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
考研
Anybody who doesn’t know much about nanotechnology should【B1】 ________ geckos. These are the lizards that are probably the worl
Anybody who doesn’t know much about nanotechnology should【B1】 ________ geckos. These are the lizards that are probably the worl
admin
2021-09-25
86
问题
Anybody who doesn’t know much about nanotechnology should【B1】 ________ geckos. These are the lizards that are probably the world’s best climbers. Watching them climb upside down on a horizontal pane of glass, you realize that spiderman should really have been called geckoman. These guys outclimb spiders any day.
With perfect【B2】 ________ they can hang from a single toe, and they do so by pure adhesion, not by sticking a toe in a hole or by【B3】 ________ it round something they can grip. With all the toes on the glass scientists【B4】 ________ that if the rest of the body were strong enough it could take the weight of a 100kg person【B5】 ________ below it. Although each toe is【B6】 ________ with a tiny hook-like claw at the end, these are of no use on the glass. What keeps them up there is the amazing structure of the skin of the toe.
Seen under the microscope each toe has around two million tiny hairs on its underside. Under the higher【B7】 ________ of an electron microscope the end of each of these hairs is seen to【B8】 ________ into hundreds of even tinier nano-hairs, which scientists have called spatulae. These hairs are so small that they are able to establish contact with the molecular structure of the surface the gecko is walking on. With that near-perfect contact the hairs are stuck to the surface by forces called van der Waals forces. The molecules on the feet and on the surface have areas of slight positive or negative【B9】 ________ that attract each other like mini magnets when they get really close.
Scientists have been working for over 15 years now to try to【B10】 ________ the secrets of the stickiness of gecko toes and find a way to【B11】 ________ reproduce the same structure of nano-hairs. The【B12】 ________ at the moment is that if any material can be shaped into nano-hairs they will have the same【B13】 ________ as those on gecko toes, so scientists are looking for a (n) alternative material with which to【B14】 ________ the stickiest synthetic surface ever.
This is one example of research in the field now known as nanotechnology. In this field, the technology being created can be【B15】 ________ in a few nanometres (one nanometre is a millionth of a millimetre). Interest in developing technology at this level was largely inspired by Richard Feynman at the beginning of the 1960’s, but the "nano" catchphrase was【B16】 ________ in the 1990’s by Dr. Eric Drexler, who【B17】 ________ scientists on through a series of speeches and a book entitled " Engines of Creation; The Coming Era of Nanotechnology".
The scientists working on the geckos【B18】 ________ an enormously wide range of possible applications for the kind of adhesive nanotechnology that they will develop. The one that will make the biggest splash in the media will be the gloves and the boots that will allow rock-climbers to take their sport to【B19】 ________ undreamed of heights. And the technology could also be used in surgery to keep the edges of wounds together without the need for stitches. There will also be a huge potential in the manufacturing sector to stick millions of 【B20】 ________ together tighter than ever before without glues or screws.
【B19】
选项
A、thereby
B、hitherto
C、whatsoever
D、henceforth
答案
B
解析
逻辑关系题。选项的意思分别为[A]“因此,由此”;[B]“迄今,至今”;[C] “无论什么,丝毫”;[D]“从此以后”。本句说的是,“手套和靴子这些装备将使攀岩者能够爬到 ________ 做梦也想不到的高度”,将选项带入句子,发现只有[B]语义合适。
转载请注明原文地址:https://kaotiyun.com/show/4p1Z777K
0
考研英语一
相关试题推荐
Hewasluckier,however,becausehewasonlyslightlywounded.
In1924America’sNationalResearchCouncilsenttwoengineerstosuperviseaseriesofexperimentsatatelephone-partsfactory
In1924America’sNationalResearchCouncilsenttwoengineerstosuperviseaseriesofexperimentsatatelephone-partsfactory
Manytheoriesconcerningthecausesofjuveniledelinquency(crimescommittedbyyoungpeople)focuseitherontheindividualor
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed
Duringthetraditionalweddingceremony,the【C1】______couplepromiseeachotherlifelongdevotion.Yet,aboutoneoutoffourAm
Jeandoesn’twanttoworkrightawaybecauseshethinksthatifshe______ajobsheprobablywouldn’tbeabletoseeherfriends
Shortstoriesareduearevival.Inrecentyears,therehavebeencritically【C1】______collectionsbyAmericanwriterssuchasLy
Computerintelligencewilloverturneverythingfrommedicinetothestockmarketandtherevolutionisonlyjustbeginning.【
随机试题
根据定金罚则,给付定金的一方不履行约定债务的,无权要求返还定金,收受定金的一方不履行约定债务的,应当_______。
免疫组织化学过程不包括
尖锐湿疣好发于:
鹅口疮心脾积热证的首选方剂是
自截肾的X线征像表现为
等直杆的受力情况如图5-1所示,则杆内最大轴力FNmax和最小轴力FNmin分别为()。
当按工程项目施工层次划分系统控制过程时,( )的质量控制是最基本的质量控制。
【2015年安徽.单选】学生上课思想开小差、心不在焉,教师突然加重语气是为了引起学生的()。
平衡计分卡方法认为,组织应从()角度审视自身业绩。
请在【答题】菜单下选择【进入考生文件夹】命令,并按照题目要求完成下面的操作。注意:以下的文件必须都保存在考生文件夹下。小李是东方公司的会计,利用自己所学的办公软件进行记账管理,为节省时间,同时又确保记账的准确性,她使用Excel编制了2
最新回复
(
0
)