Every human being, no matter what he is doing, gives off body heat. The usual problem is how to dispose of it. But the designers of the Johnstown campus of the University of Pittsburgh set themselves the opposite problem-how to collect body heat. They have designed a collection system which utilizes not only body heat, but the heat given off by such objects as light bubs and refrigerators as well. The system works so well that no conventional fuel is needed to make the campus's six buildings comfortable.
　　Some parts of most modern buildings-theaters and offices as well as classrooms are more than amply heated by people and lights and sometimes must be air-conditioned even in winter. The technique of saving heat and redistributing it is called "heat recovery." A few modern buildings recover heat, but the University's system is the first to recover heat from some buildings and re-use it in others.
　　Along the way, pit has learned a great deal about some of its heat producers. The harder a student studies, the more heat his body gives off. (76.Male students emit more heat than female students, and the larger a student, the more heat he produces. It is tempting to conclude that the hottest prospect for the Johnstown campus would be a hardworking, overweight male genius.
　　16. Until recently, body heat has caused problems because it ______.
　　A. was difficult to collect
　　B. came in a variety of forms
　　C. was difficult to get rid of
　　D. tended to be absorbed by physical objects
　　答案：C
　　17. Which of the following is true of the heating system of the Johnstown campus?
　　A. The heat is supplied by human bodies only.
　　B. The heat is supplied by both human bodies and other heat-emitting objects.
　　C. The heat is supplied by both human bodies and conventional fuel.
　　D. The heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.
　　答案：B
　　18.The phrase "even in winter" (in line 8.most nearly means ______.
　　A. if the winter is especially warm
　　B. during all of the year except the winter
　　C. in the winter as well as in other seasons
　　D. during the evenings in the winter
　　答案：C
　　19. The phrase "heat recovery" refers to a ______.
　　A. method of concealing the source of heat
　　B. special form of air conditioning
　　C. supplementary hot water system
　　D. way of reclaiming and re-using heat
　　答案：D
　　20. According to the passage which of the following would produce the LEAST amount of heat?
　　A. A fat female who studies hard.
　　B. A thin female who does not study.
　　C. A fat male who does not study.
　　D. A thin male who studies hard.
　　答案：B

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