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    【题目】 ______rise in carbon dioxide is causing _______ steady increase in global warming.

    A. The; a B.不填; a C. The;不填 D.A；the

    【答案】A

    【解析】

    试题分析：句意：二氧化碳增多正在导致全球持续变暖。第一空名词rise后面有介词短语in carbon dioxide修饰，说明该词表示特指，所以使用定冠词the；第二空使用a表示泛指。故A正确。

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