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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】

試題分析:句意:科學家們確信大笑在身體和心理健康方面的積極作用。A. of所屬關系; at 在某地 B. by憑借; in在內部 C. of“的”; on 在某方面 D. on在某方面; at在某地。第一個空be convinced of 確信,第二個空“在某方面”。故選C。

考點:考查介詞的用法。

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