Scientists are convinced ___ the positive effect of laughter ____ physical and mental health.

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

A

【解析】

試題分析:考查介詞搭配。句意為:科學(xué)家們相信笑對于身心健康有積極的影響。考查短語:be convinced of,意為相信…。以及短語:the effect on…,意為對…的影響。故選擇A。

考點:考查介詞搭配

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