Researches are convinced ______ the positive effect of laughter ______ physical and mental health.A.

题目简介

Researches are convinced ______ the positive effect of laughter ______ physical and mental health.A.

题目详情

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

答案

C

试题分析:考查介词:be convinced of相信…,第二空填on,effect on…对…的影响,句意:研究者相信,笑声对身体精神健康的积极影响。选C。
点评:本题考查了介词短语,在平时要加强识记和记忆。做题时要结合上下文判断。

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