【題目】Some wild animals are in danger because the number of them smaller

and smaller.

A. become B. are becoming C. is becoming D. have become

【答案】C

【解析】

句意：一些野生動物瀕臨滅絕，因為他們的數(shù)量在變得越來越小。the number of ---的數(shù)字，做主語時，謂語動詞用單數(shù)形式；根據(jù)句意可知是正在變得越來越小，用現(xiàn)在進行時態(tài)；故選C

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