【題目】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】考查介詞。be convinced of sth.指“對某事確信”；effect on sth.表示“對于……的影響”，用介詞on。 句意：科學(xué)家們堅信笑對身心健康有積極影響。故選B。

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