托福TPO59听力原文+题目+答案解析：Listening L1

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TPO59Listening L1听力原文+题目Listening L1

1. What is the lecture mainly about?

A. Differences between tundra and grassland ecosystems

B. Reasons seabirds prosper in an island ecosystem

C. Why introduced species have difficulty adapting to a new ecosystem

D. How introduced species can affect ecosystems

2. What initially caused the ecosystem of some of the Aleutian Islands to change?

A. Traders brought a new species of mammal to some of the islands

B. Scientists introduced a new species of grass on some of the islands

C. The temperature of the soil suddenly decreased on some of the islands

D. The population of nest‐building seabirds increased on some of the islands

3. The professor mentions that some of the Aleutian Islands were deprived of ocean‐derived nutrients. What was the direct result of the deprivation?

A. A rise in the fox population

B. An absence of seabirds

C. A change in the vegetation

D. The exposure of volcanic rock

4. What does the professor imply when she points out that most seabirds have only one offspring per year?

A. It will take many years for the Aleutian ecosystem to be restored

B. Many species of seabirds are in danger of becoming extinct

C. Scientists should have been able to predict the foxes' impact

D. The seabirds would have become endangered even without the foxes

5. What is the professor's opinion regarding the introduction of nonnative species into an ecosystem?

A. It is almost always disastrous for the species native to that habit at

B. Its risks can be minimized if it is done with sufficient forethought

C. Its consequences are impossible to predict

D. Its scientific usefulness is questionable

6. What does the professor imply when she says this

A. She is excited by the implications of the student's idea

B. She wants the student to explain better what he means

C. The student 's theory does not fit the facts

D. The student's explanation is probably correct

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