首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The Stone age, the Iron age. Entire epochs have been named for materials. So what to name the decades ahead? The choice will be
The Stone age, the Iron age. Entire epochs have been named for materials. So what to name the decades ahead? The choice will be
admin
2011-02-16
79
问题
The Stone age, the Iron age. Entire epochs have been named for materials. So what to name the decades ahead? The choice will be tough. Welcome to the age of superstuff. Material science—once the least sexy technology—is bursting with new, practical discoveries led by superconducting ceramics that may revolutionize electronics. But superconductors are just part of the picture; from houses and cars to cook pots and artificial teeth, the world will sometime be made of different stuff. Exotic plastics, glass and ceramics will shape the future just as surely as have genetic engineering and computer science.
The key to the new materials is researchers’ increasing ability to manipulate substances at the molecular level. Ceramics, for instance, have long been limited by their brittleness. But by minimizing the microscopic imperfections that cause it, scientists are making far stronger ceramics that still retain such qualities as hardness and heat resistance. Ford Motor Co. now uses ceramic tools to cut steel. A firm called Kyocera has created a line of ceramic scissors and knives that stay sharp for years and never rust or corrode.
A similar transformation has overtaken plastics. High-strength polymers now form bridges, iceskating rinks and helicopter rotors. And one new plastic that generates electricity when vibrated or pushed is used in electric guitars, touch sensors for robot hands and karate jackets that automatically record each punch and chop. Even plastic litter, which once threatened to permanently blot the landscape, has proved amenable to molecular tinkering. Several manufacturers now make biodegradable forms; some plastic six-pack rings for example, gradually decompose when exposed to sunlight. Researchers are developing ways to make plastics as recyclable as metal or glass. What’s more, composites—plastic reinforced with fibres of graphite or other compounds—made the round-the-world flight of the voyager possible and have even been proved in combat:a helmet saved an infantryman’s life by deflecting two bullets in the Grenada invasion.
Some advanced materials are old standard with a new twist. The newest fiberoptic cables that carry telephone calls cross-country are made of glass so transparent that a piece of 100 miles thick is clearer than a standard window pane.
But new materials have no impact until they are made into products. And that transition could prove difficult, for switching requires lengthy research and investment. It can be said a firmer handle on how to move to commercialization will determine the success or failure of a country in the coming future.
Why could not ceramics be used widely in the past?
选项
A、Because of their brittleness.
B、Because people didn’t know how to use them.
C、Because they were not useful.
D、Because they could not resist heat.
答案
A
解析
由短文第二段中的“Ceramics,flor instance,have long been limited by their brittleness.”。
转载请注明原文地址:https://kaotiyun.com/show/DKHd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
ImproveComputer-researchSkillsLikemanycollegestudents,JoseJuarezcarriesaroundapocket-sizedcomputerthatletshi
DancingintheStreetsIfthereisonethingcertaintogetBraziliansontheirfeet,itistheRioCarnival(狂欢节).Heldin
DancingintheStreetsIfthereisonethingcertaintogetBraziliansontheirfeet,itistheRioCarnival(狂欢节).Heldin
FederalDepositInsuranceCorporationBefore1933,andparticularlyduringtheperiod1929—1933,bankfailureswerenotunco
SpoiltforChoiceChoice,wearegiventobelieve,isaright.Indailylife,peoplehavecometoexpectendlesssituations
KeeponFightingTurningonceagaintothequestionofinvasion,Iwouldobservethattherehasneverbeenaperiodinallt
A.disciplineproblemsB.TheirchildhoodmemoriesC.theirstressD.moretrainingE.becauseofitslowpayF.ItsbenefitsParents
APowerfulInfluenceTherecanbenodoubtatallthattheInternethasmadeahugedifferencetoourlives.Parentsarewor
Thepassagemainlydiscusses______.Thephrase"biologicalcarboncopies"(para.4)refersto______.
Whatwasthecauseofthetragedy?
随机试题
组成药物为三七总皂苷的中成药是
因过量服用,可导致口角流涎、呕吐物、粪便多呈蓝绿色的中药是
足癣患者禁用的治疗药物是
根据《药品经营许可证管理办法》,关于许可证管理的说法正确的有()。
关于采样信号,不正确的说法是()。
政府对工程项目管理的主要任务不包括()。
1841年7月5日,()运送了570人从莱斯特前往拉夫巴勒参加禁酒大会,这次活动成为公认的近代旅游活动的开端。
下面()不属于幼儿园园地。
请在【答题】菜单下选择【进入学生文件夹】命令,并按照题目要求完成下面的操作。注意:以下的文件必须保存在考生文件夹下。文君是新世界数码技术有限公司的人事专员,国庆节过后,公司招聘了一批新员工,需要对他们进行人职培训。人事助理已经制作了一份
We______thisrecorderforfivehundredyuan.
最新回复
(
0
)