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
35
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】______ .
【C7】
选项
A、is
B、signals
C、stands for
D、indicates
答案
C
解析
此题考查动词的用法。英文中说一个缩写词或者一个字母“表示”一个词,用stand for。例如:I know your name is Dean E Bella,but what does E stand for?又如:BBC stands for the“British Broadcasting Corporation”.(BBC的全称是British Broadcasting Corporation)。所以,只有C项符合题意。
转载请注明原文地址:https://kaotiyun.com/show/1E6K777K
0
专业英语四级
相关试题推荐
Tolive,learn,andworksuccessfullyinanincreasing【S1】______complexandinformation-richsociety,studentsmustbeable
ComputerCrimeI.IntroductionCurrentsituation:theincreaseinthenumberandtypesofcomputercrimeII.【T1】______
BenjieGoodheartisinhislate30s,adoreshispartnerandhasayoungson.Butthethoughtofmarriagehasparalyzedhimwith
A、Observinganexpertdothejob.B、Goingonspecialtrainingcourses.C、Doingthejobundersupervision.D、Receivingpackageco
A、Computer.B、Art.C、Mathematics.D、Naturalsciences.B细节题。本题考查考生对第二个被访者身份的了解,根据采访,Jean是艺术老师:Jean,introducingcomputersintothe
MulticulturalEducation:PiecingTogetherthePuzzleToday,we’lldiscussanewfieldofeducation—multiculturaleducation.
Childrentodayspendmoretimestareatcomputer【S1】______andTVscreensbothatschoolandathome.Scientific【S2】______
WhenscientistsattheAustralianInstituteofSportrecentlydecidedtochecktheVitaminDstatusofsomeofthatcountry’sel
Beyonddemographics,theUnitedStatesconfrontswitharangeofother【M1】______challenges.Globalizationisonthetopoftha
Massivechangesinalloftheworld’sdeeplycherishedsportinghabitsareunderway.Whetherit’soneofLondon’sparksfullof
随机试题
Becauseoftheirfrequentwars,manyoftheirinventionswerenomorethanimprovementsinthedesignofGreekweaponswithwhic
女性,23岁。近两月来轻咳,痰中带血丝,午后手足心发热、盗汗、心悸。胸片右上肺第三前肋以上有云絮状阴影,其中并有圆形透明区。以下哪项检查对明确诊断最有意义
可导致驾驶员多尿或多汗的药物是()
北京某房地产公司与天津某建材公司签订了一份建材采购合同,总金额为20万元。合同签订后1个月,由于建材市场价格上涨,建材公司通知房地产公司加价50%,否则将解除合同。房地产公司遂向人民法院起诉。法院立案后,立即向被告发出通知。被告建材公司在答辩期内提交了答辩
根据采购人的组织管理架构特点,集中采购可以分为多种采购组织实施模式,具体包括()。
A公司主营业务是产品制造与销售,2010年其产品销售收入为5亿元,销售成本为3.6亿元,2010年期初存货为1120万元,期末存货为880万元,则该公司2010年存货周转天数为()天。
大规模定制:根据客户的个性化需求,以大批量牛产的低成本、高质量和效率等特点提供定制产品和服务的生产方式。根据定义,以下属丁大规模定制的是()。
2021年6月,《中国新型政党制度》白皮书发布。根据该白皮书,中国新型政党制度发展于()。
单链表的每个结点中包括一个指针link,它指向该结点的后继结点。现要将指针q指向的新结点插入到指针p指向的单链表结点之后,下列操作序列中正确的是()。
Access中将一个或多个操作构成集合,每个操作能实现特定的功能,则称该操作集合为()。
最新回复
(
0
)