托福模拟试题听力 - TPO24 - 对话2

时间 : 2013-10-30 08:54来源 : VOA官网 收听下载次数 :
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TPO 24 Conversation 2一Student & Geography Professor

Student:Hi. Professor Brown.

Professor:Hi. Paul. What can I do for you?

Student:I have a question about the final exam. I mean, will it cover everything we've done all term? Or just what we've been doing since the mid-term exam.

Professor:Everything we've done all term.

Student:Oh, boy. You know, I am still not too clear about the hydrologic cycle, um, the transfer of water back and forth between the earth and the atmosphere. I really blew the question about it on the mid-term exam. I want to do better on the final exam. But I am still having trouble with it.

Professor:Well, uh, have you been to the tutoring center?

Student:No, not for geography anyway. Isn't that just for when you need help with writing, like an essay or a research paper.

Professor:Oh, no. you can get tutoring in a lot of subjects. Some graduate students from this department tutor there.

Student:That's good to know. But I hardly go there because I have a part-time job. I never seem to be free when they are open

Professor:Well, they will be extending their hours when final exams begin. You might try then. But um... Well, since you are here now, can I help you with something?

Student:Well, the hydrologic cycle. I remember we went over a diagram in class. And from what I remember, water changes back and forth from water in lakes and oceans to vapor, and then back to water again when it falls as rain or snow, as precipitation. It's constantly being recycled through evaporation and condensation.

Professor:That's it. Basically. Um... so exactly what is it you don't understand?

Student:OK. I guess what I am really confused about is how the topography of the land, the mountains and valleys and stuff, affects precipitation.

Professor:OK. Good question. Precipitation is influenced by topography among other things. Um, why don't we talk about lake-effect snow? It's a phenomenon that occurs anywhere you have a large lake that doesn't freeze and have cold air flowing over it, mostly in the Northern Hemisphere

Student:Like the great lakes in the United States?

Professor:Yeah. What happens is that the cold arctic air blows across the lake from the north in winter. And as the air crosses the lake, the lower layer is warmed by the lake water, which is much warmer than the arctic air. And as this air is warmed and picks up moisture, it becomes lighter than the air above it.

Student:So it starts to rise, right?

Professor:Yes. And clouds begin to form. When the air gets closer to the shore, it's slowed down by the land and starts to pile up. So it rises even faster because it has nowhere else to go, that's where topography comes into the picture.

Student:And then it snows because as the air rises, it cools off and loses its capacity to hold water vapor.

Professor:That's right.

Student:OK. Thanks. Any chance you'll have this question on the final?

Professor:I don't know yet. But you seem to have a handle on it.

 

1  Why does the student go to speak with the professor?

A. To discuss material that might be on the final exam

B. To review his answers to the midterm exam

C. To get information about a class he missed

D. To find out about the services of the tutoring center 

 

2 What does the professor tell the student about the tutoring center? Click on 2 answers

A. It will have extended hours dying the final-exam period.

B. It is located in a building near where he works

C. He can improve his writing skills there.

D. He can get help with geography there.



3  What aspect of the hydrologic cycle is the student confused about?

A. How the process of evaporation works

B. How topographical features affect precipitation

C. How water vapor in the atmosphere becomes rain

D. How lake water fits into the cycle



4  In the conversation, the professor describes the process that causes lake-effect snowstorms. Indicate whether each of the following is a step in the process

A.Arctic air blows across a lake and picks up moisture

B. Cold air temperatures cause lake water to freeze

C. Frozen lake water cools me air above it

D. Water vapor condenses and becomes snow

E. Warm air rises when it reaches the shore



5 Why does the professor say this: [that's where topography comes into the picture]

A. To make sure the student knows he will have to be familiar with topographical features for the final exam

B. To remind the student of a diagram that she presented in class

C. To point out the severity of weather conditions near the lakeshore

D. To reinforce the connection between her example and the student s question