大量氮、磷等植物营养元素进人水体后，营养物质过剩，藻类大量繁

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问题单项选择题

大量氮、磷等植物营养元素进人水体后，营养物质过剩，藻类大量繁殖，水质恶化，水生生物死亡，一般称为（）。

A.富营养化

B.湖泊酸化

C.有毒物质污染

D.湖泊氧化

答案

参考答案：A

解答题

36×（100+2）﹦36×100+2______．

选择题

— I had to take a taxi home yesterday because my car broke down.

— You ____. I was not using it.[ ]

A. could have borrowed mine.

B. couldn't have borrowed mine.

C. must have borrowed mine

D. shouldn't have borrowed mine