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
短语辨析。A. 保持；继续 B.增进 C.提出；教育 D.捡起。句意：温血动物甚至在寒冷的冬天也能生活的很活跃，这就保持了他们正常的体温。故选A。