大学英语四级考试模拟题.docx
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大学英语四级考试模拟题.docx
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大学英语四级考试模拟题
2019年大学英语四级考试模拟题
PartⅢReadingComprehension(40minutes)
SectionA
Directions:
Inthissection,thereisapassagewithtenblanks.Youarerequiredtoselectonewordforeachblankfromalistofchoicesgiveninawordbankfollowingthepassage.Readthepassagethroughcarefullybeforemakingyourchoices.Eachchoiceinthebankisidentifiedbyaletter.PleasemarkthecorrespondingletterforeachitemonAnswerSheet2withasinglelinethroughthecentre.Youmaynotuseanyofthewordsinthebankmorethanonce.
Questions26to35arebasedonthefollowingpassage.
Afewmonthsago,Iwasdownwithaterriblecoldwhichendedwithapersistentbadcough.Nomatterhowmanydifferent26Itried,Istillcouldn’tgetridofthecough.Notonlydidit27myteachingbutalsomylifeasawhole.Thenonedayafterclass,astudentcameuptomeand28traditionalChinesemedicine.Fromherdescription,Chinesemedicinesoundedasifithadmagicpowerthatworkedwonders;Iwas29aboutitbecauseIknewsolittleaboutitandhavenevertrieditbefore.Eventually,mycoughgotsomuch30thatIcouldn’tsleepatnight,soIdecidedtogiveitatry.TheChinesedoctortookmypulseandaskedtoseemytongue,bothofwhichwerenew31tomebecausetheyarebothnon-existentinWesternmedicine.Thenthedoctorgavemeascrapping(刮)treatmentknownas‘GuaSha’.Iwasalittle32atfirstbecauseheusedasmoothedgedtooltoscrapetheskinonmyneckandshoulders.Afewminuteslater,the33strokesstartedtoproducearelievingeffectandmybodyandmindbeganto34deeperintorelaxation.
Ididn’tfeelanyimprovementinmyconditioninthefirstcoupleofdays,butafterafewmoreregularvisitstothedoctor,mycoughstartedto35.then,withinamatterofweeks,itwascompletelygone!
A)deepenE)lessenI)remediesM)temporary
B)experiencesF)licensesJ)scaredN)tremble
C)hesitantG)pressuredK)sensitiveO)worse
D)inconvenienceH)recommendedL)sink
SectionB
Directions:
Inthissection,youaregoingtoreadapassagewithtenstatementsattachedtoeachstatementcontainsinformationgiveninoneoftheparagraphs.Identifytheparagraphfromwhichtheinformationisderived.Youmaychooseaparagraphmorethanonce.Eachparagraphismarkedwithaletter.AnswerthequestionsbymarkingthecorrespondingletteronAnswerSheet2.
IsitreallyOKtoeatfoodthat’sfallenonthefloor?
[A]Whenyoudropapieceoffoodonthefloor,isitreallyOKtoeatyoupickitupwithinfiveseconds?
Anurbanfoodmythcontendsthatiffoodspendsjustafewsecondsonthefloor,dirtandgermswon’thavemuchofachancetocontaminateit.Researchinmylabhasfocusedonhowfoodbecomescontaminated,andwe’vedonesomeworkonthisparticularpieceofwisdom.
[B]Whilethe“five-secondrule”mightnotseemlikethemostpressingissueforfoodscientiststogettothebottomof,it’sstillworthinvestigatingfoodmythslikethisonebecausetheyshapeourbeliefsaboutwhenfoodissafetoeat.
[C]Soisfivesecondsonthefloorthecriticalthreshold(门槛)thatseparatesapieceofeatablefoodfromacaseoffoodpoisoning?
It’sabitmorecomplicatedthanthat.Itdependsonjusthowmanybacteriacanmakeitfromfloortofoodinafewsecondsandjusthowdirtytheflooris.
[D]WonderingiffoodisstillOKtoeatafterit’sdroppedonthefloorisaprettycommonexperience.Andit’sprobablynotanewoneeither.Awell-known,butinaccurate,storyaboutJuliaChildmayhavecontributedtothisfoodmyth.Someviewersofhercookingshow,TheFrenchChef,insisttheysawChilddroplambonthefloorandpickitup,withtheadvicethatiftheywerealonginthekitchen,theirguestswouldneverknow.
[E]Infactitwasapotatopancake,anditfellonthestovetop,notonthefloor.Childputitbackinthepain,saying.“Butyoucanalwayspickitupandifyou’realoneinthekitchen,who’sgoingtoseeit?
”Butthemisrememberedstorypersists.It’shardertopindowntheoriginsoftheoft-quotedfive-secondrule,buta2003studyreportedthat70%ofwomenand56%ofmensurveyedwerefamiliarwiththefive-secondruleandthatwomenweremorelikelythanmentoeatfoodthathaddroppedonthefloor.
[F]Sowhatdoessciencetellusaboutwhatafewmomentsonthefloormeansforthesafetyofyourfood?
Theearliestresearchreportonthefive-secondruleisattributedtoJillianClarke,ahighschoolstudentparticipatinginaresearchapprenticeshipattheUniversityofIllinois.Clarkeandhercolleaguesinoculatedfloortileswithbacteriathenplacedfoodonthetilesforvaryingtimes.Theyreportedbacteriaweretransferredfromthetiletogummybearsandcookieswithinfiveseconds,butdidn’treportthespecificamountofbacteriathatmadeitfromthetiletothefood.
