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    rise in carbon dioxide is causing    steady increase in global warming.

A.The; aB.不填; aC.The; 不填D.A;the

A

解析试题分析:考查冠词,the表示特指;a/an表示泛指,rise in carbon dioxide意思“二氧化碳的增加”,表示特指,所以用the,a steady increase意思“一种稳步增长”,表示泛指,所以用a,因为以辅音字母s开头,所以用a,句子意思“二氧化碳的增加导致了一种稳步增长在全球变暖”
考点:考查冠词
点评:冠词是常考内容,要知道它们表示的意思,the表示特指;a/an表示泛指,遇到冠词题时,就很容易做出选择

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