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题目
题型:不详难度:来源:
Scientists are convinced_____the positive effect of laughter_____physical and mental health.     
A.of; atB.by; inC.of; onD.on;at

答案
C
解析
be convinced of确认,认识到;the effect on对……的影响。
核心考点
试题【Scientists are convinced_____the positive effect of laughter_____physical and me】;主要考察你对介词和介词短语等知识点的理解。[详细]
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A.inB.atC.ofD.about

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