大学英语四级标准试卷..

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1、新编大学英语四级考试模拟试卷(一)PartⅠWriting(30minutes)Directions:Forthispart,youareallowed30minutestowriteashortessayentitledUniversityStudentsShouldBeEncouragedtoPayTheirTuition.Youshouldwriteatleast120wordsfollowingtheoutlinegivenbelow：1.大学生的学费大多由家长支付2.有人认为应该鼓励大学生自付学费3.你的观点注意：此部分试题在答题卡1上。PartIIRe

2、adingComprehension(SkimmingandScanning)(15minutes)Directions:Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestionsonAnswerSheet1.Forquestions1-7,markY(forYES)ifthestatementagreeswiththeinformationgiveninthepassage;N(forNO)ifthestatementcontradictstheinformation

3、giveninthepassage;NG(forNOTGIVEN)iftheinformationisnotgiveninthepassage.Forquestions8-10,completethesentenceswiththeinformationgiveninthepassage.WirelessPowerScientistshavetriedtodevelopmethodsofwirelesspowertransmissionthatcouldcuttheclutterorleadtocleansourcesofelectricity.Whilethei

4、deamaysoundfuturistic,itisn'tparticularlynew.NicolaTeslaproposedtheoriesofwirelesspowertransmissioninthelate1800sandearly1900s.OneofhismorespectaculardisplaysinvolvedremotelypoweringlightsinthegroundathisColoradoSpringsexperimentstation.Tesla'sworkwasimpressive,butitdidn'timmediatelyl

5、eadtowidespread,practicalmethodsforwirelesspowertransmission.Sincethen,researchershavedevelopedseveraltechniquesformovingelectricityoverlongdistanceswithoutwires.Someexistonlyastheoriesorprototypes,butothersarealreadyinuse.Ifyouhaveanelectrictoothbrush,forexample,youprobablytakeadvant

6、ageofonemethodeveryday.Atoothbrush'sdailyexposuretowatermakesatraditionalplug-inchargerpotentiallydangerous.Ordinaryelectricalconnectionscouldalsoallowwatertoseepintothetoothbrush,damagingitscomponents.Becauseofthis,mosttoothbrushesrechargethroughinductivecoupling.Inductivecouplinguse

7、smagneticfieldsthatareanaturalpartofcurrent'smovementthroughwire.Anytimeelectricalcurrentmovesthroughawire,itcreatesacircularmagneticfieldaroundthewire.Bendingthewireintoacoilamplifiesthemagneticfield.Themoreloopsthecoilmakes,thebiggerthefieldwillbe.Ifyouplaceasecondcoilofwireinthemag

8、netic