题目内容
In the first paragraph, the author argues that pollution_________
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Superconductor Ceramic（陶瓷） An underground revolution begins this winter.with the flip(轻击)of a switch，30，000 homes in one part of Detroit will soon become the first in the country to receive electricity transmitted by ice.cold high.performance cables.Other American cities are expected to follow Detroit’s example in the years ahead.which could conserve enormous amounts of power.
The new electrical cables at the Frisbie power station in Detroit are revolutionary because they are made of superconductors.A superconductor is a material that transmits electricity with little or no resistance.Resistance is the degree to which a substance resists electric current.All common electrical conductors have a certain amount of electrical resistance.They convert at least some of the electrical energy passing through them into waste heat.Superconductors don’t.No one understands how superconductivity works.It just does.
Making superconductors isn’t easy.A superconductor material has to be cooled to an extremely low temperature to 10se its resistance.The first superconductors，made more than 50 years ago，had to be cooled to一263 degrees Celsius before they lost their resistance.Newer superconducting materials 10se their resistance at一143 degrees Celsius.
The superconductors cable installed at the Frisbie station is made of a ceramic material that contains copper.oxygen.bismuth(铋)。strontium(锶).and calcium(钙).A ceramic is a hard.strong compound made from clay or minerals.The superconducting ceramic has been fashioned into a tape that is wrapped lengthwise around a long tube filled with liquid nitrogen.Liquid nitrogen is supercold and lowers the temperature of the ceramic tape to the point where it conveys electricity with zero resistance.
The United States loses an enormous amount of electricity each year to resistance.Because cooled superconductors have no resistance.they waste much less power.0ther cities are watching the Frisbie experiment in the hope that they might switch to superconducting cable and conserve power too.
第6题：What is the benefit of the revolution mentioned in the first paragraph？
The author’s attitude towards Larry Myers’ works is ________.
A. miss B. have C. win D. lose
As a result, many people avoid the very attempts that are the source of true happiness. They fear the pain inevitably brought by such things as marriage, raising children, professional achievement, religious commitment (承担的义务), self-improvement.
Ask a bachelor (单身汉) why he resists marriage even though he finds dating to be less and less satisfying. If he is honest he will tell you that he is afraid of making a commitment. For commitment is in fact quite painful. The single life is filled with fun, adventure, excitement. Marriage has such moments, but they are not its most distinguishing features.
Couples with infant children are lucky to get a whole night’s sleep or a three-day vacation. I don’t know any parent who would choose the word fun to describe raising children. But couples who decide not to have children never know the joys of watching a child grow up or of playing with a grandchild.
Understanding and accepting that true happiness has nothing to do with fun is one of the most liberating realizations. It liberates time: now we can devote more hours to activities that can genuinely increase our happiness. It liberates money: buying that new car or those fancy clothes that will do nothing to increase our happiness now seems pointless. And it liberates us from envy: we now understand that all those who are always having so much fun actually may not be happy at all.
第31题：According to the author, a bachelor resists marriage chiefly because ________.
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