9. The use of asbestos in some buildings _______________a threat to the health of the staff. Therefore, such areas must be closed down.

Question

BlackTom AI · Accepted Answer

The verb that fits grammatically and semantically is "poses" because it forms the common collocation "pose a threat."

1) Relevant knowledge points and concepts
- Collocations: "pose a threat" (or "pose a risk") is the standard English phrase meaning "to create or present a danger."
- Subject–verb agreement: "The use of asbestos" is a singular noun phrase, so the verb must be third-person singular present (poses, not pose).
- Verb meanings: know the meanings of the distractors (levy, violate, erode).

2) Step-by-step reasoning
- Insert each option into the sentence and check meaning and grammar:
  a. Levies: "The use of asbestos levies a threat…" — levy usually means "impose (a tax, fine, or duty)". It is not used with "threat" and is semantically wrong.
  b. Violates: "The use of asbestos violates a threat…" — violate is transitive with laws, rights, rules, or agreements; you do not "violate a threat." Incorrect meaning.
  c. Poses: "The use of asbestos poses a threat to the health of the staff." — This matches the idiom and clearly means the asbestos creates/presents a danger. Grammatically correct: singular subject -> "poses."
  d. Erodes: "The use of asbestos erodes a threat…" — erode means "wear away" and cannot sensibly take "a threat" as its object here.

3) Intermediate grammar/calculation step
- Subject: "The use of asbestos" (singular) → verb must be third-person singular present.
- Correct conjugation: pose → poses.

4) Why the correct answer is correct
- "Poses a threat" is the established expression meaning "constitutes a danger," exactly what the sentence conveys. It fits both meaning and grammatical form.

5) Why other options are incorrect (brief)
- Levies: wrong meaning (tax/charge).
- Violates: wrong collocation/meaning (used with laws/rights).
- Erodes: wrong meaning (wears away), does not collocate with "a threat."

Conclusion: The correct answer is c. Poses, which matches the provided answer.

9. The use of asbestos in some buildings _______________a threat to the health of the staff. Therefore, such areas must be closed down.单项选择题

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