题目内容
Warm??blooded animals live an active life even in freezing winter,which helps them to ________ their normal body temperature.
A. keep up B. build up C. bring up D. pick up
A
解析:
略
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题目内容
Warm??blooded animals live an active life even in freezing winter,which helps them to ________ their normal body temperature.
A. keep up B. build up C. bring up D. pick up
A
略