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【题目】Did you know that the earth is home to animals?

A.million B.millions C.million ofD.millions of

【答案】D

【解析】

考查与数量有关的名词、代词和限定词。句意: 你知道地球是几百万动物的家园吗?millions of是固定搭配,“几百万的”;数词+million,表示具体的……百万,此时million是单数形式;空前没有具体数词,因此用millions of。故选D

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