【小站原创】官方真题Official6托福听力Lecture4文本+真题+答案解析

官方真题Official6托福听力Lecture4答案解析

Question 1 of 6

正确答案：A

题目解析：教授在第一段中提到 how they flow, and the way they flow needs some explaining.并在接下来的lecture中解释了这个问题。所以答案应选 A。

Question2 of 6

正确答案：ACE

题目解析：(原文) But the rock paintings aren‘t the only evidence. Beneath the Sahara are huge aquifers, basically a sea of fresh water, that’s perhaps a million years old filtered through rock layers. And…e r…and then there is fossilized pollen, from low shrubs and grasses that once grew in the Sahara.rock paintings aren’t the only evidence对应C, Beneath the Sahara are huge aquifers对应E, then there is fossilized pollen对应A。

Question 3 of 6

正确答案：BD

题目解析：(原文) Well, Now, we’re so used to hearing about how human activities are affecting the cli mate, right? But that takes the focus away from the natural variations in the earth climate, like the Ice Age, right? The planet was practically covered in ice just a few thousand years ago. Now as far as the Sahara goes, there is some recent literature that points to the migration of t he monsoon in that area. Well, the answer is: t he dynamics of earth’s motions, the same thing that caused the Ice Age by the way. 也就是 BD 选项。

Question 4 of 6

正确答案：B

题目解析：如果季风位移，那么导致雨水转移到其他地区，这也就是教授分析的为什么沙哈拉沙漠开始干旱的首要原因，也就是 B 选项。 D 是由于长期没有雨水而导致土地无法保持水土是接下来发生的事。C是由于变得drier从而使vegetation的数量减少。

Question 5 of 6

正确答案：C

题目解析：(原文) 5,000 years ago, Egypt really began to flourish out in the Nile River valley. And that’s not that far away. So it’s only logical to hypothesize that a lot of these people migrated to the Nile valley when they realized that t his was more than a temporary drought. And some people take this a step further. And t hat’s okay, that’s science and they hypothesize that this migration actually provided an important impetus in the development of ancient Egypt. Well, we’ll stay tuned on that. 教授说更多的证据还有待被发现，但是很多的巧合以及推测指出这样的可能性因此是 C。D 并没有具体指出如何才能完全证实这一理论，因为基本的证据都还缺乏。

Question 6 of 6

正确答案：D

题目解析：原文 “The Sahara was really different 6000 years ago. I mean, you wouldn't call it a tropical paradise or anything, or maybe you would if you think about how today in some parts of the Sahara, it only rains about once a centry” 可知是通过那句话突出对比撒哈拉沙漠气候变化的剧烈。

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