题目内容
3.Scientists are convinced ________ the positive effect of laughter _______ physical and mental health.( )A. | of; at | B. | by; in | C. | of; on | D. | on; at |
分析 科学家确信笑会对人的身体和精神健康产生积极效果.
解答 答案C
根据句意,第一个空考查固定短语be convinced of,意为"对…确信";第二空考查短语effect on"对…产生影响".
点评 本题考查介词,考生需牢记带介词的固定短语搭配.

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