[题目]Scientists are convinced the positive effect of laughter physical and mental health.A. of; at B. of; on C. by; in D. on; at 题目和参考答案——青夏教育精英家教网—

题目内容

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

A. of; at B. of; on

C. by; in D. on; at

【答案】B

【解析】考查介词。be convinced of sth.指“对某事确信”；effect on sth.表示“对于……的影响”，用介词on。句意：科学家们坚信笑对身心健康有积极影响。故选B。

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