问题
选择题
Warmblooded 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
答案
答案：A
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Warmblooded 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
答案：A