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    精英家教网 > 高中英语 > 题目详情

    Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
    A．of；at　　　B．by；inC．of；on　　　D．on；at
    C

    试题分析：考查固定词组。固定词组be convinced of相信…；have an effect on…对…有影响；句意：科学家们相信微笑对于身体很精神健康都有积极的影响。故C正确。
    点评：be convinced of相信…；have an effect on…对…有影响；对于形容词的短语搭配在平时的学习中也要注意识记和辨析。
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