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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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