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
50
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、until
B、although
C、after
D、before
答案
D
解析
此处是说,它会在建筑物倒塌之前变成红色,所以应该选“之前”这一词义,故选D。
转载请注明原文地址:https://kaotiyun.com/show/u2Qd777K
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
Common-coldSenseYoucan’tbeatit,butyoudon’thavetojoinit.Maybeitgotthename"commoncold"becauseit’smorec
DangersAwaitBabieswithAltitudeWomenwholiveintheworld’shighestcommunitiestendtogivebirthtounderweightbabie
KnowingYourRealPersonalityfromSleepingPositionsEveryonehasgottwopersonalities—theonethatisshowntotheworld
FriendlyRelationswiththePeopleAround1Youdependonallthepeoplecloselyaroundtogiveyouthewarmfeelingofbelongin
People40yearsofagetodayseemtobeasyoungas______.In2000,middleagefortheaverageGermanoccurred______.
A.BreakthenewsascalmlyaspossibletochildrenB.BreakthenewsatyourownpaceC.Sharethegoodnewswithyourfriends
HealthyFoodStreetsellers,particularlyindevelopingcountries,supplylargeamountsoffood(51)peopleonlowincomes.Thi
Thesepaintingsareconsideredbymanytobe(authentic).
Sleepproblemscanseriouslyaffectone’squalityoflife."Sleepfragmentation"referstoamarkedlackof"REM"sleep.
随机试题
财政的adj.f______
中国证监会规定,发行人初次申请发行股票时,应当具备的条件主要包括哪些?
Iappreciate______toyourhome.
下列哪一个药物不能用于治疗心源性哮喘
相对危险度等于
下列有关消防水泵接合器安装的说法中,错误的是()。
航空公司的运价类别,以“M”表示()
商业银行建立的流动性风险管理的制度框架,制定了流动性风险偏好、流动性风险管理策略、政策和程序,对()等方面进行了详细规定。
已知C=6亿元,I=1亿元,间接税=1亿元,G=1.5亿元,X=2亿元,M=1.8亿元,则()。
Adidas系列平面广告之启动快乐原动力:Adidas在广告宣传时,引导消费者去追求一种运动、积极向上的健康生活方式,案例中的文案语言主要运用了()的修辞手法。
最新回复
(
0
)