TPO44听力题目文本及音频下载

　　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.

　　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.

　　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.

　　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.

　　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.

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