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[托福听力资料] 21天搞定托福听力音频,想提分的看过来

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发表于 2019-1-3 23:12:42 | 显示全部楼层
  A: Dr. Smith. I need to ask you about something in Chapter 12. Well it talks about erosion and the deposit of sediment on the deep sea floor, but I'm confused, cause, well, for that to happen there would have to be some kind of force down there moving the mud or sand or whatever, right? But I thought there weren't any waves or currents that deep in the ocean.
  B: That's not exactly correct. It's true that deep down on the ocean floor we won't have the same kinds of currents we find in shallower parts. But we do find what we call turbidity currents(混浊流). This wasn’t in the book but the term came up in class. Do you remember what it means?
  A: Um, turbidity currents? Oh, yeah! Isn't that when sediment like sand or mud gets stirred up and mixes with water,and then this mixer kind of flows through the water around it, right?
  B: Good!
  A: Um, but I thought that only happened in rivers.
  B: Well, yes. This does occur in rivers, but we see turbidity currents deep in the ocean as well. A: But how do they get started there?
  B: Earthquakes mostly, when an earthquake occurs under water, it throws up tremendous amounts of mud or sand that becomes suspended in a layer of water near the bottom of the ocean. This layer is so much denser and heavier than other ocean water that if flows right down the slopes of the ocean floor and gains more and more speed as it moves along. Then it's just like the winds blowing across the desert, picking up sand from one place and moving it along and finally dropping it somewhere else.
  31:What is the main topic of the discussion? (B) The movement of sediment deep in the ocean.
  32:What does the professor ask the student to explain? (D) What a turbidity current is.
  33:How is a turbidity current different from the water around it? (B) it's heavier.
  34:According to the professor, how do earthquakes cause turbidity currents? (C) By causing mud or sand to mix with ocean water
  35:Why does the professor mention desert winds? (C) To explain the effects of turbidity currents.

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发表于 2019-1-9 10:51:53 | 显示全部楼层
谢谢分享
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发表于 2019-2-5 13:34:42 来自手机 | 显示全部楼层
感谢分享
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发表于 2019-2-6 15:20:35 | 显示全部楼层
赞~~~~~~~~~~
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发表于 2019-4-21 23:27:45 来自手机 | 显示全部楼层
希望下载音频
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发表于 2019-5-9 09:58:41 | 显示全部楼层
一直在找一直在等待
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发表于 2019-5-9 17:27:35 | 显示全部楼层
多谢楼主
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发表于 2019-6-20 21:42:56 | 显示全部楼层
凄凄切切凄凄切切次
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发表于 2019-7-1 17:19:21 | 显示全部楼层
谢谢楼主!!!!!
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发表于 2019-8-1 13:22:32 | 显示全部楼层
希望希望
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