Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.A．of；atB．by；inC．of；onD．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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