2019年12月英语六级考试试题第1套及参考答案

2019年12月英语六级考试试 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 第1套PartIIListeningComprehension(30minutes)SectionADirections:Inthissection,youwillheartwolongconversations.Attheendofeachconversation,youwillhearfourquestions.Boththeconversationandthequestionwillbespokenonlyonce.Afteryouhearaquestion,youmustchoosethebestanswerfromthefourchoicesmarkedA),B),C)andD).ThenmarkthecorrespondingletteronAnswerSheet1withasinglelinethroughthecentre.Questions1to4arebasedontheconversationyouhavejustheard.1.A)Magazinereporter.C)Websitedesigner.B)Fashiondesigner.D)Featureseditor.2.A)Designingsportsclothing.C)Answeringdailyemails.B)Consultingfashionexperts.D)Interviewingjob-seekers.3.A)Itischallenging.C)Itistiresome.B)Itisfascinating.D)Itisfashionable.4.A)Herpersistence.C)Hercompetence.B)Herexperience.D)Herconfidence.Questions5to8arebasedontheconversationyouhavejustheard.5.A)Itisenjoyable.B)Itiseducational.C)Itisdivorcedfromreallife.D)Itisadaptedfromadrama.6.A)Alltherolesareplayedbyfamousactorsandactresses.B)Itisbasedonthereal-lifeexperiencesofsomecelebrities.C)ItsplotsandeventsrevealalotaboutFrankie'sactuallife.D)Itiswritten,directed,editedandproducedbyFrankiehimself.7.A)Gotothetheaterandenjoyit.B)Recommendittoherfriends.C)Watchitwiththeman.D)Downloadandwatchit.第1／12页8.A)Ithasdrawncriticismsfromscientists.B)Ithasbeenshowingforoveradecade.C)Itisaridiculouspieceofsatire.D)Itisagainstcommonsense.SectionBDirections:Inthissection,youwillheartwopassages.Attheendofeachpassage,youwillhearthreeorfourquestions.Boththepassageandthequestionswillbespokenonlyonce.Afteryouhearaquestion,youmustchoosethebestanswerfromthefourchoicesmarkedA),B),C)andD).ThenmarkthecorrespondingletteronAnswerSheet1withasinglelinethroughthecentre.Questions9to11arebasedonthepassageyouhavejustheard.9.A)Theyarelikelytogetinjuredwhenmovingtoofast.B)Theybelieveinteamspiritforgoodperformance.C)Theyneedtokeepmovingtoavoidgettinghurt.D)Theyhavetolearnhowtoavoidbodycontact.10.A)Theydonothavemanyyearstoliveafterretirement.B)Theytendtolivealongerlifewithearlyretirement.C)Theydonotstartenjoyinglifeuntilfullretirement.D)Theykeepthemselvesbusyevenafterretirement.11.A)Itpreventsusfromworrying.B)Itslowsdownouragingprocess.C)Itenablesustoaccomplishmoreinlife.D)Itprovidesuswithmorechancestolearn.Questions12to15arebasedonthepassageyouhavejustheard.12.A)Ittendstodwellupontheirjoyousexperiences.B)Itwandersforalmosthalfoftheirwakingtime.C)Ithastroubleconcentratingafterabraininjury.D)Ittendstobeaffectedbytheirnegativefeelings.13.A)Tofindhowhappinessrelatestodaydreaming.B)Toobservehowone'smindaffectsone'sbehavior.C)Toseewhydaydreamingimpactswhatoneisdoing.D)Tostudytherelationbetweenhealthanddaydreaming.第2／12页14.A)Ithelpsthemmakegooddecisions.B)Ithelpsthemtaptheirpotentials.C)Itcontributestotheircreativity.D)Itcontributestoclearthinking.15.A)Subjectswithcleargoalsinmindoutperformedthosewithoutcleargoals.B)Thedifferenceinperformancebetweenthetwogroupswasinsignificant.C)Non-daydreamersweremorefocusedontheirtasksthandaydreamers.D)Daydreamersdidbetterthannon-daydreamersintaskperformance.SectionCDirections:Inthissection,youwillhearthreerecordingsoflecturesortalksfollowedbythreeorfourquestions.Therecordingswillbeplayedonlyonce.Afteryouhearaquestion,youmustchoosethebestanswerfromthefourchoicesmarkedA),B),C)andD).ThenmarkthecorrespondingletteronAnswerSheet1withasinglelinethroughthecentre.Questions16to18arebasedontherecordingyouhavejustheard.16.A)TheyaretheoldestbuildingsinEurope.B)TheyarepartoftheChristiantradition.C)Theyarerenovatedtoattracttourists.D)Theyareinworseningcondition.17.A)Theyhaveahistoryof14centuries.B)Theyare40metrestallonaverage.C)Theyarewithoutfoundations.D)Theyconsistofseveralstoreys.18.A)Woodwasharmoniouswithnature.B)Woodenbuildingskeptthecoldout.C)TimberwasabundantinScandinavia.D)TheVikingslikedwoodenstructures.Questions19to21arebasedontherecordingyouhavejustheard.19.A)Similaritiesbetweenhumanbabiesandbabyanimals.B)Cognitivefeaturesofdifferentnewlybornmammals.C)Adults'influenceonchildren.D)Abilitiesofhumanbabies.