Which sentence uses 'impact' correctly?

A. The vaccine impacts the immune system positively.

B. She wore a red impact to the party.

C. His speech had no impact on the audience.

D. The teacher impacted the students to study harder.

答案解析

**Core Concept**: Word usage (noun vs. verb). **Answer Analysis**: - **C. 'Had no impact'** correctly uses 'impact' as a noun meaning 'effect.' - **A** misuses 'impact' as a verb (correct verb: 'affects'). - **B** uses 'impact' as clothing (nonsensical). - **D** misapplies 'impact' as a synonym for 'urge.' **Common Mistake**: Confusing 'impact' (noun) with 'affect' (verb).

正确答案：C

Which sentence uses 'impact' correctly?

答案解析

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