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    【题目】Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.

    A. of; at B. of; on

    C. by; in D. on; at

    【答案】B

    【解析】考查介词。be convinced of sth.指“对某事确信”；effect on sth.表示“对于……的影响”，用介词on。 句意：科学家们坚信笑对身心健康有积极影响。故选B。

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