【題目】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】

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

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