Scientists are convinced ___ the positive effect of laughter ___ physical and me
题型：不详难度：来源：
Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.| A．of; at | B．by; in | C．of; on | D．on; at |
|
答案
| C |
解析
| convince 意为“使确信，说服”，与介词of连用，意为“使(人)承认或信服”。effect 意为“作用，功效，影响”，与介词on连用，表示“对……有影响”。 |
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