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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; atB．of; onC．by; inD．on; at
    B
    考查介词辨析。be convinced of 相信… ; “对…有影响” 应用介词on。句意：科学家们相信笑声对身体和精神健康有积极地影响。故B正确。
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