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:考查固定搭配。句意:科学家相信笑声对身心有积极的影响。be convinced +that从句/of sth相信......,effect与介词on搭配,意为“对某物/某事有影响”,故选C。
考点:考查固定搭配
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