[G]Buthowmuchbacteriaactuallytransferinfiveseconds?
In2007,mylabatClemsonUniversitypublishedastudy–theonlypeer-reviewedjournalpaperonthistopic–intheJournalofAppliedMicrobiology.Wewantedtoknowifthelengthoftimefoodisincontactwithacontaminatedsurfaceaffectedtherateoftransferofbacteriatothefood.Tofindout,weinoculatedsquaresoftile,carpetorwoodwithSalmonella.Fiveminutesafterthat,weplacedeitherbolognaorbreadonthesurfacefor5,30or60seconds,andthenmeasuredtheamountofbacteriatransferredtothefood.Werepeatedthisexactprotocolafterthebacteriahadbeenonthesurfacefortwo,four,eightand24hours.
[H]Wefoundthatthenumberofbacteriatransferredtoeitherkindoffooddidn’tdependmuchonhowlongthefoodwasincontactwiththecontaminatedsurface—whetherforafewsecondsorforawholeminute.Theoverallamountofbacteriaonthesurfacematteredmore,andthisdecreasedovertimeaftertheinitialinoculation.Itlookslikewhat’satissueislesshowlongyourfoodstaysonthefloorandmuchmorehowcontaminatedwithbacteriathatpatchoffloorhappenstobe.
[I]Wealsofoundthatthekindofsurfacemadeadifferenceaswell.Carpets,forinstance,seemtobeslightlybetterplacestodropyourfoodthanwoodortile.WhencarpetwasinoculatedwithSalmonella,lessthan1%ofthebacteriaweretransferred.Butwhenthefoodwasincontactwithtileorwood,48%-70%ofbacteriatransferred.
[J]Lastyear,astudyfromAstonUniversityintheUKusednearlyidenticalparameters(参数)toourstudyandfoundsimilarresultstestingcontacttimesofthreeand30secondsonsimilarsurfaces.Theyalsoreportedthat87%ofpeopleaskedeitherwouldeatorhaveeatenfooddroppedonthefloor.
[K]Shouldyoueatfoodfallenonthefloorthen?
Fromafoodsafetystandpoint,youhavemillionsormorebacteriaonasurface,0.1%isstillenoughtomakeyousick.Also,certaintypesofbacteriaareextremelyharmfulandittakesonlyasmallnumbertomakeyousick.Forexample,10bacteriaorlessofanespeciallydeadlystrainofbacteriacancausesevereillnessanddeathinpeoplewithcompromisedimmunesystems.Butthechanceofthesebacteriabeingonmostsurfacesisverylow.
[L]Andit’snotjustdroppingfoodonthefloorthatcanleadtobacterialcontamination.Bacteriaarecarriedbyvarious“media,”whichcanincluderawfood,moistsurfaceswherebacteriahasbeenleft,ourhandsorskinandfromcoughingorsneezing.Hands,foodsandutensilscancarryindividualbacterialcells,coloniesofcellsorcellslivingincommunitiescontainedwithinaprotectivefilmthatprovideprotection.Thesemicroscopiclayersofdepositscontainingbacteriaareknownasbiofilmsandtheyarefoundonmostsurfacesandobjects.Biofilmcommunitiescanharborbacterialongerandareverydifficulttoclean.Bacteriainthesecommunitiesalsohaveanenhancedresistancetosanitizersandantibioticscomparedtobacterialivingontheirown.
[M]Sothenexttimeyouconsidereatingdroppedfood,theoddsareinyourfavorthatyoucaneatthatmorselandnotgetsick.Butintherarechancethathereisamicroorganismthatcanmakeyousickontheexactspotwherethefooddropped,youcanbefairlysurethebugisonthefoodyouareabouttoputinyourmouth.
[N]Researchorcommonsensetellsusthatthebestthingtodoistokeepyourhandsandothersurfacesclean.
36.Aresearchprojectfoundbacteriamadetheirwaytothefoodonthefloorinfiveseconds.
37.Whetherfoodiscontaminateddependsmuchonthenumberofbacteriathatgetontoit.
38.Foodcontaminationmayresultfromvariousfactorsotherthanfooddroppingonthefloor.
39.Malesarelesslikelythanfemalestoeatfoodthatmayhavebeencontaminated.
40.Theauthor’sresearchcenteraroundhowfoodgetscontaminated.
41.Keepingeverythingcleanisthebestwaytostayhealthy.
42.Chancesareyouwillnotfallsickbecauseofeatingfoodpickedupfromthefloor.
43.Foralongtimepeoplehavehadtheexperienceofdecidingwhetherornottoeatfoodpickedupfromthefloor.
44.Somestrainsofbacteriaaresoharmfulthatatinyfewcanhavedeadlyconsequences.
45.Researcherfoundhowmanybacteriagetontothefooddidnothavemuchtodowithhowlongthefoodstayedonacontaminatedfloor.
SectionC
Directions:
Thereare2passagesinthissection.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).YoushoulddecideonthebestchoiceandmarkthecorrespondingletteronAnswerSheet2withasinglelinethroughthecentre.
PassageOne
Questions46to50arebasedonthefollowingpassage.
Thelatestincatresearchrevealsthatthelovelyanimalseemstohaveabasicgrasponboththelawsofphysicsandtheinsandoutsofcauseandeffect.
Accord
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