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    Polar bears live mostly on_____ sea ice, which they use as ____platform for hunting seals.

    A.     a;a  B.a;the  C./;a  D.the;/

    C


    解析:

    本题考查冠词。on_____ sea ice处是不可数名词，表示泛指，不加冠词；as____platform处表示数量，相当于one。

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