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Question 1
Guide question D01
Foundation
A neighborhood greenhouse gives residents access to seedlings that are difficult to grow on apartment windowsills. Its shared watering schedule, however, initially caused confusion: some trays were watered twice, while others were overlooked. After volunteers introduced a tray-by-tray checklist, those problems became uncommon. The greenhouse now supplies more seedlings than its members can use, although coordinating volunteers still requires regular attention.
Which choice best states the central idea of the text?
Why this answer
Correct choice: The greenhouse provides a useful resource, but making it work requires ongoing coordination.
B covers both the greenhouse's practical benefit and the coordination needed to sustain it. The checklist is evidence of how members addressed a management problem, not the entire subject of the text.
A: The final sentence explicitly says coordination still requires attention.
C: The greenhouse produces a surplus; the text describes neither a shortage nor a replacement.
D: The checklist concerns shared greenhouse care. It does not explain the difficulties of growing seedlings on apartment windowsills.
If you missed it: Write a one-sentence summary that includes both what the project achieves and what it requires.
In a hypothetical clothing-repair project, volunteers recorded how many damaged shirts could be repaired within twenty minutes. During the first month, they completed 38 of 60 shirts within that limit. During the second, they completed 49 of 60. The volunteers did not record how long the remaining shirts took, and some of those shirts were sent to a specialist. No information was collected about how long any repaired shirt remained wearable.
According to the text, what improved during the second month?
Why this answer
Correct choice: The number of shirts repaired within twenty minutes
D matches the recorded outcome: the count completed within twenty minutes increased from 38 to 49. The text deliberately limits what the records establish.
A: Durability was not measured.
B: The times for shirts taking more than twenty minutes were not recorded, so an average for all shirts cannot be calculated.
C: Both months involved 60 shirts. The total did not increase.
If you missed it: Underline the exact outcome measured, including its time limit. Reject answers that substitute another outcome.
At dusk the harbor windows catch the light; the boats become a row of quiet marks. I cannot tell which hull is newly painted, which carries scars beneath its brightened name. By morning I will know them all again. Tonight I let them share a single shape.
Which choice best states the central idea of the poem?
Why this answer
Correct choice: The speaker accepts a temporary view in which familiar differences are obscured.
A joins the visual change with the speaker's response. Dusk makes individual boats difficult to distinguish, and the speaker willingly accepts that temporary shared appearance. The expectation of recognizing them in the morning limits the change.
B: The unfamiliarity is temporary, and the poem does not express regret.
C: Letting the boats share a shape tonight does not mean rejecting the value of their histories.
D: Dusk obscures the differences; it does not reveal details hidden by daylight.
If you missed it: Identify the literal change, the speaker's attitude toward it, and any word that limits its duration.
In a hypothetical field survey, researchers counted young plants on both sides of several solid fences. The species' seeds were carried mainly by wind. Although the researchers found similar numbers of newly arrived seeds on the two sides, they found more surviving seedlings on the sheltered side. They had not yet measured soil moisture, light, or temperature. They therefore planned to investigate conditions affecting seedlings after seeds reached the ground.
Which inference is most strongly supported by the text?
Why this answer
Correct choice: The difference in seedling numbers is unlikely to be explained solely by the number of arriving seeds.
C follows from the mismatch between similar seed arrivals and different seedling survival. Arrival counts alone do not adequately explain why more seedlings remained on one side. The evidence supports investigating later conditions without selecting a specific cause.
A: The arriving seed counts were similar, not much lower on the exposed side.
B: Moisture was not measured. It is a possible explanation, not an established complete explanation.
D: Light was not measured, so equality cannot be inferred.
If you missed it: Separate the stage already compared, seed arrival, from the stage where outcomes differed, later survival.
A music teacher noticed that a quartet repeatedly lost its place at the same entrance. Each player performed the passage accurately alone. During one rehearsal, the teacher asked the players to agree on who would give a visible cue before the entrance. The quartet then completed the passage together three times without losing its place. The teacher decided that another set of individual note-reading exercises was not the most useful immediate response.
