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
A scientific discovery is often made 【C1】______ before someone is able to put it to use. 【C2】______ , scientists discovered how
admin
2010-03-19
47
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
此题考查介词的用法。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://kaotiyun.com/show/QZ9K777K
0
专业英语四级
相关试题推荐
Whydoesthewritersuggestthatyoushoulddotheworkyourself?.
InBritain,withinthelifetimeofalltheoldpeoplealivetoday,ourlifeexpectancyhasrapidlyshotupfromanaverageoffo
AllAmericansareatleastvaguely【C1】______withtheplightoftheAmericanIndian.CutbacksinfederalprogramsforIndiansha
AllAmericansareatleastvaguely【C1】______withtheplightoftheAmericanIndian.CutbacksinfederalprogramsforIndiansha
Insurancecompaniesprovideaservicetothecommunitybyprotectingitagainstexpectedandunexpecteddisasters.Beforeanins
Theagreementcomesonthefirstdayofrenewedpeacetalksbetweenallsidesinthe_________civilwar.
Reportersandphotographersaliketookgreat_________attherudewaytheactorbehavedduringtheinterview.
WEATHERREPORTForecastsforsomemajorChinesecitiesForeigncitiesCityMax Min Weath
NowadayspeoplehavemucheasieraccesstotheInternet.Thingsbecomequitedifferent:manyjobscanbedonemuchmoreefficien
Whenyouthinkofthetremendoustechnologicalprogresswehavemade,it’samazinghowlittlewehavedevelopedinotherrespect
随机试题
严重腹泻可引起
可出现“三凹征”的病人是
建设项目管理与企业管理同属于管理活动的范畴,但从建设项目管理的内涵可以看出,两者有着明显的区别,其区别包括( )几个方面。
会计处理方法包括会计确认、计量、记录和报告四个方面。()
操作风险评估通常从()两个角度开展。
小华月投资1万元,报酬率为6%,10年后累计多少元钱?()
在南山的羊群中公母的比例是55:45,而在西山的羊群中公母的比例是65:35。在尚未有生育能力的羊群中,公的略多于母的,但是,在较年长的羊群中,公的却远多于母的。由于成年的公羊远多于未成年的公羊,我们可以推断:在总体上性别比例差距越大,羊群中较年长的公羊所
陶冶教育法
近期,曾经让不少学生头疼的汉字听写测试火了——《汉字英雄》和《中国汉字听写大会》这两档电视节目,不仅将“听写课”开到了电视上,还让告别校园多年的成年人也甘当“陪考”,老老实实地学起了写字。其实中国的汉字源远流长,每个汉字的由来都有深刻的底蕴,例如“比”“从
下列运算符函数中肯定不属于类FunNumber的成员函数的是()。
最新回复
(
0
)