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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 also the heat given off by such objects as light bulbs 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, Pitt has learned a great d
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.
A.专业培训
B.B.考试合格
C.C.技能培训
D.D.现场实习
I get a lot of letters at this time of year from people complaining that they have a cold which won’t go away. There are so many different stories about how to prevent or cure a cold; it’s often difficult to know what to do. Although colds are rarely dangerous, except for people who are already weak, such as the elderly or young babies, they are always uncomfortable and usually most unpleasant. Of course you can buy lots of medicines which will help to make your cold less unpleasant, but you must remember that nothing can actually cure a cold or make it go away any faster. Another thing is that any medicine which is strong enough to make you feel better could be dangerous if you are already taking drags for some other illness, so always check with your chemist or doctor to see whether they are all right for you. And remember they might make you sleepy. Please don’t try to drive if they do! Lastly, as far as avoiding colds, the best answer is to keep strong and h
A. to write in an amusing way
B. to give general advice
C. to complain about his health
D. to describe personal experiences
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