2014年职称英语理工类A级考前押题(二)

　　Superconductor Ceramic (陶瓷)

　　An underground revolution begins this winter. With the flip (轻击) of a switch,30,000homes in one part of Detroit will soon become the first in the country to receive electricitytransmitted by ice cold high performance cables. Other American cities are expected to followDetroit'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 becausethey are made of superconductors. A superconductor is a material that transmits electricity withlittle or no resistance. Resistance is the degree to which a substance resists electric current. Allcommon electrical conductors have a certain amount of electrical resistance. They convert atleast 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 lose its resistance. The first superconductors, made more than 50years ago, had to be cooled to -263 degrees Celsius before they lost their resistance. Newersuperconducting materials lose their resistance at -143 degrees Celsius.

　　The superconductors cable installed at the Frisbie station is made of a ceramic material thatcontains copper, oxygen, bismuth (铋), strontium (锶), and calcium (钙). A ceramic is ahard, strong compound made from clay or minerals. The superconducting ceramic has beenfashioned into a tape that is wrapped lengthwise around a long tube filled with liquid nitrogen.Liquid nitrogen is super cold and lowers the temperature of the ceramic tape to the point where itconveys electricity with zero resistance.

　　The United States loses an enormous amount of electricity each year to resistance. Becausecooled supercondUutors have no resistance, they waste much less power, other cities arewatching the Frisbie experiment in the hope that they might switch to superconducting cable andconserve power, too.

　　What is the benefit of the revolution mentioned in the first paragraph?

　　A.With a flip of swish, electricity can be transmitted.

　　B.Other American cities can benefit from the high-performance cables.

　　C.Great amounts of power can be conserved.

　　D.Detroit will first receive electricity transmitted by the new electrical cables

　　37、 Compared to common electrical conductors, superconductors__________

　　A.have little or no electrical resistance

　　B.Can be used for along time

　　C.are not energy-efficient

　　D.can be made easily

　　38、 At what temperature does the superconducting ceramic lose its resistance__________?

　　A.-143 degree Celsius.

　　B.-263 degree Celsius.

　　C.As long as it is ice-cold.

　　D.Absolute zero.

　　39、 What element enables the ceramic tape to lower its temperature__________?

　　A.Copper.

　　B.Liquid nitrogen.

　　C.Clay.

　　D.Calcium.

　　40、 According to the last paragraph, which of the following statements is NOT true__________?

　　A.Other cities hope they Can also conserve power.

　　B.Other cities hope they Can use superconducting cables soon.

　　C.Superconductors waste less power because of their low resistance.

　　D.The Fribie experiment is not successful.

　　The Science of the Future

　　Until recently, the "science of the future" was supposed to be electronics and artificialintelligence. Today it seems more and more likely that the next great breakthroughs intechnology will be brought through a combination of those two sciences with organic chemistryand genetic engineering. This combination is the science of biotechnology.

　　Organic chemistry enables us to produce marvelous synthetic (合成的) materials. However,it is still difficult to manufacture anything that has the capacity of wool to conserve heat and alsoto absorb moisture. Nothing that we have been able to produce so far comes anywhere near thecombination of strength, lightness and flexibility that we fred in the bodies of ordinary insects.Nevertheless, scientists in the laboratory have already succeeded in "growing" a material that has many of the characteristics of human skin. The next step may well be "biotech heartsand eyes" which can replace diseased organs in human beings. These will not be rejected by thebody, as is the case with organs from humans.

　　The application of biotechnology to energy production seems even more promising. In1996 the famous science-fiction writer, Arthur C. Clarke, many of whose previous predictionshave come true. He said that we may soon be able to develop remarkably cheap and renewablesources of energy. Some of these power sources will be biological. Clarke and others havewarned us repeatedly that sooner or later we wi/1 have to give up our dependence on non-renewable power sources. Coal, oil and gas are indeed convenient. However, using them alsomeans creating dangerously high levels of pollution. It will be impossible to meet the growingdemand for energy without increasing that pollution to catastrophic (灾难性的) levels unlesswe develop power sources that are both cheaper and cleaner.

　　It is attempting to think that biotechnology or some other "science of the future" can solveour problems. Before we surrender to that temptation we should remember nuclear power.Only a few generations ago it seemed to promise/imit/ess, cheap and safe energy. Today thosepromises lie buried in a concrete grave in a place called Chernobyl, in the Ukraine.Biotechnology is unlikely, however, to break its promises in quite the same or such a dangerousway.

　　According to the passage, the science of the future is likely to be__________

　　A.electronics

　　B.biotechnology

　　C.genetic engineering

　　D.nuclear technology

　　42、 Organic chemistry helps to produce materials that are__________

　　A.as good as wool

　　B.as good as an insect's body

　　C.not as good as natural materials

　　D.better than natural materials

　　43、 According to the passage, it may soon be possible__________

　　A.to make something as good as human skin

　　B.to produce drugs without side effects

　　C.to transplant human organs

　　D.to make artificial hearts and eyes

　　44、 In 1996, Arthur C. Clarke predicted that__________

　　A.biological power sources would be put into use soon.

　　B.oil, gas and coal could be repeatedly used in the future.

　　C.dependence on non-renewable power sources would be reduced soon.

　　D.the Chernobyl disaster would happen in two years.

　　45、 What do we learn from the last paragraph__________?

　　A.Biotechnology can solve all our future energy problems.

　　B.Biological power is cheaper than nuclear power.

　　C.Biological power may not be as dangerous as nuclear power.

　　D.Biological power will keep all its promises.