【小站原创】官方真题Official9托福听力Lecture3文本+真题+答案解析

官方真题Official9托福听力Lecture3答案解析

Question 1 of 6

正确答案：D

题目解析：Student问：Why would lakes form in the desert? 接下来教授说：good question然后就开始长篇解答了。主要内容是湖怎样形成。

Question 2 of 6

正确答案：D

题目解析：教授认为其不完整，需要更多的 work.

Question 3 of 6

正确答案：B

题目解析：教授说formation有两个 fact。第二个fact: as you know, sand dunes contain other types of particles, besides sand, including clay and silt. 选择B。

Question 4 of 6

正确答案：AD

题目解析：文中提及的the location of the limestone formations和A选项对应;而后文一直都在对比新旧lake sites发现的化石种类的不同，对应选项D。Another difference, very important today for distinguishing between older lake beds and newer ones, is the location of the limestone formations.(A选项) Now, the older lakes, about half the formations, the ones that started forming 37000 years ago, the limestone formations we see, they're up to a kilometer long, but only a few meters wide, and they're scattered along the desert floor, in valleys between the dunes. So, the theory is, the lakes formed there on the desert floor, in these long narrow valleys. And we know, because of what we know about similar ancient desert lakes, we know that the lakes didn't last very long, from a few months to a few years on average. As for the more recent lakes, the ones from 10000 years ago, well, they seemed to have been smaller, and so may have dried up more quickly(D选项).

Question 5 of 6

正确答案：A

题目解析：和older lake相比，recent lake 只够动物喝水用，选择A。

Question 6 of 6

正确答案：C

题目解析：从Maybe开始引入教授猜测没有鱼化石的原因。

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