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Scientists are convinced______ the positive effect of laughter______ physical and mental health.

A．of ; at

B．by ; in

C．of ; on

D．on ; at

考察介詞。Be convinced of 為固定詞組，意為對……信服 effect on sth 意為對……的影響為固定短語，所以選擇C
句意為，科學家們對笑聲對身心健康產生的影響深信不疑。

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