三循供水对象包括（）、（）、（）及动力站。
参考答案：制冷站；余热回收站；空分空压
日常生活中，降低天然水硬度的简单方法是[ ]
A.过滤
B.吸附
C.消毒
D.煮沸
–There is thick haze(雾霾)around many cities in China recently. What do you think of it ?
---I think __________ cars we drive, the less pollution the city has.
A．the less
B．the fewer
C．the more
D．tyhe faster
