Warm­blooded animals live an active life even in freezing winter，which helps them to ________ their normal body temperature.
A．keep upB．build upC．bring upD．pick up
A
短語辨析。A. 保持；繼續(xù) B.增進(jìn)  C.提出；教育    D.撿起。句意：溫血動物甚至在寒冷的冬天也能生活的很活躍，這就保持了他們正常的體溫。故選A。
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