Sample questions with original passages, one from each tested skill area, with answers and explanations.
Question 1 — Central Ideas and Details (easy)
Marine ecologist Beatriz Camargo and her team extracted sediment cores from seagrass meadows along three coastlines. Although the meadows cover only a small fraction of the seafloor, the cores revealed that their sediments hold carbon at densities far exceeding those of most forest soils — a finding that led the team to describe seagrass meadows as disproportionately important carbon stores.
Which choice best states the main idea of the text?
Coastal ecosystems are more effective than forests at slowing climate change.
Camargo's team found that seagrass meadows store carbon at unusually high densities despite covering little of the seafloor.
Camargo's team collected sediment cores from seagrass meadows along three coastlines.
Seagrass sediments hold less carbon than most forest soils do.
Answer: B. The text builds to the finding that seagrass sediments hold carbon at densities exceeding most forest soils despite the meadows' small area — the 'disproportionately important' conclusion.
Question 2 — Inferences (medium)
Great tits in several European cities sing at higher minimum frequencies than great tits in nearby forests, an adjustment that keeps their songs audible over low-pitched traffic noise. But higher-pitched songs are not automatically better: when researchers played recordings of urban songs in quiet forests, forest females responded less strongly to them than to typical forest songs, suggesting that ______
Which choice most logically completes the text?
urban great tits sing at higher minimum frequencies than forest great tits do.
urban and forest great tits will eventually become separate species.
the song traits that help urban males be heard may make their songs less attractive in quieter habitats.
forest females generally prefer higher-pitched songs to lower-pitched ones.
Answer: C. The experiment showed weaker female response to urban songs in quiet forests, licensing exactly one conclusion: the urban adjustment can carry a cost where noise is absent.
Question 3 — Words in Context (medium)
The naturalist's field notes were remarkably ______: rather than recording only the birds she had set out to observe, she also documented soil temperature, cloud cover, insect activity, and even the scent of the evening air.
Which choice completes the text with the most logical and precise word?
selective
legible
speculative
comprehensive
Answer: D. The colon introduces the evidence: she recorded far more than her target species, so the notes covered everything — they were comprehensive.
Question 4 — Text Structure and Purpose (medium)
Most commercial perfumes blend dozens of aromatic compounds. Composing a perfume, however, involves more than combining pleasant scents. Because some compounds evaporate within minutes while others linger for hours, perfumers must arrange ingredients so that a fragrance unfolds in deliberate stages, from its bright opening notes to its lasting base.
Which choice best describes the function of the underlined sentence in the text as a whole?
It introduces a complication that the rest of the text explains.
It offers an example of a successfully blended perfume.
It summarizes a process described earlier in the text.
It rejects the claim made in the previous sentence.
Answer: A. The underlined sentence signals that blending is harder than it sounds; the following sentence explains why — evaporation rates force deliberate sequencing.
Question 5 — Transitions (easy)
Entomologist Ana Peralta spent more than a decade cataloging the moths of Brazil's Atlantic Forest. ______ her collection now includes over 4,000 specimens, several belonging to species that had never been formally described.
Which choice completes the text with the most logical transition?
For example,
In contrast,
As a result,
Similarly,
Answer: C. The second sentence is the outcome of the decade of cataloging described in the first — a cause-and-effect relationship.
Question 6 — Rhetorical Synthesis (medium)
While researching a topic, a student has taken the following notes:
The axolotl is a salamander native to lakes near Mexico City.
Unlike most salamanders, it keeps juvenile features, such as external gills, throughout adulthood.
It can regenerate entire limbs, heart tissue, and even portions of its brain.
Its wild population has declined sharply as its lake habitat has shrunk.
Scientists study it as a model organism for tissue regeneration.
The student wants to emphasize the axolotl's importance to scientific research. Which choice most effectively uses relevant information from the notes to accomplish this goal?
Native to lakes near Mexico City, the axolotl keeps juvenile features, such as external gills, throughout adulthood.
Because the axolotl can regenerate limbs, heart tissue, and even portions of its brain, scientists rely on it as a model organism for studying tissue regeneration.
The axolotl's wild population has declined sharply as its lake habitat near Mexico City has shrunk.
Scientists expect the axolotl to soon make it possible to regrow injured human limbs.
Answer: B. Only choice B makes the research role the main assertion and supports it with the regeneration facts from the notes.
Question 7 — Boundaries (medium)
A comet's dust tail always points away from the ______ pressure from sunlight constantly pushes its dust grains outward.
Which choice completes the text so that it conforms to the conventions of Standard English?
Sun; radiation
Sun, radiation
Sun radiation
Sun; because radiation
Answer: A. Both halves are independent clauses, and a semicolon is the only offered joining that links two independent clauses correctly.
Question 8 — Form, Structure, and Sense (medium)
The library's collection of hand-drawn maps, stored for decades in the basement archives, ______ finally been digitized.
Which choice completes the text so that it conforms to the conventions of Standard English?
have
are
were
has
Answer: D. The subject is the singular noun 'collection'; the plural nouns 'maps' and 'archives' sit inside modifying phrases and do not control the verb.