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 由于氣候的變化，北極熊賴以生存的冰面正在慢慢消失．

解答 答案：B．
首先確定句子的主語為the ice，是第三人稱單數(shù)，所以動(dòng)詞要用第三人稱單數(shù)形式，故選B．

點(diǎn)評 本題考查句子的時(shí)態(tài)，只要明確句子的主語，根據(jù)主語確定動(dòng)詞的形式，就很容易選出答案．

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