『新东方在线托福听力』为托福考生准备了ETS托福TPO/Official 24 Con 2听力练习：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.原文题目答案解析，TPO/Official 24 Con 2听力原文范文音频翻译。

托福TPO/Official 24 Con 2听力原文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.-新东方托福官方网校手机版

旁白：请听一段学生与他的地理教授之间的对话。

Narrator: Listen to a conversation between a student and his geography professor.

教授：你好，保罗。你需要我的帮助吗？

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

学生：我有个关于期末考试的问题。

Student: I have a question about the final exam.

我是说，考试的内容包括我们这学期所有的知识吗？

I mean, will it cover everything we've done all term?

还是期中考试以后我们学的知识？

Or just what we've been doing since the mid-term exam.

教授：我们这个学期学的所有的知识。

Professor: Everything we've done all term.

有关水循环的问题我还不是很清楚，嗯，就是水在地球和大气之间的循环。

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.

在期中考试的时候我这个问题就回答的一塌糊涂，

I really blew the question about it on the mid-term exam.

我希望在期末考试中能答好这个问题。

教授：这样啊，你去过辅导中心吗？

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

学生：没有，没去过地理课的辅导中心。

那里不是只有当你写论文或研究报告的时候需要帮助的时候才能去吗？

Isn't that just for when you need help with writing, like an essay or a research paper?

you can get tutoring in a lot of subjects.

有许多地理系的研究生会在那里给大家辅导。

Some graduate students from this department tutor there.

但是我很少去那里因为我要做兼职。

But I hardly go there because I have a part-time job.

I never seem to be free when they are open.

教授：哦，期末考试的时候他们会延长辅导的时间。

Professor: Well, they will be extending their hours when final exams begin.

但是，嗯……既然你已经来了，我可以帮你看一下，哪里不会？

But um... Well, since you are here now, can I help you with something?

我记得课堂上我们讲过一个图表。

I remember we went over a diagram in class.

根据我的记忆，水是来回循环的，湖水和海水变成水蒸气，然后水蒸气又变成雨或雪落下，也就是降水。

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.

它们不断的通过蒸发和液化循环。

It's constantly being recycled through evaporation and condensation.

嗯……那你到底那里不明白呢。

Um... so exactly what is it you don't understand?

学生：我想我感到困惑的是地形是如何影响降水的，比如说山脉和峡谷或者是其它的地形。

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.

Precipitation is influenced by topography among other things.

Um, why don't we talk about lake-effect snow?

这种现象发生在面积大的不结冰的湖区，湖区的上空有冷空气，而这种现象多在北半球出现。

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?

教授：是的。冬天北极地区的冷空气会从北边吹来。

Professor: Yes. What happens is that the cold arctic air blows across the lake from the north in winter.

当冷空气穿过湖区时，低处的空气层会因湖水的温度而变暖，湖水比北极的冷空气要热的多。

And as the air crosses the lake, the lower layer is warmed by the lake water, which is much warmer than the arctic air.

由于空气变暖湿度增加，与上层的空气相比它会变轻。

And as this layer is warmed and picks up moisture, it becomes lighter than the air above it.

学生：所以它就会上升，对吗？

教授：是的。所以会形成云层。

Professor: Yes. And clouds begin to form.

当空气到达湖的边缘时，由于陆地的原因它的速度会减慢并不断聚集。

When the air gets close to the shore, it's slowed down by the land and starts to pile up.

所以它上升的更快，又无法到别的地方去，这就是地形造成的。

So it rises even faster because it has nowhere else to go, that's where topography comes into the picture.

学生：所以接着就会下雪，因为随着空气的上升，温度降低，从而失去了对水蒸气的控制。

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

学生：好的，谢谢您。考试的时候您会出这道题吗？

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

但是就算出了你也没有问题了。

Why does the student go to speak with the professor?

What does the professor tell the student about the tutoring center?

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

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.

Listen again to part of the conversation.Then answer the question Why does the professor say this:

Narrator: Listen to a conversation between a student and his 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. 
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.