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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 ;onB．by; inC．of ; atD．on ;at
    A
    考查固定短语。be convinced of确信; effect与介词on连用。句意：科学家相信笑对于身体和精神的积极影响。
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