
armrest helped her rise, a benefit that
35
should not be dismissed. Yet she also
stopped bringing her shopping cart because
neither it nor her knees fit comfortably
between the divisions. Two chess players
moved their board to a low wall. The man
40
who had watched the vendor’s bag now
appeared only when the shelter was open at
night.
No one story can represent every plaza
user. Still, these are not merely
45
attitudes toward the benches; they are
descriptions of routines that changed
after installation. A count can show that
a seat was occupied. It cannot tell
whether the person returned to a shared
50
game, kept an appointment, or left because
no comfortable posture was possible.
The sensible response is not to throw away
every armrest. End arms can still offer
leverage, and a few center arms may suit
55
people who want a boundary. But the city
should remove the center divisions from
most benches now, rather than waiting
through another seasonal trial. The
diaries already show which relationships
60
and routines the aggregate totals conceal.
Public seating should permit a range of
durations, including the unhurried
presence through which strangers sometimes
become accountable to one another.

Question 1

Passage A’s qualifications and selection of evidence indicate that its author views the bench redesign primarily as:

Show answer

Answer: C — a change whose effects cannot be judged responsibly from either turnover data or personal accounts alone.

Passage A gives both favorable and unfavorable interview evidence, explains the limitations of sensors and diaries, and recommends a trial using both. That balance shows the author considers the present evidence insufficient for a one-sided judgment.

Question 2

In Passage A, the contrast between “aggregate measures” (line 17) and “granular accounts” (line 42) indicates that “aggregate” most nearly means:

Show answer

Answer: A — combined into overall totals.

The sensors report total users and lengths of stays without individual identities or reasons, whereas the diaries provide person-specific detail. In this contrast, “aggregate” means combined into overall totals.

Question 3

How do the sensor and diary methods described in Passage A differ in the evidence they produce?

Show answer

Answer: C — Sensors quantify patterns of use across the plaza, while diaries describe particular users’ purposes and experiences.

The heat sensors count users and stay length at scale. The diaries supply detailed accounts—such as help standing or difficulty fitting a bag—but cannot establish how common those experiences are.

Question 4

Passage A indicates that the proposed trial can isolate the effect of the center arms (lines 62–68) primarily because those arms:

Show answer

Answer: C — can be removed from selected benches without replacing the seating.

The team proposes removing the center arms from half the benches and leaving half unchanged. Passage A notes that the arms bolt independently of the seats, so the comparison can be created without replacing the furniture. The arms matter as an independently alterable design feature; the passage does not base the trial on the arms’ material, a different site, or equal assignment of diarists.

Question 5

How does Passage A interpret the combination of more seating events and shorter average stays?

Show answer

Answer: B — As evidence of increased turnover that could reflect improved access, discomfort, or both.

B is correct because more seating events and shorter stays indicate increased turnover. Passage A explains that this could mean more people found seats, people left sooner because of discomfort, or both; the sensor counts alone cannot establish broader access.

Question 6

Which choice best summarizes Passage B’s argument?

Show answer

Answer: B — Because quick turnover can conceal the loss of long social uses, the city should preserve some supports but remove most center divisions.

Passage B interprets shorter visits as the loss of sustained routines, acknowledges Ms. Alvarez’s need for leverage, and recommends retaining useful supports while opening most bench spans. The summary preserves both the criticism and the qualification.

Question 7

Which detail from Passage B most directly supports the inference that long bench stays sometimes sustained social relationships involving care or accountability?

Show answer

Answer: D — A man who slept on a bench reminded a street vendor to take her medicine (lines 9–11).

The reminder about medication is a concrete act of care performed within a relationship formed around prolonged plaza use. It most directly shows care or accountability rather than merely occupancy or discomfort.

Question 8

The contrast between the city’s report calling shorter visits “ambiguous” and the author’s claim that from the plaza “the change feels less mysterious” helps establish a tone that is:

Show answer

Answer: B — assured and direct.

Passage B sets the report’s uncertainty against the author’s local claim of clarity, presenting firsthand observation as already able to interpret the change. That opening diction is assured rather than the measured caution of Passage A, and nothing in it is playful or celebratory.

