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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:考查介詞。 be convinced of sth 意為“對某事確信”; effect on sth是“對某物產生的效果”。句意:科學家確信笑會對人的身體和精神健康產生積極效果。故C正確。

考點:考查介詞

 

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