Why do some animals sleep in wintertime? What keep them live in winter?

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问题 Why do some animals sleep in wintertime?
What keep them live in winter?

选项 A、Food they store．
B、Their body fat.
C、The snow．

答案B

解析根据第二段最后一句可知它们靠身体中的脂肪来维持生命，所以答案为B。

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