Question 9

How would the author of Passage A most likely respond to the concluding recommendation in Passage B?

Show answer

Answer: D — By accepting the concerns as evidence worth testing but favoring a controlled comparison before a broad change

Passage A treats the negative diary accounts as meaningful but not sufficient to show how common each effect is. Its recommended half-and-half trial indicates that the author would prefer comparison before implementing Passage B’s plaza-wide recommendation.

Questions 10–18

HUMANITIES: This passage is adapted from the essay “The Distance a River Keeps.”

When the Marden theater offered its old
river backdrop to the civic museum, the
gift arrived with a photograph that made
the canvas look considerably better than
5
it looked unrolled across our workroom.
In the photograph, the river disappeared
convincingly behind a row of warehouses;
on the floor, it resembled a gray strap.
I had been hired to prepare the display,
10
and my first proposal treated that loss
of conviction as damage. We would repair
the surface until visitors could admire
what the theater’s original audience had
admired. I had assumed that the picture
15
contained its own instructions for being
seen.
Our curator, Irena Pell, proposed using
the photograph to identify later paint.
A narrow footbridge, visible on the cloth
20
but absent from the image, particularly
troubled her. The museum had promised to
preserve a surviving work by the scenic
studio that supplied the theater, and a
recent bridge might obscure that work.
25
Yet Pell did not propose scraping away
every addition. Where a later coat could
not be removed without injuring earlier
paint, she would leave it and record the
compromise. Her preference was for the
30
earliest recoverable design, not for an
immaculate surface obtained at any cost.
Nolan Veer, who had painted scenery for
the theater before its closing, thought
we were identifying the wrong injury.
35
He asked us to suspend one corner of the
canvas and stand at the far end of the
workroom. The warehouses straightened;
the strap became water. Veer explained
that blunt strokes allowed the picture
40
to cohere across a theater, while the
overhead lamps in our gallery exposed
each stroke separately. His objection
was not that age should be concealed.
A backdrop, he argued, was a device for
45
producing an effect at a distance; its
physical survival preserved only part
of what the painters had accomplished.
Veer also remembered the footbridge. It
had been added for a revival whose last
50
act required an actor to appear to cross
the river, though no surviving program
supplied the revival’s date. Pell agreed
that this made the bridge more than an
idle alteration. She nevertheless asked
55
whether one worker’s memory could justify
presenting it as part of the first design.
The recollection established a use, she
said, not an origin. I initially heard
this distinction as professional caution
60
obstructing a richer story. But Veer
could describe the crossing vividly and
still be uncertain which production had
required it. His certainty had borders.
The photograph, however, had borders too.
65
Its reverse carried a photographer’s
address but no date, and a penciled note
referred to a “new river” without saying
whether the canvas or its painting was
new. A theater inventory listed several
70
river scenes, all in dimensions close to
those of our gift. The image could show
an earlier version of this backdrop or a
different backdrop from the same studio.
Pell withdrew her plan to use it as a
75
map for removing paint. She continued,
however, to distinguish uncertainty about
an alteration from proof of its value.
We eventually displayed the canvas with
its bridge, placing a low rail far enough
80
away to let the river gather itself into
depth. Near the rail, a small photograph
showed the scene under theatrical light;
beside it, an enlargement made the coarse
brushwork legible. The two views were
85
deliberately unequal: neither claimed to
reproduce a historical performance, whose
lamps, actors, and neighboring scenery
we could only partly reconstruct. Pell’s
label distinguished what the cloth showed
90
from what Veer remembered. His account
appeared in a recording, introduced as a
recollection rather than as the missing
page of the museum’s inventory.
I had wanted the display to settle our
95
argument, but it made the disagreement
available to visitors instead. A visitor
who moved closer lost the river and found
the labor; another who stepped back
recovered the illusion while surrendering
100
some evidence of how it had been made.
Neither position was a correction of the
other. Nor did offering both release us
from choosing: the rail, the lighting,
and the label all guided attention. We
105
could disclose those choices, but we
could not convert the gallery into a
place from which nobody had arranged
the view.
This seems to me a modest achievement,
110
though modesty should not become an
excuse for leaving every decision open.
Had the photograph securely identified
the first design, its evidence would have
deserved greater weight. In this case,
115
restraint protected a question we could
not answer, while distance restored an
effect we could demonstrate. The museum
had neither returned the backdrop to its
first evening nor merely stored a piece
120
of cloth. It had given visitors a way to
examine the interval between those two
claims, an interval my original proposal
had so confidently painted out.

