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

A. of；onB. by；in C. of；at D. on；at

【答案】A

【解析】

試題分析：考查介詞搭配。短語be convinced of相信...；have an effect on對...有影響；句意：科學(xué)家們相信笑對身體和精神的積極影響。故A正確。

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