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
Seeing Red Means Danger Ahead The color red often means danger-and by paying attention,accidents can be prevented.In the futu
Seeing Red Means Danger Ahead The color red often means danger-and by paying attention,accidents can be prevented.In the futu
admin
2011-01-10
95
问题
Seeing Red Means Danger Ahead
The color red often means danger-and by paying attention,accidents can be prevented.In the future,the color red also may help【51】______danger at construction sites.Thanks to new work by engineers,bridge supports-or【52】______kinds of materials-could one day contain a color-changing material.It will turn red【53】______a structure collapses or falls apart.
The secret【54】______the color-changing material is a particular type of molecule(分子).A molecule is a group of atoms(原子)held together by chemical bonds.Molecules come【55】______all shapes and sizes,and make up【56】______you can see,touch or feel.How a molecule behaves depends on【57】______kinds of atoms it contains,and how they’re held together.
When a polymer(聚合物)containing a color-changing molecule called a mechanophore(机械响应性聚合物)is about to break,it produces a【58】______.When a polymer with mechanophore molecules becomes“injured”or【59】______,one of the mechanophore bonds【60】______and the material turns red.“It’s a really simple detection method,”says Nancy Sottos,one of the scientists who worked on the project.Sottos and her team tested the color-changing polymers in their lab.The test【61】______ proved encouraging.
There is a way to get rid of the red color:light.When a bright light is shone on the mechanophore, the broken bond is fixed-and the red color【62】______.This“self-healing”may be a problem for engineers.They need to use the color-changer in big construction projects that will be【63】______,in sunlight.And sunlight will make the mechanophore’s warning system【64】______.
Sottos and her fellow scientists still have【65】______work to do before the color-changing molecules can be used outside the lab.
选项
A、dangerous
B、useless
C、helpful
D、important
答案
B
解析
此处是说,阳光会使这种机械响应性聚合物的报警系统失灵。故选B。
转载请注明原文地址:https://kaotiyun.com/show/t2Qd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
Theresearchshouldproveinvaluableinthestudyoflinguistics.
KnowingYourRealPersonalityfromSleepingPositionsEveryonehasgottwopersonalities—theonethatisshowntotheworld
FriendlyRelationswiththePeopleAround1Youdependonallthepeoplecloselyaroundtogiveyouthewarmfeelingofbelongin
Youshouldhaveblendedthebutterwiththesugarthoroughly.
HealthyFoodStreetsellers,particularlyindevelopingcountries,supplylargeamountsoffood(51)peopleonlowincomes.Thi
HealthyFoodStreetsellers,particularlyindevelopingcountries,supplylargeamountsoffood(51)peopleonlowincomes.Thi
AMakingfriendswithnewacquaintancesBCloselinkbetweencompanionshipandbelongingnessCHowtosatisfyotherpeople’s
Defectsinasystemofeducationshouldbeimprovedgradually.
1.Cancerisadiseaseinwhichcellsmultiplywithoutcontrol,destroyhealthytissue,andendangerlife.About100kindsofca
Mom’sTrafficAccidentsTheybicyclingcrazecameinwhenwewerejustaboutattherightagetoenjoyit.Atfirsteven"sa
随机试题
甲状腺肿大并出现Homer综合征时,最可能的诊断是
( )开挖的基本作业是铲土、运土和卸土三个工作行程和空载回驶行程,可以摊挖一至三类土,四类土以上需经预松后才能作业。
下列设备中,具有USB接口的有()。
下列关于利息率的说法,错误的是()。
甲公司2009年1月1日购入A公司当日发行的3年期公司债券作为持有至到期投资金融资产。购买价款为53000万元,另支付相关费用50万元,债券面值50000万元,每半年付息一次,到期还本,该债券票面利率6%,实际利率4%。采用实际利率法摊销,则甲公司20
个性的()是个性最本质的属性。
人民警察依法使用警械、武器,造成无辜人员伤亡或者财产损失的,由该人民警察给予补偿。()
中世纪的阿拉伯人有许多古希腊原文的手稿。当需要的时候,人们就把它译成阿拉伯语。中世纪的阿拉伯诗人对亚里士多德的《诗论》非常感兴趣,这种兴趣很明显并不被扩展到荷马的诗,因为一个对《诗论》感兴趣的诗人一定会想读荷马的诗,亚里士多德就经常参考荷马的诗,但是荷马的
Abroadpublicdiscussionofenvironmentalproblemsbeganinthemid-1980s,whenthefirst"green"groupsformedinopposition
A、Ms.Cornersthreatenedtogetheroutoftherentedapartment.B、Thedishwasherstilldidn’tworkafterbeingrepaired.C、The
最新回复
(
0
)