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【题目】The Earth is ________only home for mankind. We must protect________planet as we protect our own eyes.

A.an; theB.an; aC.the; aD.the; the

【答案】D

【解析】

句意:地球是人类唯一的家园。我们必须像保护自己的眼睛一样保护这个行星。

考查冠词,定冠词the一般表特指,不定冠词a/an一般表泛指,单词开头是以元音音素发音时用an。第一空是特指人类唯一的家园,应该用the;第二空指代上文提到的earth,应该用定冠词the,故选D

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