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
30
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、on
B、behind
C、under
D、down
答案
B
解析
此处考查“……背后的秘密”,behind表示“后面的”,故选B。
转载请注明原文地址:https://jikaoti.com/ti/P86sFFFM
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
DangersAwaitBabieswithAltitudeWomenwholiveintheworld’shighestcommunitiestendtogivebirthtounderweightbabie
SleeplessnessInsomniaorsleeplessnessisacommoncomplaintofwomenastheyenterintomenopause.Insomniameanshavingt
SeekHealthandWellness1Whetheryouarebusystudyingorstartingclerkship,itisabsolutelyessentialtomaintainhealthan
HealthyFoodStreetsellers,particularlyindevelopingcountries,supplylargeamountsoffood(51)peopleonlowincomes.Thi
AMakingfriendswithnewacquaintancesBCloselinkbetweencompanionshipandbelongingnessCHowtosatisfyotherpeople’s
Defectsinasystemofeducationshouldbeimprovedgradually.
1.Cancerisadiseaseinwhichcellsmultiplywithoutcontrol,destroyhealthytissue,andendangerlife.About100kindsofca
Peoplearoundtheglobehittheheightoftheirmiseryanddepressionin(51)age,anewinternationalstudysuggests.The
Mom’sTrafficAccidentsTheybicyclingcrazecameinwhenwewerejustaboutattherightagetoenjoyit.Atfirsteven"sa
Mom’sTrafficAccidentsTheybicyclingcrazecameinwhenwewerejustaboutattherightagetoenjoyit.Atfirsteven"sa
随机试题
スピーチ大会で優勝したため、テレビ局の________を受けることになった。カメラの前で質問に答えて話すのはスピーチより緊張したが、良い経験になった。
设F(x)=,则F'(x)=
A、captainB、certainC、fountainD、mountainB选项B画线字母读[e],其他选项画线字母读[i]。
相关人员在值班,巡查、检测、灭火演练中发现的消防设施存在问题和故障后,下列说法中不正确的是()。
个人以抵押贷款方式向银行贷款购买房屋时,作为个人住房贷款的抵押物首先是()。
改革开放以来,大批的劳动者从内地向东南沿海地区流动,去当地一些新兴的民营企业工作,这些劳动者经常在不同企业间跳槽。有些民营企业为素质和绩效比较好的员工提供脱产培训的机会,但是要求接受培训的员工签订培训协议,协议的主要内容是,员工在受训后必须在企业中工作一定
(2013年)2013年4月19日,甲公司向乙公司签发了一张出票后2个月付款、金额为20万元的商业汇票,该汇票载明丙公司为付款人,丁公司在汇票上签章作了保证,但未记载被保证人名称。乙公司取得汇票后背书转让给戊公司,但未记载背书日期,戊公司于2013年5月1
家庭财产保险适用的对象不包括()。
Thearrivalofthemass-producedcar,justoveracenturyago,causeda(n)(1)_____ofbusinesscreation.Firstcamethemakerso
Whetherthatisagoodsolutiondependson______.
最新回复
(
0
)