Question 10

The main idea of the passage is that:

Show answer

Answer: B — Preservation can honor function while making uncertain historical interpretations visible.

B is supported by the sixth through eighth paragraphs: the display recovers the backdrop’s visual effect while exposing the limits of competing historical interpretations. A elevates Pell’s initial preference for an early design into a general principle the narrator does not endorse. C overstates the effort to recover function, since the sixth paragraph explicitly limits the display’s claim to reconstruct a performance. D mistakes unresolved historical questions for an inability to make responsible decisions, although the completed display demonstrates otherwise.

Question 11

According to the passage, Pell’s initial restoration plan called for:

Show answer

Answer: D — Retaining later paint when removal threatened an underlying layer.

D paraphrases the second paragraph’s statement that Pell would retain and document later paint if removing it would injure earlier paint. A substitutes missing documentation for the physical condition Pell actually specified. B makes a worker’s recollection a requirement that Pell’s initial plan never imposed. C turns the photograph’s proposed use in identifying additions into an unsupported plan to reconstruct early paint.

Question 12

Which circumstance prevented the photograph from serving as a reliable guide for removing paint?

Show answer

Answer: A — Its relationship to the donated canvas could not be established.

A is supported by the fifth paragraph, which explains that the photograph might depict either an earlier version of the donated backdrop or another backdrop from the same studio. B transfers the third paragraph’s discussion of viewing conditions to a problem with the photograph that the passage never identifies. C treats the ambiguous note as a contradiction, although it neither confirms nor refutes Veer’s recollection. D reverses the inventory evidence: several scenes had dimensions close to those of the donated canvas.

Question 13

According to the passage, the museum presented Veer’s account as:

Show answer

Answer: C — A personal account kept distinct from directly observable evidence.

C paraphrases the sixth paragraph, where the label separates what the canvas shows from what Veer remembers and the recording is identified as a recollection. A confuses Veer’s discussion of scenic effects with an account of the studio’s original material choices. B assigns chronological certainty to a memory whose production and date remain uncertain in the fourth paragraph. D reverses the explicit distinction between the recording and a missing inventory page.

Question 14

Pell’s response to the uncertain photograph (lines 74–77) most strongly suggests that she:

Show answer

Answer: B — Separates grounds for preserving paint from evidence of historical importance.

B follows from lines 74–77: Pell stops using the photograph to justify removal but does not treat uncertainty as proof that an alteration is valuable. A invents a general ranking of memories above photographs, whereas the fourth and fifth paragraphs identify limitations in both. C removes Pell’s continuing distinction between an alteration’s uncertain history and its demonstrated value. D mistakes the withdrawal of one unreliable guide for abandonment of her interest in the early design.

Question 15

Based on the passage, what does the narrator’s changing assessment of Veer’s recollection suggest?

Show answer

Answer: D — A vivid account can illuminate function while leaving chronology uncertain.

D combines the fourth paragraph’s recognition that Veer remembers the bridge’s use more securely than its production with the sixth paragraph’s inclusion of that qualified memory in the display. A overlooks the questions about date and origin that Veer’s firsthand experience leaves unresolved. B confuses the vividness that initially impressed the narrator with demonstrated accuracy. C contradicts the museum’s decision to include the recollection despite its chronological limits.

Question 16

In the context of the passage, the discussion of the rail, lighting, and label (lines 101–108) primarily serves to:

Show answer

Answer: A — Acknowledge that revealing disagreements still requires curatorial direction.

A is supported by lines 101–108, which qualify the display’s openness by acknowledging that its arrangement inevitably guides attention. B reverses the preceding statement that the display makes disagreement available to visitors. C imposes a hierarchy on viewing positions that lines 101–102 explicitly decline to establish. D turns an acknowledgment of the museum’s choices into a recommendation about visitor control that the passage never makes.

