Polar bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.
A．a(chǎn); aB．a(chǎn); theC．不填; aD．the; 不填
C
第一空后的sea ice為表泛指的物質(zhì)名詞，故其前不用冠詞; 第二空后的為表泛指的單數(shù)可數(shù)名詞，故其前用不定冠詞。
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