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问题 单项选择题

工业废水常用的生物处理方法为（）。

A.活性污泥法

B.混凝沉淀法

C.离子交换法

D.生物滤池法

答案

参考答案：A

选择题

35. The national Education Department says school safety has set off alarm bells with frequent serious accidents_________students got injured or even killed.

A．that

B．in which

C．by which

D．When\
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选择题

Tom and I _____good friends. He _____twelve. [ ]

A. are, is      

B. am, is      

C. is, are        

D. are, are
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