Air pollution is obviously one of the major______of city life.

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问题 Air pollution is obviously one of the major______of city life.

选项 A、references
B、disadvantages
C、definitions
D、expressions

答案B

解析 reference：涉及；disadvantage：不利条件，缺点；definition：定义；expression：表达。根据句意可知，选B。

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