题目内容：
Researches are convinced ______ the positive effect of laughter ______ physical and mental health.A．of; atB．by; inC．of; on D．at; on
参考答案：
单选题：Researches are convinced ______ the positive effect of laugh..
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It is important to learn to take a positive attitude_____ li..
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I don’t think it was an accident at all. Your brother did ..
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________ their son away to college, they got more room in th..
________ their son away to college, they got more room in the house.A．WithB．BecauseC．ForD．As