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Scientists are convinced ______ the posi...

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

A. of;onB. by;in  C. of;at  D. on;at

 

A 【解析】 试题分析:考查介词搭配。短语be convinced of相信...;have an effect on对...有影响;句意:科学家们相信笑对身体和精神的积极影响。故A正确。 考点:考查介词搭配  
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