【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：考查介詞。本句第一空考查短語：be convinced of，意為確信、相信。第二空考查短語：the effects on。故選擇C，句意為：科學(xué)家相信笑對于人的身心健康有好處。

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