Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.A.of; at

题目简介

Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.A.of; at

题目详情

Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.
A.of; atB.by; inC.of; onD.on; at
题型:单选题难度:偏易来源:不详

答案

C
convince 意为“使确信,说服”,与介词of连用,意为“使(人)承认或信服”。effect 意为“作用,功效,影响”,与介词on连用,表示“对……有影响”。

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