(2007湖南,23)Polar bears live mostly on ______ sea ice, which they use as ______ platform for hunting seals.
A.a; aB.a; theC./; aD.the; /在线课程C
解析:
句意:北极熊主要生活在海冰上,它们把海冰当作捕捉海豹的平台。第一空sea ice是不可数名词,在本句中表泛指,故用零冠词。第二空应用不定冠词,指“用作一种平台”。
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