为了帮助同学们更加顺利备考：Lecture1题目+解析，希望可以给大家备考提供一些参考。预祝你们都可以取得好成绩。
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
解析：
C:What we call the active layer of permafrost,which melts in the summer and refreezes again in the winter.
D:There's been considerable research done to try to figure out what causes them to be shaped and oriented this way. What makes them grow this way?
从这些内容来看，整个Lecture都在围绕着融湖是如何形成的。并且文章中提出了两个不同的理论来论证。第一个理论将“分”作为融湖朝向的起因，而第二理论则认为是坍塌造成的。
2.The professor explains thaw lake formation as a cycle of events that occur repeatedly.Summarize this cycle, starting with the eventflled in below.
Drag your answer choices to spaces where they belong. To remove an answer choice, click on it
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
解析：
此题注意听时间词，以及时间之后所发生的事情。描述的是一个循环过程。
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
解析：
这里说了，protective shelf使得湖岸得到保护，将波浪转移到左右两边。
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
解析：
通过lecture可以知道，短的那边比较容易被融化，掉入湖中，所以答案是A
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
解析：
此句中我们可以判断出老师是不确定的态度,认为这个理论还没被很好地论证过。
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 important topic.
D.He wants to point out an important difference between frozen ground and dry ground.
答案：B
解析：
重听内容为 You ever see mud after it dries?举个例子帮助学生理解之前ice wedge 产生的情况