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Scientists are convinced _______ the pos...

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

A.in; on B.of; on C.on; at D.in; at

 

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“对……的影响”。故选B。  
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