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Some people are afraid that ______ air pollution may cause changes in weather around the world.

A. aB. 不填C. anD. the

 

B

【解析】

试题分析:句意:一些人害怕全世界的空气污染可能引起气候的改变。分析:pollution为不可数名词,air pollution为泛指,因此不用冠词。因此选择第二项。故选B

考点:考查冠词的用法。

 

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