-You look so worried, what’s wrong? -More and more people like me begin to worry about the

-You look so worried, what’s wrong? -More and more people like me begin to worry about the pollution after the haze (雾霾) appeared in Beijing and some other cities in China.
A. water
B. air
C. noise
D. Soil

A. water(答案→)B. airC. noiseD. Soil解析：water 水 ; air 空气 ;noise噪音 ;Soil土地,土壤.句意 :你看起来很担心,怎么了 ?——在北京和中国其他城市出现雾霾以后，越来越多的人开始担心空气污染。结合语境可知选B。

这下我知道了