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

A. of; at B. by; in C. of; on D. on; at

【答案】C

【解析】

試題分析：考查固定詞組。句意：科學(xué)家們相信微笑對于身體很精神健康都有積極的影響。固定詞組be convinced of相信…；have an effect on…對…有影響；故C正確。

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