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
66
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、color
B、trouble
C、sound
D、time
答案
A
解析
通过上下文可知,都是在说“颜色”。故选A。
转载请注明原文地址:https://kaotiyun.com/show/82Qd777K
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
SleeplessnessInsomniaorsleeplessnessisacommoncomplaintofwomenastheyenterintomenopause.Insomniameanshavingt
KnowingYourRealPersonalityfromSleepingPositionsEveryonehasgottwopersonalities—theonethatisshowntotheworld
SeekHealthandWellness1Whetheryouarebusystudyingorstartingclerkship,itisabsolutelyessentialtomaintainhealthan
ActiveinOldAgeKeepsPeopleMobilePeopleover70whoaren’tactivearemorelikelytodevelopproblemswalkingorclimbi
HappyTherapy(诊疗)NormanCousinswasabusinessmanfromtheUnitedStateswhooftentraveledaroundtheworldonbusiness.
AMakingfriendswithnewacquaintancesBCloselinkbetweencompanionshipandbelongingnessCHowtosatisfyotherpeople’s
Peoplearoundtheglobehittheheightoftheirmiseryanddepressionin(51)age,anewinternationalstudysuggests.The
Peoplearoundtheglobehittheheightoftheirmiseryanddepressionin(51)age,anewinternationalstudysuggests.The
随机试题
导致继发性腹膜炎的细菌中,最多见的是
证券交易结算证券账户是投资者用于证券交易资金清算,记录资金的币种、余额和变动情况的专用账户。()
在采用差异化战略的组织中,人力资源管理的重点是()。
商店无人光顾,售货员无所事事所承受的压力来自于()。
教师在“食物链”教学时,引用“螳螂捕蝉,黄雀在后”的古诗词来反问学生这是一种什么生物现象,进而引入正题。这种导入方式是()。
群体效应是指个体形成群体之后,通过群体对个体约束和指导,群体中个体之间的作用,就会使群体中的一群人,在心理和行为上发生一系列的变化。根据上述定义,下列选项不属于群体效应的是()。
Themulti-billion-dollarWesternpopmusicindustryisunderfire.ItisbeingblamedbytheUnitedNationsforthedramaticris
设,则a=_______.
设有选课表,表中包含字段有:学号N(6),课程号C(6),成绩N(4)。要查询每门课程的学生人数,要求显示课程号和学生人数,对应的SQL语句为:SELECT课程号,COUNT(学号)AS学生人数FROM选课表;GROUPBY______
以下数据结构中,属于非线性数据结构的是()。
最新回复
(
0
)