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【题目】Scientists are convinced _________ the positive effect of laughter ________ physical and mental health.

A. of; at B. by; in

C. of; on D. on ; at

【答案】C

【解析】be convinced of确信; effect on…对 ... 的作用。句意:科学家们相信笑身心健康积极作用根据句意选C。

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