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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．by, inC．of, onD．on, at
    C

    试题分析：句意：科学家确信笑会对人的身体和精神健康产生积极效果。be convinced of sth 意为对某事确信；effect on sth. 是对某物产生的效果
    点评：解答此类题型要先理解题干要表达的意思，再分析各个选项中单词的词义，从中选取适合语境的一个。在平时的学习中，要重视对固定词组的总结、归纳和记忆。
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