题目内容
【题目】Scientists are convinced ___ the positive effect of laughter ____ physical and mental health.
A.of; on B.by; in C.of; at D.on; at
【答案】A
【解析】
试题分析:考查介词搭配。句意为:科学家们相信笑对于身心健康有积极的影响。考查短语:be convinced of,意为相信…。以及短语:the effect on…,意为对…的影响。故选择A。
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