Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.

A. of; at B. by; in

C. of; on D. on; at

 

C

【解析】

試題分析：考查固定搭配。句意：科學(xué)家相信笑聲對(duì)身心有積極的影響。be convinced +that從句/of sth相信......，effect與介詞on搭配，意為“對(duì)某物/某事有影響”，故選C。

考點(diǎn)：考查固定搭配

 

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