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Scientists are convinced _____ the posit...

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

A.of; at             B.by; in             C.of; on            D.on; at

 

C 【解析】 试题分析:考察介词固定搭配。固定搭配:be convinced of…相信…;第二空使用介词on与前面的名词effect连用,表示对…的影响。句意:科学家相信笑对身体和精神健康的积极影响。故C正确。 考点:考察固定搭配
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