Day2| 7天听力讲座营 – 地质学话题



1. What is the main purpose of the lecture?

  • A. To contrast how different kinds of thaw lakes grow
  • B. To explain why a new theory of thaw lakes is gaining acceptance
  • C. To explain how processes in permafrost lead to the formation of thaw lakes
  • D. To describe two competing theories about the growth of thaw lakes

2. The professor explains thaw lake formation as a cycle of events that occur repeatedly.
[Summarize this cycle, and put them in order.]

  • A.Meltwater flows into cracks in permafrost
  • B.Ice wedges inside permafrost completely melt
  • C.Freezing water expands cracks in permafrost
  • D.Ice in the active layer melts as temperatures rise
  • E.Permafrost shrinks and cracks as temperatures drop

3. What is the significance of the “protective shelf” discussed by the professor?

  • A. It prevents the slumping of lake banks.
  • B. It shields the lake surface from strong winds.
  • C. It redirects the waves to lake banks that do not face the wind.
  • D. It allows the lakes to grow in the same direction as the wind blows.

4. According to the thaw slumping model, which side of a thaw lake grows fastest?

  • A. The side where the bank is shortest
  • B. The side least exposed to wind
  • C. The side that is at the highest elevation
  • D. The side opposite the protective shelf

5. What is the professor’s opinion of the thaw slumping model?

  • A. He thinks it was urgently needed.
  • B. He is not convinced that it has a firm basis.
  • C. He thinks it would be better if it were simplified.
  • D. He does not think it is very different from the old model.

6. Why does the professor say this: 🎧

  • A. He wants some information from the students.
  • B. He thinks that the students may find an example helpful.
  • C. He realizes that he forgot to mention an important topic.
  • D. He wants to point out an important difference between frozen ground and dry ground.







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