Question 17

The relationship between the two views described in the sixth paragraph is best characterized as one in which:

Show answer

Answer: C — Each reveals an aspect of the backdrop obscured by the other.

C follows from the sixth paragraph’s pairing of a theatrically lit view with an enlargement exposing brushwork, read alongside the third paragraph’s explanation of how viewing conditions separate illusion from visible strokes. A mistakes evidence of painting technique for verification of historical lighting, which the sixth paragraph says can be reconstructed only partly. B assigns documentary priority to the theatrical view despite the paragraph’s refusal to present either as a historical performance. D confuses differences in viewing conditions with successive stages of physical decay.

Question 18

The narrator’s phrase “so confidently painted out” (line 123) conveys an attitude best described as:

Show answer

Answer: B — Wry self-criticism about having assumed restoration could settle interpretation.

B is supported by the final paragraph’s painting metaphor, which turns the narrator’s original confidence into an admission that the proposed repair would have concealed interpretive uncertainty. A preserves the narrator’s initial impatience with Pell from the fourth paragraph while ignoring the later appreciation of restraint. C contradicts the final paragraph’s acknowledgment of a question the museum cannot answer. D redirects the phrase’s criticism from the narrator’s own proposal to visitors, whose responses are never ridiculed.

Questions 19–27

LITERARY NARRATIVE: This passage is adapted from the novel “The Uncovered Windows.”

Pell retired on a Sunday, leaving his
tuning hammer, his county map, and a
notebook whose appointments occupied
surprisingly little space. At
5
twenty-four, after three years at the
other end of his workbench, I had
expected something denser. Between names
lay whole white afternoons. I penciled
in the driving times, allowing for
10
gravel, and calculated that I could
finish his five-day route by Thursday.
On Monday, Mrs. Marr met me beside a
heap of lumber. The porch roof was gone;
pale rectangles marked where its posts
15
had touched the house. She watched me
notice them. “You’ll have more light,” I
said, reaching for my case. “Yes,” she
said. Inside, I kept Pell’s hammer
plainly visible on the piano, although I
20
wasn’t ready to use it.
I knew this instrument from the shop
records: a stubborn middle register, a
music rack missing one screw. What I
hadn’t expected was the brightness of
25
the room. Mrs. Marr stood near the
window while I worked, touching the
place on her sleeve where a button had
been removed. When I finished, she asked
whether I had a minute. I played a
30
scale, slowly, to demonstrate the
evenness.
“It’s very good,” she said, with an
emphasis I disliked. I began explaining
how long the tuning should hold. She
35
folded the cloth she had brought for
dusting, aligning two edges that were
already aligned. Driving away, I
rehearsed what I should have said about
my training. In the mirror she was still
40
beside the lumber, her cloth hanging
from one hand.
Tuesday’s first client, Mr. Dace, had
practiced the same short piece
throughout Pell’s last decade on the
45
route. After I packed up, he seated
himself and played it. I praised the
clean bass, which had required
considerable work that morning. “That’s
the part I learned,” he said. He played
50
it again, looking straight ahead. I put
my case down, but kept my coat on.
At Mrs. Hobb’s on Wednesday, I tried
arriving differently. I admired her
garden and asked whether she still made
55
the seed cake Pell liked. She glanced at
the clock. “He always stayed for tea,” I
said. “He wasn’t catching my bus,” she
answered. Her uniform hung from the
pantry door. I finished in forty
60
minutes; she inspected the keys, paid
me, and left with me.
That evening I called Pell about the
missing screw. He described a drawer in
his shop, then asked whether Mrs. Marr
65
had taken the roof down. “The porch?
Yes. Was it rotten?” He made a small
sound that might have been amusement.
“She finally did it, then.” I waited
with my pencil ready. In his kitchen a
70
kettle began its thin complaint, and he
went to lift it.
On Thursday, between two farms, I opened
his notebook again. Beside Mrs. Marr’s
name he had recorded the piano’s serial
75
number and the usual problems. There was
nothing about a roof. The same was true
of Mr. Dace’s page: no piece, no bass. I
had mistaken the blank stretches for an
allowance for bad roads. I rubbed out
80
Friday’s appointments, which I had moved
into Thursday.
Mrs. Marr answered when I called about
bringing the screw. “It won’t fall off
before next year,” she said. I told her
85
I would be passing anyway, though hers
was the only house beyond the quarry.
After a moment she said that she would
be home. I left the receiver in its
cradle with my hand around it, as if the
90
arrangement needed holding there.
On Friday she was stacking the shorter
boards under a tarp. This time I carried
two with her before taking out my tools.
“Did someone help you?” I asked. “With
95
the high parts.” She showed me the
little pry bar she had used. Its red
handle had worn through to a yellow one
beneath. “My husband liked sitting under
there. I always took my chair onto the
100
grass.”
Inside, I set the open case on the
windowsill and fitted the screw. The
piano had been turned since Pell’s last
visit: from the bench, Mrs. Marr could
105
see the pear trees instead of the parlor
wall. She sat down and opened a book.
Its pages were soft at the corners, but
several remained joined along the top.
She separated two with an envelope.
110
She played a few measures, stopped, and
went back. I could have supplied the
next notes; I kept my fingers against my
knees. Outside, a truck rattled past the
quarry turn. She waited for it to pass,
115
then began again. “That light gets in
your eyes,” she said, without looking
around.
I set my case beneath the piano. The
rectangle of shade slid off her hands.

