Scientists are convinced _____the positive effect of laughter _____physical and
题型：不详难度：来源：
Scientists are convinced _____the positive effect of laughter _____physical and mental health．| A．of ;on | B．by; in | C．of ; at | D．on ;at |
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答案
| A |
解析
| 考查固定短语。be convinced of确信; effect与介词on连用。句意：科学家相信笑对于身体和精神的积极影响。 |
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