A、Too much algae. B、Excessive recreational use. C、Lack of adequate rainfall. D、Too much evaporation. AWhat has been the major pr

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问题  
M: I haven’t seen you for a while. Have you been away?
W: Yes, I just got back from vacation. I took a tour around the Great Lakes.
M: Was that an exciting experience?
W: Sure. Have you ever been there?
M: Oh, yes! When I was young I lived in Erie county in New York and I used to go swimming in Lake Erie all the time. We also went to Lake Ontario in Canada.
W: But I heard that Lake Erie was so polluted that almost everything living in it had died.
M: At one time Lake Erie was almost dead. There was so much algae that the oxygen supply was practically used up.
W: What on earth caused algae to grow so much?
M: It was the amount of phosphate detergents that caused the excessive growth of algae.
W: Oh, I think it’s the time that we limit the use of phosphate detergents.
M: Yes, and both U.S. and Canada now have legally limited the use of phosphate detergents, there have been tremendous gains in the fight against water pollution.
W: That’s good.
M: In fact all the Great Lakes will be ninety percent improved within the next generation.
W: I’m glad to hear an environmental success story at last!

选项 A、Too much algae.
B、Excessive recreational use.
C、Lack of adequate rainfall.
D、Too much evaporation.

答案A

解析 What has been the major problem in the Great lakes in recent years?
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