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A．By bringing an animal rarely seen on nearby farms.B．By bringing a bag of grain in ex
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Section A
Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.
(12)
A．Swimming in a lake.B．Washing clothes.C．Visiting his hometown.D．Sightseeing.
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.
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