Question 19

Which statement best expresses a central idea developed through the narrator’s experiences?

Show answer

Answer: C — Inheriting professional relationships involves noticing what people wish to reveal as well as performing the contracted work.

The narrator gradually attends to Mr. Dace’s achievement, Mrs. Hobb’s schedule, and Mrs. Marr’s changes alongside their pianos. Preserving Pell’s routines fails when the narrator assumes Mrs. Hobb wants a leisurely visit. Independence from Pell’s approval is not the central conflict, since he neither evaluates nor directs her work during the week. Receiving equal recognition describes an early concern that the narrator increasingly sets aside.

Question 20

Mrs. Marr’s behavior during Monday’s visit, considered alongside Friday’s visit, most strongly suggests that the narrator initially mistakes:

Show answer

Answer: A — an unsuccessful invitation to attend to a personal change for an unfavorable assessment of professional ability.

Mrs. Marr watches the narrator notice the missing roof and later asks for time, while the narrator responds with a scale and worries about her credentials. Friday reveals that removing the roof expresses a longstanding preference Mrs. Marr is willing to discuss. No exchange connects her behavior to repair costs. She neither expresses regret about Pell nor demonstrates musical progress during Monday’s visit.

Question 21

As used in lines 78–79, the word “allowance” most nearly means:

Show answer

Answer: B — an amount reserved for an anticipated need.

The narrator originally interprets the empty periods as time reserved to absorb travel delays. Nothing suggests that the notebook records regular payments. The passage does not connect the blank periods to discounted prices. No general requirement is identified from which the roads would justify an exemption.

Question 22

The account of the visit to Mrs. Hobb primarily serves to:

Show answer

Answer: B — qualify the idea that responding to clients beyond the technical task always requires a longer, more sociable visit.

Mrs. Hobb needs timely service, so her visit complicates the apparent lesson of Mr. Dace’s desire for an audience. The paragraph gives no evidence that the narrator’s technical work suffers. Pell’s finances are never discussed. Mrs. Hobb inspects the keys, which provides no basis for treating her limited time as indifference to the piano.

Question 23

How does the first-person narration chiefly shape the reader’s understanding of Monday’s visit?

Show answer

Answer: A — It presents observable gestures through the narrator’s professional anxiety, then supplies later encounters that make another interpretation more persuasive.

The narrator reports Mrs. Marr’s gestures while interpreting the encounter through worries about training, and Friday provides grounds for reconsideration. Her immediate reaction is explicit in her dislike of the emphasis and rehearsal of her credentials. The narration never enters Mrs. Marr’s private thoughts. The passage suggests an initial misunderstanding rather than a deliberate refusal of a correctly understood request.

