题干
-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
答案(点此获取答案解析）
B
图象如图，则函数
的单调递增区间为（ ）
