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Scientists are convinced--- the positive...

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】考查介词用法,convince sb of sth 意思“某人确信某事”on意思“关于”,根据句子意思,可知选C
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