Question 24

Which detail establishes that the changed setting for Mrs. Marr’s playing involves more than the removal of the porch roof?

Show answer

Answer: C — The piano has been repositioned so that the bench offers a view of the pear trees.

Turning the piano changes what Mrs. Marr can see while playing, independently of the increased light from removing the roof. The softened pages concern the book’s condition rather than the room’s arrangement. The post marks are consequences of the roof’s removal, not evidence of an additional change. Replacing the screw restores the rack but does not establish a changed setting for her playing.

Question 25

What most plausibly accounts for the narrator’s decision to restore Friday’s appointments to their original day?

Show answer

Answer: D — She recognizes that the written technical records do not account for everything that may occupy a visit.

The notebook omits both Mr. Dace’s playing and Mrs. Marr’s porch, prompting the narrator to reconsider the purpose of its apparently unused time. Nothing establishes that her driving estimates were inaccurate. The missing screw was already recorded, and no newly discovered repair backlog causes the change. Mrs. Hobb’s response has shown why reproducing the same leisurely routine at every house would be inappropriate.

Question 26

Which detail most strongly supports the conclusion that the narrator’s return to Mrs. Marr is motivated by more than completing a minor repair?

Show answer

Answer: B — The narrator says she will be passing despite Mrs. Marr’s being the only client beyond the quarry.

The narrator’s inaccurate explanation for being nearby, especially after Mrs. Marr minimizes the repair’s urgency, indicates an additional reason for returning. Consulting Pell about the screw is fully explained by the repair itself. Installing the screw likewise demonstrates completion of the stated task without establishing another motive. Carrying boards shows consideration once she arrives but is weaker evidence about why she arranged the return.

Question 27

The final image of the case’s shadow moving off Mrs. Marr’s hands chiefly serves to:

Show answer

Answer: A — give physical form to the narrator’s growing ability to make room for a client’s activity without directing it.

The narrator has refrained from supplying the notes and now responds to Mrs. Marr’s remark with a small practical adjustment that leaves her playing in the foreground. The tools have just served their proper purpose in repairing the rack, so they are not rejected as professionally useless. Moving the case allows more of the newly available light rather than restoring the former room. The quiet action supports Mrs. Marr’s activity rather than displaying superior judgment.

Questions 28–36

Passage A

NATURAL SCIENCE: Passage A is adapted from the article “Debris with a History.” Passage B is adapted from the book “The Chemistry of a Collision.”

The Moon is an awkward companion for a
rocky planet: substantial beside Earth,
yet disproportionately poor in metallic
iron. Earth locked much of its iron into
5
a core; the Moon has a much smaller core
relative to its size. Any account of
their beginnings must accommodate that
asymmetry while also explaining the
motion of the pair. Capturing an
10
independently formed Moon requires a way
to dissipate its approach energy.
Forming both bodies together leaves
their unequal allotments of iron
demanding explanation. Neither
15
difficulty, by itself, specifies a
collision.
A collision nevertheless gained purchase
because it connected problems that
otherwise seemed separate. In the
20
familiar version, a body roughly the
size of Mars struck the young Earth
obliquely, after metal had already
segregated into the interiors of both
bodies. Much of the impactor’s metal
25
joined Earth, while rocky material
entered orbit and eventually assembled
into the Moon. The selection was
physical: material from outer rocky
layers could furnish a satellite without
30
furnishing it with a planet’s proportion
of iron. An oblique encounter could also
supply the system with considerable
angular momentum, expressed in Earth’s
rotation and the Moon’s orbit.
35
Apollo samples added a different kind of
constraint. The ancient lunar crust
preserves evidence of extensive melting
and differentiation, consistent with a
Moon that began hot. Its depletion in
40
many readily vaporized elements also
invited accounts involving high
temperatures, although neither
observation identifies a unique heating
event or a simple history of escape.
45
Computer simulations supplied what the
rocks could not: demonstrations that
certain collisions could place enough
rocky debris into orbit. Such
calculations made an extraordinary event
50
mechanically credible. Their success did
not turn every feature of a simulated
collision into an observation of the
past.
Indeed, the samples have become more
55
troublesome as their chemistry has
become better known. Earth and Moon
resemble each other in isotope ratios
more closely than the simplest debris
calculations led researchers to expect.
60
That mismatch reaches into the question
of whose rock became the Moon; it is no
decorative blemish. Yet the small lunar
core does not grow larger when an
isotope measurement improves, and the
65
orbital problem does not disappear. A
revised collision must still pass those
older tests. The scattered requirements
continue to draw investigators toward
the same violent neighborhood, even when
70
they disagree about the address.

