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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為表泛指的物質名詞,故其前不用冠詞; 第二空后的為表泛指的單數可數名詞,故其前用不定冠詞。

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