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[TPO听力] TPO49托福听力Lecture 1题目文本+答案分享

 
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Lecture1 (Alaska)
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
答案:CD
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2.The professor explains thaw lake formation as a cycle of events that occur repeatedly.Summarize this cycle, starting with the eventflled in below.
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Answer Choices
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..
答案:EDACB
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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.
答案:C
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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
答案:A
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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.
答案:B
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6. Replay: 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 im