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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．on; atC．by; inD．of; on
    D

    试题分析：第一空考查短语be convinced of的用法，意为：相信。第二空on意为：在……方面。句意：科学家们相信笑对身体和精神健康有积极作用。
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