Which inference best explains the teacher's decision?
Why this answer
Correct choice: The difficulty appears to involve coordinating the entrance more than reading the individual parts.
A combines two observations: the players could read their own parts, and an agreed cue was followed by successful group entrances. That makes coordination the better immediate target, while leaving open the value of individual practice for other needs.
B: The decision concerns one immediate problem, not all possible benefits of individual practice.
C: The players still needed to perform their notes accurately. A cue addresses when they enter.
D: Nothing suggests deliberate mistakes or establishes the players' motives.
If you missed it: Ask which explanation accounts for both the successful solo performances and the improvement after a shared cue.
A historian studying a hypothetical canal district finds that recorded maintenance spending fell sharply in 1890. Earlier ledgers listed purchased materials and wages. Beginning in 1890, the district continued buying materials but required boat operators to provide a fixed number of unpaid maintenance days. The later ledgers recorded purchases but contained no monetary value for this labor. The historian cautions against treating the smaller totals as direct evidence that less maintenance occurred.
Which choice most logically completes the historian's reasoning?
Why this answer
Correct choice: Part of the decrease in recorded spending could reflect a shift to labor that no longer appeared as a wage expense.
D identifies a specific reason the spending totals may be misleading: labor could continue while its recorded wage cost disappeared. The historian need not establish that maintenance stayed constant to show that lower spending is not direct proof of reduced work.
A: The ledgers provide no comparison of workers' effectiveness.
B: The altered labor arrangement is precisely what makes the spending totals less comparable.
C: Continuing to buy materials does not establish an unchanged quantity of work. The amount could have risen, fallen, or stayed constant.
If you missed it: Before inferring a real-world decline from a recorded decline, check whether the recording system or payment arrangement changed.
In a hypothetical study, observers counted more moths near a meadow on warm nights than on cool nights. A researcher proposed that moths were more active when the air was warmer. A colleague objected that moths might simply be easier for observers to see on warm nights, without actually moving more. The team sought additional evidence that did not depend on human observers detecting moths in flight.
Which finding, if true, would most directly address the colleague's objection?
Why this answer
Correct choice: Movement sensors attached to a separate sample of moths recorded more flight activity on warm nights.
B measures movement independently of observers' ability to see moths. Its warm-night increase therefore supports the activity explanation while directly addressing the detection concern. It does not prove that temperature is the only cause of activity changes.
A: Observer comfort does not establish what the moths were doing.
C: The presence of flowers and occasional daytime visits does not distinguish activity from visibility at night.
D: A fixed location controls one feature of observation, but visibility could still vary with conditions.
If you missed it: Name the alternative explanation and look for evidence measured in a way that would bypass that explanation.
A student argues that, in an original story, Imani looks forward to leaving her hometown but is uneasy about becoming separated from it. The student needs a quotation that supports both parts of the interpretation. Imani has accepted a job elsewhere and is preparing to depart the next morning.
Which quotation would best support the student's claim?
Why this answer
Correct choice: "She wanted the train to hurry toward tomorrow, yet wished it could carry the sound of this street with her."
C expresses anticipation through wanting the train to hurry and attachment through wishing to take her street's sound along. Together, those details support eagerness to leave and unease about separation.
A: Preparing carefully for departure does not establish both anticipation and attachment to home.
B: The aunt's connection to the neighborhood does not directly reveal Imani's feelings.
D: Concern about a clock does not clearly support either the anticipated new life or unease about losing a connection to home.
If you missed it: Split a two-part claim into two requirements. Your chosen quotation should supply evidence for each.
In a hypothetical study of an old settlement, a historian finds that some houses had kitchens detached from the main building. One explanation is that separation primarily displayed the owners' wealth. The historian proposes instead that, in many houses, separation was a practical response to smoke. No written explanation by the original builders has survived.
Which finding, if true, would most strongly support the historian's proposal over the wealth-display explanation?
Why this answer
Correct choice: Detached kitchens were common even in modest houses, and their placement generally carried cooking smoke away from the main rooms.
