The scientists are studying the effects of human activities______the environment.
A．inB．a(chǎn)tC．onD．with
C
此處所填的介詞與effects搭配, 對(duì)……的有影響, 用 effect on/upon表示。我們也可以聯(lián)想所學(xué)短語 have an effect on sth。
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