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1.Because of climate change,the ice that polar bears depend on for survival        .(  )
A.are slowly disappearingB.is slowly disappearing
C.are slowly disappearedD.have slowly disappeared

分析 由于气候的变化,北极熊赖以生存的冰面正在慢慢消失.

解答 答案:B.
首先确定句子的主语为the ice,是第三人称单数,所以动词要用第三人称单数形式,故选B.

点评 本题考查句子的时态,只要明确句子的主语,根据主语确定动词的形式,就很容易选出答案.

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