Passage B

A successful calculation can put a Moon
in the sky and still put the wrong
material into it. In many conventional
giant-impact simulations, most of the
5
orbiting debris comes from the smaller,
incoming body. Apollo rocks, however,
show oxygen isotope ratios remarkably
close to those of Earth’s mantle.
Meteorites demonstrate that bodies
10
formed in the solar system need not
share such ratios. If the incoming body
differed from Earth, a Moon made largely
from that body’s mantle should have
retained a detectable chemical accent.
15
The difficulty emerged from combining
the simulations with the samples, rather
than from either alone.
Oxygen is only the opening objection.
Close Earth–Moon similarities occur in
20
other isotope systems, including
titanium, whose resistance to
vaporization complicates an easy appeal
to exchange through hot gas. One
proposed remedy allows Earth’s mantle
25
and the lunar disk to exchange material
after impact, reducing their initial
differences before the Moon finishes
assembling. But a process capable of
bringing oxygen into agreement need not
30
bring every other element along. The
duration of contact, the amount of
material exchanged, and the behavior of
different elements all matter. Heating
the debris does not automatically erase
35
its ancestry.
Other proposals change the encounter
itself. An impact onto a rapidly
rotating Earth can eject a larger share
of terrestrial material; collisions
40
between bodies more nearly equal in mass
can leave Earth and the lunar debris
with similar mixtures. Some energetic
variants begin with more angular
momentum than the present system
45
possesses and therefore require
subsequent mechanisms to remove the
excess. Still another possibility moves
the chemical agreement earlier: perhaps
the impactor and Earth formed with
50
similar compositions. That possibility
cannot be dismissed merely because other
sampled solar-system bodies differ, but
neither can the missing impactor be
assigned whatever composition makes a
55
calculation convenient.
The multiplication of variants is
sometimes presented as a sign that the
isotope measurements have strengthened
the impact explanation. They have
60
certainly made its requirements more
exacting. Whether they have strengthened
a particular reconstruction depends on
what that reconstruction predicts beyond
the resemblance it was designed to
65
accommodate. A model that reproduces
isotope ratios while leaving an
unexplained surplus of angular momentum
has moved the difficulty. At the
laboratory bench, another small
70
distinction between terrestrial and
lunar material may prove more useful
than another declaration of agreement:
it could separate histories that
currently end with nearly
75
indistinguishable rocks.

Question 28

Which statement best expresses the central idea of Passage A?

Show answer

Answer: C — The giant-impact explanation retains force by connecting several constraints, even though chemical evidence requires substantial reconsideration of the event.

The author connects the Moon’s iron content, the system’s motion, and evidence of heating while acknowledging a serious isotopic challenge. The claim about a uniquely established heating event contradicts the stated limits of the samples. The claim that the explanation chiefly demonstrates possibility understates the continuing force of the combined constraints. The claim that support has shifted toward alternative origins reverses the direction of the final paragraph.

Question 29

In Passage A, why is the segregation of metal before the collision important to the explanation of the Moon’s composition?

Show answer

Answer: A — It makes material from the bodies’ outer layers a plausible source of a satellite with a relatively small metallic core.

Earlier segregation placed metal inside the bodies, allowing outer rocky material to supply the Moon while much of the impactor’s metal joined Earth. The heating explanation introduces a mechanism for metal removal that the passage does not give. The core-as-debris explanation reverses the described destinations of metal and rock. The initial-iron explanation replaces the passage’s selective redistribution with an unsupported difference in starting composition.

Question 30

How does the third paragraph of Passage A develop the account presented in the second paragraph?

