英语全套试题3.docx
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英语全套试题3.docx
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英语全套试题3
大学英语四级新题型预测模拟试卷(三)
大学英语4级考试
CollegeEnglishModelTestThree
—BandFour—
PartⅠWriting(30minutes)
Directions:
Forthispart,youareallowedthirty minutestowritealettertoyourAmericanfriend Lawrence,tointroduceSpringFestivalinChinaand invitehimtojoinyoutospendthisSpringFestival. SupposeyouareYuanChao.Youshouldwriteatleast 120wordsfollowingthesuggestionsgivenbelowin Chinese:
1.表达你对Lawrence的想念之情;
2.介绍中国的春节;
3.邀请Lawrence和你们一起过春节。
提示:
在实考试卷中,该试题在答题卡1上。
ALettertoLawrence
September23,2005
DearLawrence,
Yours,
YuanChao
WatchoutforFallingSatellites
Whatishappening?
Anout-of-controlUSspysatellitewillcrashtoEarthinthecomingmonths,governmentofficialssay.Thesatelliteislargeenoughthatdebris(残骸)arelikelytosurviveatmosphericre-entryandstriketheEarth,sometimeinlateFebruaryorearlyMarch,saysGordonJohndroe,aspokesmanfortheNationalSecurityCouncil.
Isthatnormal?
“Thisisrelativelyroutineinthatsatellitesdeorbitallthetime,”saysJohndroe.Piecesofuncontrolleddebrisheavierthantwotonnes—mostlydiscardedrocketstages—crashtoEarthasoftenasonceeverythreeweeks,saysJonathanMcDowell,anastronomerandlaunchobserverattheHarvard-SmithsonianCenterforAstrophysicsinCambridge,Massachusetts.Manydiscardedpiecesretainsomepower,sothatcontrollersonEarthcanguidethemtoapointfarfromhumanhabitation,usuallyusingafinaldiveintoanocean.
In2001,RussianspaceofficialsbrokeuptheoldMirspacestationinthiswayovertheSouthPacific.That’snotthecaseforthisUSone,however.
“Obviously,wewanttotakealookatthepotentialforittolandinapopulatedarea,”saysJohndroe.“Asbackground,I’dliketosaythatoverthepast30plusyears,therehavebeenmanysatellitesandotherman-madeobjectsfallingfromspace—ofcourse,theyfallingwithverylittledamageandnoinjuries.Whatmakesthiscasealittlebitdifferent,however,andinparticularforthepresidentinhisconsideration,wasthelikelihoodthatthesatellite,upondescenttotheEarth’ssurface,couldreleasemuchofitsthousand-pluspoundsofhydrazine(联氨)fuelasatoxicgas.”
Whatarethechancesofitcrashingthroughmyroof?
Exceedinglyslim,saysMcDowell.Rememberthatsome70%oftheEarthiswater,andmostlandsarevoidofpeople.“Thereisnoreasonforpeopletogetalarmedaboutit,”hesays.
AccordingtotheNASAOrbitalDebrisProgramOffice,therehavebeennoconfirmedinstancesofseriouspropertydamageorinjurycausedbycrashingdebrisin40years.Thelikelihoodofthesatellitefallinginapopulatedareaissmall,andtheextentanddurationoftoxichydrazineintheatmospherewouldbequitelimited;nevertheless,ifthesatellitedidfallinapopulatedarea,therewasapossibilityofdeathorinjurytohumanbeingsbeyondthatassociatedwiththefallofsatellitesandotherspaceobjectsnormally,ifwecanusethatword.Specifically,therewasenoughofariskforthepresidenttobequiteconcernedabouthumanlife,andonthatbasis,heasksustoreviewouroptions.
Whatisthissatellite?
Sinceitisaspysatellite,thisisn’tpublicinformation.ButitislikelytobeUSA193,which,accordingtonewsreports,waslaunchedattheendof2006fortheNationalReconnaissanceOffice(NRO)andwhichwaslosttoground-basedcontrollersuponreachingorbit.Atthetime,amateurskywatchersnoticedthatitsorbitwasslightly‘off’andwasn’tbeingcorrected.Basedontheslightlossesinaltitude,theyhadpredictedaneventualcrashthisspring,McDowellsays.
IfthedyingsatelliteisindeedUSA193,itsspecificationscanbebetterdefined.USA193waslaunchedonaBoeingDelta2rocket,whichlimitsthesizeofthesatellitetobetweentwoandfourtonnesandfiveorsixmetersinlength—aboutthesizeofaminivan,McDowellsays.Thissatelliteisnowatanaltitudeof250kilometersandisfallingakilometerperday.Itorbitsinthemid-latitudes,between58degreesnorthandsouth.Whereitwillfallwithinthatrangeisimpossibletoknownow,soMcDowellsaysthechanceoflandingintheUnitedStates,forexample,is2%,basedonarea.Betterestimatesshouldbeavailableadaybeforelanding.
Isthe“minivan-sized”satelliteabigone?
Nowherenearasbigasasatellitethatfelluncontrollablyin1979:
themore-than-70-tonneUSSkylabIcrashedthroughtheatmosphereandscattereddebrisacrosstheIndianOceanandWesternAustralia.
Whatwillhappentothisoneonentry?
Theatmospherewilltearupthesatellite.Aluminiumpartsandouterlayerswillburn.Twistedchunksofheavierpieces,likethefueltank,couldsurvive.McDowellsaysthatthesatellitecouldcontainasmuchasatonneofhydrazine,ahighlytoxicpropellant(燃料)whichcouldbehazardoustobenearbutnotdangerouswhendispersedintheatmosphere.
