Scientists are convinced ________the positive effect of laughter________ physica
题型：不详难度：来源：
Scientists are convinced ________the positive effect of laughter________ physical and mental health.| A．of; at | B．of; on | C．by; in | D．on; at |
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答案
| B |
解析
| 考查介词辨析。be convinced of 相信… ; “对…有影响” 应用介词on。句意：科学家们相信笑声对身体和精神健康有积极地影响。故B正确。 |
举一反三
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