环境科学 TPO53-L2 Two Kinds of Pollution

环境科学

TPO53-L2 Two Kinds of Pollution


Listen to part of a lecture in an environmental science class.



  1. What is the lecture mainly about?
  • A. The difference between point source and non-point source pollution
  • B. The source and treatment of a serious type of pollution affecting the Chesapeake Bay
  • C. The causes for the large decrease in algae in the Chesapeake Bay
  • D. The development of farming methods during the past century

 

  1. What is one of the reasons that the professor mentions pollution that comes from a pipe?
  • A. To compare point source pollution with non-point source pollution
  • B. To blame factories and sewage treatment plants for producing most water pollution
  • C. To demonstrate that agricultural runoff is a point source pollutant
  • D. To suggest new methods that may someday begin to reduce water pollution

 

  1. According to the professor, why has it been difficult for fish and many other organisms to live in the Chesapeake Bay?
  • A. Toxic chemicals in the water have poisoned many of them.
  • B. Runoff from farmland has made the water very muddy.
  • C. Water flow from streams has been unreliable.
  • D. Oxygen levels in the water have been reduced.

 

  1. What is the professor’s attitude about the use of chemical fertilizer?
  • A. She is surprised that some farmers have stopped using it.
  • B. She is convinced that its use should be increased substantially.
  • C. She worries that farmers may be using too much of it.
  • D. She regrets that it was not more useful for increasing crop production.

 

  1. What two practices does the professor suggest for reducing the amount of nitrogen that enters a bay such as the Chesapeake?
    [CHOOSE 2 ANSWERS]
  • A. Planting trees along the sides of streams
  • B. Building water treatment facilities where streams enter the bay
  • C. Planting cover crops that take up excess nitrogen in the soil
  • D. Letting farm animals graze in areas near streams and the bay

 

  1. According to the professor, why were farmers reluctant to create buffer zones near streams?
  • A. They were not convinced that buffer zones effectively control pollution.
  • B. They feared that creating buffer zones might decrease farm income.
  • C. Government approval for creating buffer zones was at first difficult to obtain.
  • D. Planting trees was much more expensive than planting the usual crops.


答案:
B A D C AC B

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