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【B20】
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A．To find an important, interesting job.B．To win respect from others.C．To do research
听力原文： Most American university students study for 4 years or more to get a college degree. During this time, they are called undergraduate students. When a student completes his courses, he earns a bachelor's degree which will help him find jobs.
Many students postpone finding jobs. They stay at the university and work for a higher degree. Other students take a job for a few years. When they quit working, they resume studying at the university. These students work to earn higher degrees, a master's or a doctorate. They are called graduate students.
Graduate students specialize in a particular field of study. They study to become experts in this field and to learn new advances in their fields while they earn an M.A. or Ph. D. Sometimes when they get an M.A. in one field, they begin studying in another field. They hope to get jobs that are interesting and high paying.
The life of a graduate student is often difficult. They are usually too busy studying to make a good living. Often they have to pay high tuition fees for their education. Some give up studying before they get their degrees. But most keep on working at their studies until they graduate. In today's world, most graduate students don't regret spending time on their studies. They are finding that things are changing very fast and study has become a necessity.
(33)
【B19】
听力原文： In the future, water problems will become more and more serious. Our increasing population will greatly increase urban wastes. On the other hand, people's increasing demand for water will decrease the amount of water which can be used for drinking. Rapidly developing industries will produce more liquid wastes. And many of them contain chemicals that will be harmful to people's health.
To feed our expanding population, agriculture will have to be developed. Thus larger quantities of agricultural chemicals will be produced in this process. In such an urgent situation, drastic measures must be taken immediately for the pollution problem. The first way is to treat the wastes properly to reduce their danger to society. This involves the processing of solid wastes first, and then comes to the treatment of liquid wastes. A second approach is to recycle or reuse all or part of the wastes. Farm waste water is spread in fields as nutrient supplement. Water waste from recycling plants can be used for irrigation and also as a supplemental source of water.
(30)
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