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
A scientific discovery is often made【C1】______ before someone is able to put it to use.【C2】______ , scientists discovered how to
A scientific discovery is often made【C1】______ before someone is able to put it to use.【C2】______ , scientists discovered how to
admin
2009-02-10
39
问题
A scientific discovery is often made【C1】______ before someone is able to put it to use.【C2】______ , scientists discovered how to split atoms decades【C3】______ the invention of the atomic bomb and the use of【C4】______ power to produce electricity. But sometimes discovery and【C5】______ happen at the same time, as occurred more than thirty years ago【C6】______ the discovery of coherent light and the invention of the laser.
The word laser【C7】______ "light amplification by stimulated emission of radiation. To many people, lasers are very mysterious, but a laser is simply a【C8】______ that produces a strong light. The light from the laser is called【C9】______ light because it is light that only moves in one direction.【C10】______ , incoherent light, like the light from the sun or light from a bulb, moves away from its source【C11】______ all directions, so its strength is very spread out. The light from a laser, moving in only one direction and【C12】______ in a narrow beam, is much stronger. Laser light is created by a【C13】______ called stimulated emission. In this process, the atoms of a certain substance, such as a crystal or a gas, are excited 【C14】______ that they produce coherent light. A person working with a laser can aim this coherent light,【C15】______ a laser beam, in any direction.
As soon as the laser was developed, scientists began thinking of practical applications【C16】______ it. One of the earliest uses was to make extremely precise measurements of distance and speed.【C17】______ , the distance to the moon was measured to within a foot, and the speed of light was measured to 【C18】______ a thousandth of a mile per second. As time【C19】______ , many more applications for the laser were【C20】______ .
【C16】
选项
A、of
B、from
C、for
D、with
答案
C
解析
此题考查介问的用法。这里应该选择for.表示目的,也就是applications for the laser,原因在于本文现在谈到的是科学家在思考如何应用这一新的发现。若用A项of,读者的感觉是这种应用已经存在或者出现。故C项符合题意。
转载请注明原文地址:https://jikaoti.com/ti/Tv5MFFFM
0
专业英语四级
相关试题推荐
BenjieGoodheartisinhislate30s,adoreshispartnerandhasayoungson.Butthethoughtofmarriagehasparalyzedhimwith
Itisgenerallyacceptedthatpeopleshouldvisittheiragedparentsregularlyiftheyliveseparately.Butwhetherthisrequire
Singles’Dayhasbeenhailedasanothervictorybymodernsocietyintermsofcommercialism.Businessmenviewitasagoldmine
WhenIwasinmyearlyteens,Iwastakentoaspectacularshowonicebythemotherofafriend.Lookedroundattheluxuryof
Theabilitytocommunicateistheprimaryfactorthatdistinguisheshumanbeingsfromanimals.Anditistheabilitytocommunic
WhenscientistsattheAustralianInstituteofSportrecentlydecidedtochecktheVitaminDstatusofsomeofthatcountry’sel
PASSAGETHREEWhat’sthepurposeinwritingthepassage?
Threeblindmenwereexploringanelephant.Thefirstofthem,whohappenedtoreachtheleg,describedtheelephantlikesometh
A、Howtoimprovemedicalfacilities.B、Howtofightagainstnewinfectiousdiseases.C、Howtopromotevaccinesforepidemics.D、
Thesuddenchangeofweather______ourholidayplan.
随机试题
牙萌出特点中叙述错误的是
急诊护士在抢救过程中,正确的是
属于进口设备到岸价内容的有()。
在企业中,对员工进行培训与开发最终是( )的责任。
()不是唐代诗人李白的作品。
为了加强艾滋病预防意识、普及艾滋病预防知识、提高艾滋病预防能力,市卫生部门计划在世界艾滋病日开展预防艾滋病宣传活动。假如这个宣传活动由你负责,请你制订三个宣传主题,并选取其中一个主题,谈谈你将如何开展宣传工作。
现有语文课本42册,数学课本112册,自然课本70册,平均分成若干堆,任意两堆中同种课本的数量相等,问最多能分几堆?
Cultureshockmightbecalledan【C1】______diseaseofpeoplewhohavebeensuddenly【C2】______abroad.Likemostailments,ithasi
SprainedAnkleOneofthemostcommoninjuriesteenagersandadultsexperienceisasprainedankle.Asprainoccurswhenthe
Whichofthefollowingstatementsistrueaccordingtowhatyouhaveheard?
最新回复
(
0
)