单选题：Whatfunctiondoespolaranimals'wintercoatsoffurperforminpolara

题目分类：英语六级
题目类型：单选题
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Whatfunctiondoespolaranimals'wintercoatsoffurperforminpolarareas? A．Tokeepwarmairclosetothebody.
B．Toprotectthebodyfrombeinghurt.
C．Tostopthetransferofheat.
D．Tokeepthewarmairinsidethebody.

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