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    【题目】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】

    试题分析：考查固定词组。句意：科学家们相信微笑对于身体很精神健康都有积极的影响。固定词组be convinced of相信…；have an effect on…对…有影响；故C正确。

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