专业英语-阅读理解分类题练习十一

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1、阅读理解分类题练习计Test1TEXTAThewordanacronymforLightAmplificationbytheOrdinarylight,fromtheSunoralightInthissectiontherearefourpassagesfollowedbyquestionsorunfinishedstatements,eachwithfoursuggestedanswersmarkedA,B,CandD.Choosetheonethatyouthinkisthebestanswer.Markyouranswersonyouranswershee

2、t•nlasernwascoinedasStimulatedEmissionofRadiation.bulb,isemittedspontaneously,whenatomsormoleculesgetridofexcessenergybythemselves,withoutanyoutsideintervention•Stimulatedemissionisdifferentbecauseitoccurswhenanatomormoleculeholdingontoexcessenergyhasbeenstimulatedtoemititaslight•Alb

3、ertEinsteinwasthefirsttosuggesttheexistenceofstimulatedemissioninapaperpublishedin1917.However,formanyyears,physiciststhoughtthatatomsandmoleculesalwaysweremuchmorelikelytoemitlightspontaneouslyandthatstimulatedemissionthusalwayswouldbemuchweaker

4、atphysicistsbegantryingtomakestimulatedemissiondominate•Theysoughtwaysbywhichoneatomormoleculecouldstimulatemanyotherstoemitlightzamplifyingittomuchhigherpowers・ThefirsttosucceedwasCharlesH・Townes,thenatColumbiaUniversityinNewYork・工nsteadofworkingwithlight,however,heworkedwithmicrowa

5、ves,whichhaveamuchlongerwavelength,andbuiltadevicehecalledanmaserH,forMicrowaveAmplificationbytheStimulatedEmissionofRadiation.Althoughhethoughtofthekeyideain1951,thefirstmaserwasnotcompleteduntilacoupleofyearslater.Beforelong,manyotherphysicistswerebuildingmasersandtryingtodiscoverh

6、owtoproducestimulatedmissionatevenshorterwavelengths•Whichofthefollowingstatementsbestdescribesalaser?A.B・C・D・Thekeyconceptsemergedabout1957.TownesandArthurSchawlow,thenatBellTelephoneLaboratories,wrotealongpaperoutliningtheconditionsneededtoamplifystimulatedemissionofvisiblelightwav

7、es.Ataboutthesametime,similarideascrystallizedinthemindofGordonGould,thena37-year-oldgraduatestudentatColumbia,whowrotethemdowninaseriesofnotebooks.TownesandSchawlowpublishedtheirideasinascientificjournal,PhysicalReviewLetters,butGouldfiledapatentapplication.Somedecadeslater,peoplest

8、illargueabou