Warm blooded animals live an active life even in freezing winter，which helps them to ______ their normal body temperatu

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1. (2017高二下·南昌期中) 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

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2015-2016学年江西南昌市二中高二下期中考试英语试卷