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[originaltext]M: I haven’t seen you for a while. Have you been away?W: Yes, I
[originaltext]M: I haven’t seen you for a while. Have you been away?W: Yes, I
游客
2023-08-02
45
管理
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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