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】

試題分析：句意：一些人害怕全世界的空氣污染可能引起氣候的改變。分析：pollution為不可數(shù)名詞，air pollution為泛指，因此不用冠詞。因此選擇第二項(xiàng)。故選B

考點(diǎn)：考查冠詞的用法。

 

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