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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：考查介词。本句第一空考查短语：be convinced of，意为确信、相信。第二空考查短语：the effects on。故选择C，句意为：科学家相信笑对于人的身心健康有好处。

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