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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

     

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    Warm­blooded animals live an active life even in freezing winter，which helps them to ________ their normal body temperature.


    1. A.
      keep up
    2. B.
      build up
    3. C.
      bring up
    4. D.
      pick up

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    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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    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

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    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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