TOEFL Vocabulary & Word Usage 3 — Questions and Answers
Question 1: Which sentence uses the word "mitigate" correctly in an academic context?
- Scientists mitigated the discovery of a new species in the rainforest.
- Planting coastal mangroves can mitigate the impact of storm surges on vulnerable communities. (Correct answer)
- The study mitigated that climate change was primarily human-caused.
- The professor mitigated her lecture by adding more examples.
Correct answer: Planting coastal mangroves can mitigate the impact of storm surges on vulnerable communities.
"Mitigate" means to lessen or moderate the severity, seriousness, or painfulness of something. In Option B, mangroves lessen the harmful impact of storm surges—correct usage. Option A misuses it (you don't "mitigate" a discovery); C confuses it with "demonstrated"; D uses it incorrectly as a synonym for "improved."
Question 2: Which word correctly fills the blank: "The philosopher's argument, while intellectually stimulating, was ultimately ________ because it relied on premises that could not be empirically tested."
- Irrefutable
- Unfalsifiable (Correct answer)
- Paradoxical
- Rudimentary
Correct answer: Unfalsifiable
"Unfalsifiable" means impossible to prove false through empirical testing—a key critique in philosophy of science. An argument based on untestable premises is unfalsifiable. "Irrefutable" would mean it cannot be refuted (positive); "paradoxical" implies self-contradiction; "rudimentary" means basic or undeveloped.
Question 3: In academic writing, which sentence correctly uses "infer" and "imply"?
- The data infers that population growth has slowed; the author implies her conclusion carefully.
- The author implies that urbanization causes pollution; readers can infer this from the statistics provided. (Correct answer)
- The author infers a connection between pollution and urbanization; the readers imply this.
- Data can imply conclusions, and authors can also imply the same conclusions.
Correct answer: The author implies that urbanization causes pollution; readers can infer this from the statistics provided.
"Imply" means to suggest something without stating it directly (speakers/writers imply); "infer" means to derive a conclusion from evidence (readers/listeners infer). Authors imply; readers infer. Option B correctly uses both: the author implies, and readers can infer from the data.
Question 4: Select the word that best completes the sentence in an academic context: "The results were ________, as they varied significantly across different experimental conditions, making it difficult to draw conclusions."
- Consistent
- Anomalous
- Inconclusive (Correct answer)
- Definitive
Correct answer: Inconclusive
"Inconclusive" means not leading to a clear conclusion—precisely what is described when results "vary significantly" and conclusions are "difficult to draw." "Consistent" and "definitive" would imply clear, reliable results; "anomalous" suggests results are unusual relative to expectations but doesn't specifically mean they prevent conclusions.
Question 5: Choose the correct academic phrase to complete: "The study ________ a causal link between exercise frequency and cognitive performance in older adults."
- Thought about
- Established (Correct answer)
- Talked about
- Looked at
Correct answer: Established
"Established" is the formal academic word meaning to prove or demonstrate something definitively. Academic studies "establish," "demonstrate," "reveal," or "confirm" findings. "Thought about," "talked about," and "looked at" are all informal and inappropriate for academic writing about research conclusions.
Question 6: Which sentence contains a word usage error typical of non-native English speakers?
- The professor emphasized the importance of critical thinking in academic settings.
- The research demonstrates a significant correlation between the two variables.
- The scientists made an experiment to test the hypothesis. (Correct answer)
- The author argues that environmental regulations benefit long-term economic growth.
Correct answer: The scientists made an experiment to test the hypothesis.
The error in Option C is "made an experiment"—the correct collocation in English is "conducted an experiment" or "performed an experiment." "Make" is not used with "experiment" in standard academic English. Non-native speakers often use "make" where "conduct," "perform," or "carry out" is required.
TOEFL Vocabulary & Word Usage 3
Which sentence uses the word "mitigate" correctly in an academic context?