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Scientists are convinced ________the pos...

Scientists are convinced ________the positive effect of laughter________ physical and mental          health.

A.of; at

B.of; in

C.by; in

D.on; at

 

B 【解析】考查介词辨析。be convinced of 相信… ; “对…有影响” 应用介词on。故B正确。
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