The scientists are studying the effects of human activities______the environment
题型：不详难度：来源：
| The scientists are studying the effects of human activities______the environment. |
答案
| C |
解析
| 此处所填的介词与effects搭配, 对……的有影响, 用 effect on/upon表示。我们也可以联想所学短语 have an effect on sth。 |
举一反三
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