— The floor is dirty. Can anyone clean it?

— _______ I do it all the time. [ ]

A. Don't mention it.

B. Why you?

C. Not sure

D. Not me again.

为了经济的可持续发展，我们必须保护水资源，下列做法中错误的是

A．生活污水任意排放

B．工业废水经过处理后再排放

C．农业上合理使用农药和化肥

D．应用新技术、新工艺减少污染物的产生