职称英语考试

试题来源：2015年职称英语《理工类》热身模拟试题及答案(1)

SuperconductorCeramic (陶瓷)

An underground revolutionbegins this winter. With the flip (轻击) of aswitch,30,000homes in one part of Detroit will soon become the first in thecountry to receive electricitytransmitted by ice cold high performance cables.Other American cities are expected to followDetroit's example in the yearsahead, which could conserve enormous amounts of power.

The new electrical cables atthe Frisbie power station in Detroit are revolutionary becausethey are made ofsuperconductors. A superconductor is a material that transmits electricitywithlittle or no resistance. Resistance is the degree to which a substanceresists electric current. Allcommon electrical conductors have a certain amountof electrical resistance. They convert atleast some of the electrical energypassing through them into waste heat. Superconductors don't.No one understandshow superconductivity works. It just does.

Making superconductors isn'teasy. A superconductor material has to be cooled to an extremely lowtemperature to lose its resistance. The first superconductors, made more than50years 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 cableinstalled at the Frisbie station is made of a ceramic material thatcontainscopper, oxygen, bismuth (铋), strontium (锶), and calcium (钙). A ceramic is ahard,strong compound made from clay or minerals. The superconducting ceramic hasbeenfashioned into a tape that is wrapped lengthwise around a long tube filledwith liquid nitrogen.Liquid nitrogen is super cold and lowers the temperatureof the ceramic tape to the point where itconveys electricity with zeroresistance.

The United States loses anenormous amount of electricity each year to resistance. BecausecooledsupercondUutors have no resistance, they waste much less power, other citiesarewatching the Frisbie experiment in the hope that they might switch tosuperconducting cable andconserve power, too.

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

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

B.Other American cities canbenefit from the high-performance cables.

C.Great amounts of power canbe conserved.

D.Detroit will first receiveelectricity transmitted by the new electrical cables

37、 Compared to common electrical conductors, superconductors__________

A.have little or no electricalresistance

B.Can be used for along time

C.are not energy-efficient

D.can be made easily

38、 Atwhat temperature does the superconducting ceramic lose itsresistance__________?

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 NOTtrue__________?

A.Other cities hope they Canalso conserve power.

B.Other cities hope they Canuse superconducting cables soon.

C.Superconductors waste lesspower because of their low resistance.

D.The Fribie experiment is notsuccessful.

试题出处：http://www.examtiku.com/shiti/714796531.html
网考网参考答案：C、A、A、B、D
网考网解析：进入考试题库查看解析
大数据分析：根据网考网与考试题库的统计分析，该试题：
31%的考友选择了A选项
38%的考友选择了B选项
30%的考友选择了C选项
1%的考友选择了D选项
考友解析与评论：
 · 呵呵 犯了同样的错
 · 审题不仔细
 · 这个答案靠谱吗？