Scientists are convinced _____the positive effect of laughter _____physical and - 高中英语试题 - 超级试练试题库

题目

题型：不详难度：来源：

Scientists are convinced _____the positive effect of laughter _____physical and mental health．

A．of ;at

B．by; in

C．of ; on

D．on ;at

答案

解析

考查介词。be convinced of相信，名词effect后接on，故选C。

核心考点

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