Why do some animals sleep in wintertime? What does the word "hibernation" in the first paragraph mean?

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问题 Why do some animals sleep in wintertime?
What does the word "hibernation" in the first paragraph mean?

选项 A、睡眠
B、冬眠
C、迁徙

答案B

解析前边讲了动物们由于冬天冷很难找到食物而会睡很长时间，所以应是冬眠，答案为B。

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