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OFFICIAL24 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. [Click in the correct boxes.]

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[00:00.00]NARRATOR: Listen to a conversation between a student and his geography professor. [00:04.92]MALE STUDENT: Hi. Professor Brown.
[00:12.25]FEMALE PROFESSOR: Hi. Paul. What can I do for you?
[00:13.94]MALE STUDENT: I have a question about the final exam. [00:15.87]I mean, will it cover everything we've done all term? [00:18.76]Or just what we've been doing since the mid-term exam.
[00:21.70]FEMALE PROFESSOR:Professor: Everything we've done all term.[00:23.31]MALE STUDENT: Oh, boy. [00:24.45]You know, I'm still not too clear about the hydrologic cycle, um ...the transfer of water back and forth between the Earth and the atmosphere ...[00:33.56]I really blew the question about it on the midterm exam. [00:36.72]I wanna do better on the final exam, [00:39.10] but I'm still having trouble with it.
[00:40.71]FEMALE PROFESSOR: Well—um, have you been to the tutoring center?[00:43.79]MALE STUDENT: No, not for geography anyway. [00:46.10]Isn't that just for when you need help with writing ...like an essay or a research paper?[00:50.80]FEMALE PROFESSOR: Oh, no. [00:51.52]You can get tutoring in a lot of subjects. [00:53.83]Some graduate students from this department tutor there.[00:56.89]MALE STUDENT: Um, that's good to know, [00:58.35] but I hardly go there because I have a part-time job. [01:01.04]I never seem to be free when they're open.
[01:03.20]FEMALE PROFESSOR: Well, they'll be extending their hours when final exams begin?[01:06.47]you might try then. [01:07.58]But...since you're here now, can I help you with something?
[01:11.80]MALE STUDENT: Well, the hydrologic cycle ...[01:14.32]I remember we went over a diagram in class ?[01:17.85]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. [01:29.21]It's constantly being recycled, through evaporation and condensation.
[01:33.40]FEMALE PROFESSOR: That's it, basically. [01:35.33] Umm ?so exactly what is it you don't understand?[01:39.55]MALE STUDENT: OK. I guess what I'm really confused about is how the topography of the land—the mountains and valleys and stuff—affect precipitation.[01:47.60]FEMALE PROFESSOR:OK, good question...[01:49.41]Precipitation is influenced by topography, among other things. [01:54.18]Uhh, why don't we talk about lake-effect snow... [01:58.00]It's a phenomenon that occurs anywhere you have a large lake that doesn't freeze, and has cold air flowing over it. Mostly in the Northern Hemisphere.
[02:06.38]MALE STUDENT: Like the Great Lakes in the United States?[02:08.61]FEMALE PROFESSOR: Yes. What happens is that the cold, arctic air blows across the lake from the north in winter, [02:14.93]and as the air crosses the lake, the lower layer is warmed by the lake water, which is much warmer than the arctic air. [02:22.07] And as this layer is warmed and picks up moisture, it becomes lighter than the air above it...
[02:27.92]MALE STUDENT: So it starts to rise, right?
[02:29.79]FEMALE PROFESSOR: Yes. And clouds begin to form. [02:32.89]When the air gets close to the shore, it's slowed down by the land, and starts to pile up. [02:38.94]So it rises even faster, because it has nowhere else to go. That's where topography comes into the picture.
[02:45.74]MALE STUDENT: And then it snows because as the air rises, it cools off and loses its capacity to hold water vapor.[02:52.67]FEMALE PROFESSOR: That's right.
[02:53.83]MALE STUDENT: OK. Thanks. Any chance you'll have this question on the final?
[02:57.55]FEMALE PROFESSOR: I don't know yet... [02:59.53]But you seem to have a handle on it.

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. [Click in the correct boxes.]
 
YES
NO
Arctic air blows across a lake and picks up moisture.
Cold air temperatures cause lake water to freeze.
Frozen lake water cools the air above it.
Water vapor condenses and becomes snow.
Warm air rises when it reaches the shore.
你的答案:
正确答案:ABBAA
题目解析:
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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. 从原文What happens is that the cold arctic air blows across the lake from the north in winter推断出选项A是正确答案;And clouds begin to form,推断出D是正确答案;When the air gets closer to the shore, it's slowed down by the land and starts to pile up,对应选项E;And then it snows because as the air rises, it cools off and loses its capacity to hold water vapor的描述说明B选项是错的。

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