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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.不填; a D.the; 不填 

C

解析第一空后的sea ice为表泛指的物质名词,故其前不用冠词; 第二空后的为表泛指的单数可数名词,故其前用不定冠词。

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