【題目】An ecosystem consists of the living and nonliving things in an area ________ interact with one another.
A.that
B.where
C.who
D.what

【答案】A
【解析】句意：一個生態(tài)系統(tǒng)由一個區(qū)域內(nèi)的可以相互作用的生物和非生物成的。根據(jù)句意可知，________ interact with one another是定語從句，修飾先行詞the living and nonliving things，故排除what,what不能用于定語從句。 在該定語從句中，interact 缺少主語，因此排除B項。That 既可以代指人，也可以代指物，who只能代指人，根據(jù)中的先行詞是the living and nonliving things 是既有人又有物，因此只能選擇A項。

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