Warm blooded animals live an active life even in freezing winter，which helps the

题干

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

上一题下一题 0.64难度单项选择更新时间:2016-06-27 04:30:14

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