题目内容
A．Swimming in a lake.B．Washing clothes.C．Visiting his hometown.D．Sightseeing.
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听力原文：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!
(23)
Some oil escaped out to sea will finally break down and form. tar balls.
A．She worked on her term paper far into the night.B．She watched some sports game on TV
From the author's point of view, the best way to prevent oil spills is to get rid of oil completely.
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