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

A.in; onB.of; onC.on; atD.in; at

【答案】B

【解析】

考查介词。句意:科学家们确信笑对身心健康有积极的影响。be convinced of是固定句式,意为相信……”effect经常和on搭配,表示……的影响。故选B

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