Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.
A．of; atB．on; atC．by; inD．of; on
D

試題分析：第一空考查短語be convinced of的用法，意為：相信。第二空on意為：在……方面。句意：科學(xué)家們相信笑對身體和精神健康有積極作用。
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