题目内容

Scientists are convinced ________ the positive effect of laughter _______ physical and mental health.

A. of; at B. by; in C. of; on D. on; at

C

【解析】

试题分析：句意：科学家们确信大笑在身体和心理健康方面的积极作用。A. of所属关系; at 在某地 B. by凭借; in在内部 C. of“的”; on 在某方面 D. on在某方面; at在某地。第一个空be convinced of 确信，第二个空“在某方面”。故选C。

考点：考查介词的用法。

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