TPO42听力题目文本及音频下载

　　Lecture3(Environmental Science)

　　QUESTIONS

　　1. What is the lecture mainly about?

　　A. Why fungi cannot grow well in polluted ecosystems

　　B. Why fungi pose a danger to the underground water system

　　C. How to prevent heavy metals from getting into the soil

　　D. How fungi can clean up pollution that is in the soil

　　2. What does the professor say about the way fungi get their food?

　　A. They use certain metal compounds in the soil as nutrients.

　　B. The enzymes that they produce allow them to absorb organic nutrients from the soil.

　　C. They separate nutrients from heavy metals and then return the metals to the soil.

　　D. Heavy metals interfere with their way of getting nutrients from the soil.

　　3. What two points does the professor make about chitin?

　　Click on 2 answers.

　　A. Chitin binds strongly to certain heavy metals.

　　B. Insects need chitin in order to digest the fungi they eat.

　　C. Chitin can be added to soil to create a good habitat for fungi.

　　D. The cell walls of fungi, like the exoskeletons of insects, contain chitin.

　　4. What do adsorption and absorption in fungi have in common?

　　A. They both can help the production of new filaments.

　　B. They both can increase the production of chitin.

　　C. They both can help keep pollutants out of groundwater.

　　D. They both result in the strengthening of cell walls.

　　5. Why does the professor mention the antibiotic penicillin?

　　A. To suggest that more fungi should be investigated as potential sources of medications

　　B. To point out that certain heavy metals are needed for the production of penicillin

　　C. To criticize the pharmaceutical industry for contributing to environmental pollution

　　D. To show how a waste product from one process can be useful in another process

　　Listen again to part of the lecture. Then answer the question.

　　6. Why does the professor say this:

　　A. She does not have time to fully explain the reason.

　　B. She is hopeful that students will be able to figure out the reason.

　　C. She wonders why mushrooms are not already used for cleaning up pollution.

　　D. She realizes that the research she has been discussing is still in its early stages.