Question

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

Answer 1

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。