D weakens wealth as the main distinguishing factor and connects the arrangement to smoke control. The combination is more useful than either observation alone. It supports the proposed practical explanation without proving that every builder had the same motive.
A: Evidence of wealthy owners is compatible with the competing explanation and says little about smoke.
B: Shared materials do not reveal why the kitchens were separate.
C: Later reuse does not explain the buildings' original separation.
If you missed it: Prefer evidence that both fits the proposed explanation and helps distinguish it from the stated alternative.
In a hypothetical garden experiment, researchers grew the same plant species in low-nutrient and rich soil. Within each soil type, one group received compost and the other did not. All plants received the same light and water. The researchers predicted that compost would increase mean plant height more in low-nutrient soil than in rich soil.
Mean plant height after six weeks
Soil
No compost (cm)
Compost (cm)
Low-nutrient
10
18
Rich
22
24
Hypothetical data; 20 plants per group.
Which statement best uses the table to support the prediction?
Why this answer
Correct choice: Compost increased mean height by 8 cm in low-nutrient soil and by 2 cm in rich soil.
A compares the relevant within-soil changes: 18 - 10 = 8 cm and 24 - 22 = 2 cm. The larger increase in low-nutrient soil supports the prediction even though plants in rich soil were taller overall.
B: The rich-soil compost group averaged 24 cm, compared with 18 cm in low-nutrient soil.
C: The 12 cm baseline difference is accurate, but it does not compare the effects of compost.
D: Height also increased in rich soil, from 22 to 24 cm.
If you missed it: When a claim compares treatment effects, compute treatment minus control separately for each group.
A hypothetical museum began offering free Saturday admission. Staff compared mean Saturday attendance during two four-week periods, one before and one after the change. Visitors were classified as local residents or visitors from outside the area. A staff report stated that the overall attendance increase was accounted for by growth in the local-resident group. The report described the observed pattern without claiming that admission price was its only cause.
Mean Saturday attendance
Mean Saturday attendance, in visitors per Saturday. Local residents: before 40, after 70. Outside-area visitors: before 20, after 20. Hypothetical data; four Saturdays per period.
Hypothetical data; four Saturdays per period.
Which statement best supports the report's description?
Why this answer
Correct choice: Mean local-resident attendance rose from 40 to 70, while mean attendance by other visitors remained at 20.
C matches the bars. The total rose from 60 to 90, an increase of 30, and local-resident attendance also increased by 30. Attendance by visitors from outside the area did not change.
A: Local attendance rose by 30; other attendance rose by zero.
B: Local residents already outnumbered other visitors before the change, 40 to 20.
D: Other-visitor attendance did not increase. The total increase was 30.
If you missed it: Calculate each group's change before explaining an overall change; do not infer causation from a before-and-after pattern alone.
In a hypothetical classroom experiment, equal amounts of water started at the same temperature in two otherwise identical vessels. One vessel had an insulating liner. Students recorded temperatures every ten minutes. A student claimed that the lined vessel lost fewer degrees than the unlined vessel during each of the three intervals shown.
Water temperature during cooling
Water temperature during cooling. At 0, 10, 20 and 30 minutes: lined vessel 70, 60, 50, 40 degrees; unlined vessel 70, 50, 40, 30 degrees. Both begin at 70 degrees.
Hypothetical data; measurements at the plotted times.
Which statement best corrects the student's claim using the graph?
Why this answer
Correct choice: The lined vessel lost fewer degrees during the first interval, but both vessels lost the same number during each later interval.
B distinguishes a warmer temperature from a slower decline. During minutes 0-10, the lined vessel lost 10 degrees and the unlined vessel lost 20. During both later ten-minute intervals, each vessel lost 10 degrees. The lined vessel remained warmer, but its decline was not smaller in every interval.
A: The lined vessel lost 30 degrees overall, whereas the unlined vessel lost 40.
C: The gap reached 10 degrees at minute 10 and stayed at 10 through minute 30.
D: The lined vessel continued cooling, from 60 to 50 to 40 degrees.
If you missed it: For a claim about a rate or decrease, compare changes between points, not simply which line is higher.