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    精英家教网 > 高中英语 > 题目详情
    Scientists are convinced______ the positive effect of laughter______ physical and mental health.
    A．of ; atB．by ; inC．of ; onD．on ; at
    C
    考察介词。Be convinced of 为固定词组，意为对……信服  effect on sth 意为对……的影响 为固定短语 ，所以选择C
    句意为，科学家们对笑声对身心健康产生的影响深信不疑。
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