Scientists are convinced ___________the positive effect of laughter_________ physical andmental health.[ ]A. of;atB. by;inC.of;on D. on;at-高中英语-n多题

◎ 题干

Scientists are convinced ___________the positive effect of laughter_________ physical and
mental health.

[ ]

A. of;at
B. by;in
C.of;on
D. on;at

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◎ 解析

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◎ 知识点

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