Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
A．of；at　　　B．by；inC．of；on　　　D．on；at
C

試題分析：考查固定詞組。固定詞組be convinced of相信…；have an effect on…對(duì)…有影響；句意：科學(xué)家們相信微笑對(duì)于身體很精神健康都有積極的影響。故C正確。
點(diǎn)評(píng)：be convinced of相信…；have an effect on…對(duì)…有影響；對(duì)于形容詞的短語搭配在平時(shí)的學(xué)習(xí)中也要注意識(shí)記和辨析。
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