Scientists are convinced___the positive effect of laughter ____physical and mental health.A.of,at B.of,on C.on ,at D.by,in

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Scientists are convinced___the positive effect of laughter ____physical and mental health.A.of,at B.of,on C.on ,at D.by,in
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Scientists are convinced___the positive effect of laughter ____physical and mental health.A.of,at B.of,on C.on ,at D.by,in
Scientists are convinced___the positive effect of laughter ____physical and mental health.
A.of,at B.of,on C.on ,at D.by,in

Scientists are convinced___the positive effect of laughter ____physical and mental health.A.of,at B.of,on C.on ,at D.by,in
选B.
be convinced of sth 意为 对某事确信
effect on sth 是 对某物产生的效果
句子的意思是:科学家确信笑会对人的身体和精神健康产生积极效果.

D

D

科学是可信服的
大笑的不良影响(表面意思是“消极影响”)
生理和心理健康(mental就是“精神上的”)