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Answer: D — It supplies additional evidence and a feasibility demonstration while limiting how specifically either can reconstruct the proposed collision.

The third paragraph adds sample evidence and simulations but explicitly limits their ability to identify a unique event or recover its details. The ranking of samples above calculations reverses the passage’s assignment of mechanical demonstration to simulations. The confirmation of collision details contradicts the qualifications about both heating and simulated features. The claim about competing explanations invents a shift away from the collision account that the paragraph does not make.

Question 31

In Passage A, “purchase” in line 17 most nearly means:

Show answer

Answer: B — an intellectual foothold.

The collision explanation gains acceptance because it connects previously separate problems, so an intellectual foothold fits the context. A financial acquisition would require an exchange or ownership absent here. A mechanical advantage concerns force and machinery rather than the explanation’s persuasiveness. A physical handhold literalizes the image even though the subject is an explanation.

Question 32

Suppose experiments established that postimpact exchange could equalize oxygen isotope ratios but could transfer almost no titanium. Which conclusion would be most consistent with Passage B?

Show answer

Answer: B — The experiments would weaken exchange as a complete explanation of the resemblance while leaving an initially similar impactor as a possibility.

The author argues that explaining oxygen alone may leave other isotope similarities unexplained and separately allows that Earth and the impactor began alike. Failure to transfer titanium would not itself identify Earth as the source of the debris. Treating oxygen agreement as a complete solution ignores the passage’s explicit extension of the problem to other elements. Favoring an initially similar impactor would not eliminate the independent requirement to account for angular momentum.

Question 33

In Passage B, how does the proposed exchange between Earth’s mantle and the lunar disk differ from the proposed impact onto a rapidly rotating Earth?

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Answer: D — Exchange reduces differences after debris is produced, whereas rapid rotation can change how much of that debris comes from Earth.

The exchange proposal alters the relationship between materials after impact, while rapid rotation can increase the terrestrial contribution to the debris. Requiring initial similarity reverses the purpose of exchange, which is to reduce initial differences. Removing surplus motion is a separate requirement discussed for some energetic variants, not the stated role of exchange. Changing the colliding bodies’ masses belongs to another proposed encounter, not to mantle–disk exchange.

Question 34

Which judgment about revised impact models is best supported by Passage B?

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Answer: A — Their accommodation of isotope similarities becomes more persuasive when they also meet constraints that did not motivate that accommodation.

The author asks what a reconstruction predicts beyond the resemblance it was designed to explain and insists that angular momentum also be accounted for. The claim that chemical agreement becomes less important confuses difficulty distinguishing models with a relaxation of their requirements. The claim that variety itself strengthens the explanation is a view the author reports and qualifies. Allowing chemistry to compensate for unexplained motion contradicts the example of a model that merely moves the difficulty.

Question 35

Which pair of details from Passage B best supports the author’s suggestion that nearly indistinguishable rocks can result from different histories?

Show answer

Answer: C — Exchange after impact could reduce initial chemical differences, and the incoming body could already have resembled Earth chemically.

Postimpact convergence and similarity before impact provide two distinct histories that could yield comparable final chemistry. Meteorite differences and impactor-dominated debris establish the original problem rather than alternative routes to resemblance. Titanium’s resistance and excess angular momentum identify constraints without describing histories that converge chemically. Similarities in two isotope systems establish the breadth of the resemblance but do not explain how different histories could produce it.

Question 36

Suppose a simulation produced an iron-poor Moon and reproduced the Earth–Moon system’s motion, but required lunar isotope ratios substantially different from those measured. How would the authors most likely assess that result?

Show answer

Answer: C — Both would recognize meaningful achievements but regard the compositional discrepancy as a barrier to treating it as an adequate reconstruction.

Passage A distinguishes mechanical credibility from recovery of the actual event and calls the isotope mismatch substantial; Passage B likewise rejects a calculation that produces the wrong material. Treating chemistry as secondary conflicts with both authors’ assessments of its importance. Full acceptance by Passage A’s author and wholesale rejection of simulations by Passage B’s author both exceed their positions. Neither passage makes a failed compositional prediction evidence for the specified alternative origins.

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