TPO44托福听力真题解析：Lecture 4

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TPO44托福听力解析：Lecture 4

 1. What is the main purpose of the talk?

A. To explain the mechanical functioning of barrages.
B. To discuss some possible ecological effects of building barrages.
C. To discuss the effects of ocean tides on coastal ecosystems.
D. To describe ways to increase biological productivity of estuaries.

解析：教授一直在讨论建造拦河坝对生态的影响。选B

2. What is the professor's opinion when the man expresses concern about marine life on the mud flats?

A. She thinks the environmental impact of barrages would be worse for birds than for fish.
B. She agrees that any damage to the mud flats would probably be irreversible.
C. She feels that the situation is more complex than the man realizes.
D.  She does not believe that the mud flats support a wide variety of animal species.

解析：学生问mud flat上面的生物会怎样被barrage影响，教授回答说你是不是觉得那些生物会受不良影响？考虑一下以下因素：通常河底的沉积物都会被潮汐造成的乱流搅动，造成水比较浑浊，而建造了拦河坝以后潮汐乱流不会搅动起沉积物，阳光可以照射进去，导致更多的食物可以被产生，吸引来其他生物。即实际情况不想学生想得那么简单，选C。

3. The professor mentions a change in the quantity of fish caught near a barrage in France. What most likely happened to the water in the estuary as a result of the construction of the barrage?

A. The water has become clearer.
B. The water has become saltier.
C. The water has become polluted
D. The water level has risen.

解析：同上解析，答案A。

4. What does the professor say is a criticism of the proposed barrage at the Severn River in Great Britain?

A. It would damage nearby buildings.
B. It would attract harmful species to the region.
C. It would not be as large as the barrage in France.
D. it would be too expensive to build.

解析：选D

5. Why does the professor say this:

A. To request that the student answer in greater detail.
B. To introduce a new topic for discussion.
C. To make the student's statement more accurate.
D. To repeat a point that she had not stated clearly.

解析：选C

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