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12._____ birds fly to the south to spend their winter every year.(  )
A.Hundreds ofB.Millions ofC.Half of

分析 每年,数以百万计的鸟飞到南方过冬.

解答 答案:B.根据题干,本句的意思是每年,数以百万计的鸟飞到南方过冬.hundreds of"数以百计的",millions of"数以百万计的",half of"一半的".根据常识可知,hundreds of表示的数量过少;而half of表示的数量过于精确.故选B.

点评 在做本题是主要应根据常识进行选择,不能单纯用法选择.

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