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    精英家教网 > 高中英语 > 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
    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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