Havebitsofsatellitessurvivedre-entryintactbefore?
Yes.TheNASAOrbitalDebrisProgramOfficehostssomepicturesofprettybigchunks,including:
a250-kilogramsteelfueltankanda30-kilogramtitanium(钛)tankofalaunchvehiclethatbothlandedinTexasin1997,anda70-kilogramtitaniumrocketmotorcasingthatlandedinSaudiArabiain2001.Onenoteworthyill-fatedsatelliteactuallycrash—landedthroughtheroofofaworkshopsupportingitslaunchin2006,havingfallenfromabotched(拙劣的)take-off.
Howmanythingsaretherethatcouldpotentiallyfalloutoforbit?
TheNASAOrbitalDebrisProgramOfficesaystherearesome11,000objectsbiggerthan10centimeterstrackedbytheUSSpaceSurveillanceNetwork.Ofcourse,thebiggestman-madeobjectinthesky,byfar,istheInternationalSpaceStation.Nearly45meterslongandmorethan200tonnesheavy,theconcernabouttheISSisinprotectingitfromdebris,ratherthanworryingaboutitbecomingdebrisitself.
Ifitlandsinthemiddleofnowhere,doesitmatter?
Whiletheimpactislikelytobeanonevent,thefallingsatellitedoesserveasareminderthattheNRO—theUnitedStates“eyesandearsinspace”—ishavingabadtimeofthings.In2005,theNROcancelledanext-generationreconnaissance(侦察)technologyproject,calledFutureImageryArchitecture,afterBoeinghadspentmorethan$4billiononit,accordingtotheNewYorkTimes.“TheNROhashadabaddecade,”saysJeffreyLewis,aspacepolicyanalystattheNewAmericaFoundationinWashingtonDC.“Weknewthissatellitehasbeendeadforalongtime.Butitremindsusofhowmuchtroublethey’vehad.”
1.WhenwillthedisabledUSspysatellitecrashtoEarth?
A)SometimeinnextMarch.B)PerhapsinnextFebruary.
C)OnthefirstdayofFebruary.D)MaybeinearlyMarch.
2.McDowellsaysthatmostoftheheaviestuncontrolleddebriscrashingtoEarth______.
A)aresatelliteswhichhavedeorbited
B)arethendiscardedinthreeweeks
C)comefromrocketlaunchings
D)stillhavepowertouse
3.WhydoesJohndroesaythatthecomingcrashofthespysatelliteisdifferent?
A)Itwillbringverylittledamage.
B)Itmayreleasemuchtoxicgas.
C)Itmaylandinapopulatedarea.
D)Ithasbotheredthepresident.
4.HowwouldMcDowellliketheideathatpeopleshouldbewarnedofthecomingcrash?
A)Itisagoodidea.
B)Itisreasonable.
C)Itisuseless.
D)Itisunnecessary.
5.WhohadpredictedthecrashofUSA193beforethegovernmentuncoveredit?
A)Amateurskywatchers.
B)JonathanMcDowell.
C)GordonJohndroe.
D)Ground-basedcontrollers.
6.WhatdoweknowaboutthesatelliteUSA193?
A)Itisfiveorsixmeterslong.
B)Itisofthesameshapeofasmallvan.
C)ItisverylikelytolandinAmerica.
D)Itismorethan70tonnes.
7.Whichpartofthedyingsatellitecouldsurviveatmosphericre-entry?
A)TheAluminiumparts.
B)Thepropellantcontainer.
C)Theouterlayers.
D)The250-kilogramsteelfueltank.
8.AccordingtoMcDowell,thepropellantofUSA193satellitecouldloseitstoxicitywhenitis.
9.ToprotecttheISS,theUSSpaceSurveillanceNetworkshouldtrytokeepitfrom.
10.ThedeadandfallingUSspysatelliteremindspeoplethattheNROisinbignow.
Directions:
Inthissection,thereisapassagewithtenblanks.Youarerequiredtoselectonewordforeachblankfromalistofchoicesgiveninawordbankfollowingthepassage.Readthepassagethroughcarefullybeforemakingyourchoices.Eachchoiceinthebankisidentifiedbyaletter.PleasemarkthecorrespondingletterforeachitemonAnswerSheet2withasinglelinethroughthecentre.Youmaynotuseanyofthewordsinthebankmorethanonce.
Questions47to56arebasedonthefollowingpassage.
WhatisitaboutAmericansandfood?
Welovetoeat,butwefeel
47aboutitafterward.Wesaywewantonlythebest,butwestrangelyenjoyjunkfood.We’re48withhealthandweightlossbutfaceanunprecedentedepidemicofobesity(肥胖).Perhapsthe49tothisambivalence(矛盾情结)liesinourhistory.ThefirstEuropeanscametothiscontinentsearchingfornewspicesbutwentinvain.Thefirstcashcrop(经济作物)wasn’teatenbutsmoked.ThentherewasProhibition,intendedtoprohibitdrinkingbutactuallyencouragingmore50waysofdoingit.
Theimmigrantexperience,too,hasbeenoneofinharmony.DoasRomansdomeanseatingwhat“realAmericans”eat,butournation’sfoodhascometobe
51byimports—pizza,say,orhotdogs.Andsomeofthecountry’smosttreasuredcookingcomesfrompeoplewhoarrivedhereinshackles.
Perhapsitshouldcomeasnosurprisethenthatfoodhasbeenamediumforthenation’sdefiningstruggles,whetherattheBostonTeaPartyorthesitinsatsouthernlunchcounters.Itisintegraltoourconceptsofhealthandevenmoralitywhetheronerefrainsfromalcohol
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