第3／12页20.A)Theycandistinguishahappytunefromasadone.B)Theylovehappymelodiesmorethansadones.C)Theyfallasleepeasilywhilelisteningtomusic.D)Theyarealreadysensitivetobeatsandrhythms.21.A)Infants'facialexpressions.B)Babies'emotions.C)Babies'interactionwithadults.D)Infants'behaviors.Questions22to25arebasedontherecordingyouhavejustheard.22.A)Itmayharmthecultureoftoday'sworkplace.B)Itmayhinderindividualcareeradvancement.C)Itmayresultinunwillingnesstotakerisks.D)Itmayputtoomuchpressureonteammembers.23.A)Theycanhardlygiveexpressiontotheiroriginalviews.B)Theycanbecomelessmotivatedtodoprojectsoftheirown.C)Theymayfindithardtogettheircontributionsrecognized.D)Theymayeventuallylosetheirconfidenceandcreativity.24.A)Theycanenlargetheirprofessionalcircle.B)Theycangetchancestoengageinresearch.C)Theycanmakethebestuseoftheirexpertise.D)Theycancompletetheprojectmoreeasily.25.A)Itmaycauselotsofargumentsinateam.B)Itmaypreventmakingatimelydecision.C)Itmaygiverisetoalotofunnecessaryexpenses.D)Itmaydepriveateamofbusinessopportunities.PartIIIReadingComprehension(40minutes)SectionADirections:Inthissection,thereisapassagewithtenblanks.Youarerequiredtoselectonewordforeachblankfromalistofchoicesgiveninawordbankfollowingthepassage.Readthepassagethroughcarefullybeforemakingyourchoices.Eachchoiceinthebankisidentifiedbyaletter.PleasemarkthecorrespondingletterforeachitemonAnswerSheet2withasinglelinethroughthecentre.Youmaynotuseanyofthewordsinthebankmorethanonce.第4／12页Whenconsideringriskfactorsassociatedwithsenouschronicdiseases,weoftenthinkabouthealthindicatorssuchascholesterol,bloodpressure,andbodyweight.Butpoordietandphysicalinactivityalsoeachincreasetheriskofheartdiseaseandhavearoletoplayinthedevelopmentofsomecancers.Perhapsworse,the26effectsofanunhealthydietandinsufficientexercisearenotlimitedtoyourbody.Recentresearchhasalsoshownthat27inahigh-fatandhigh-sugardietmayhavenegativeeffectsonyourbrain,causinglearningandmemory28Studieshavefoundobesityisassociatedwithimpainnentsincognitivefunctioning,as29byarangeoflearningandmemorytests,suchastheabilitytorememberalistofwordspresentedsomeminutesorhoursearlier.Thereisalsoagrowingbodyofevidencethatdiet-inducedcognitiveimpainnentscanemerge30-withinweeksorevendays.Forexample,onestudyfoundhealthyadults31toahigh-fatdietforfivedaysshowedimpairedattention,memory,andmoodcomparedwithalow-fatdietcontrolgroup.Anotherstudyalsofoundeatingahigh-fatandhigh­sugarbreakfasteachdayforaslittleasfourdaysresultedinproblemswithlearningandmemory32tothoseobservedinoverweightandobeseindividuals.Bodyweightwasnothugelydifferentbetweenthegroupseatingahealthydietandthoseonhighfatandsugardiets.Sothisshowsnegative33ofpoordietaryintakecanoccurevenwhenbodyweighthasnotchanged34.Thus,bodyweightisnotalwaysthebestindicatorofhealthandathinpersonstillneedstoeatwellandexercise35A)assessedI)excellingB)assignedJ)indulgingC)consequencesK)loopholesD)conspicuouslyL)rapidlyE)deficitsM)redundantF)designatedN)regularlyG)detrimental0)similarH)digestionSectionBDirections:Inthissection,youaregoingtoreadapassagewithtenstatementsattachedtoit.Eachstatementcontainsinformationgiveninoneoftheparagraphs.Identifytheparagraphfromwhichtheinformationisderived.Youmaychooseaparagraphmorethanonce.Eachparagraphismarkedwithaletter.AnswerthequestionsbymarkingthecorrespondingletteronAnswerSheet2.IncreasedScreenTimeandWellbeingDeclineinYouth[A]Haveyoungpeopleneverhaditsogood?Ordotheyfacemorechallengesthananypreviousgeneration?OurcurrenteraintheWestisoneofhighwealth.Thismeansminorsenjoymaterial第5／12页benefitsandlegalprotectionsthatwouldhavebeentheenvyofthoselivinginthepast.Butthereisanincreasingsuspicionthatallisnotwellforouryouth.Andoneofthemostpopularexplanations,amongsomeexpertsandthepopularmedia,isthatexcessive"screentime"istoblame.(Thisreferstoalltheattentionyoungpeopledevotetotheirphones,tabletsandlaptops.)However,thisisacontentioustheoryandsuchclaimshavebeentreatedskepticallybysomescholarsbasedontheirreadingoftherelevantdata.[B]Nowanewstudyhasprovidedanothercontributiontothedebate,uncoveringstrongevidencethatadolescentwellbeingintheUnitedStatesreallyisexperiencingadeclineandarguingthatthemostlikelycauseistheelectronicricheswehavegiventhem.Thebackgroundtothisisthatfromthe1960sintotheearly2000s,measuresofaveragewellbeingwentupintheUS.Thiswasespeciallytrueforyoungerpeople.Itreflectedthefactthatthesedecadessawaclimbingeneralstandardsoflivingandavoidanceofmasssocietaltraumaslikefull-scalewaroreconomicdeprivation.However,the"screentime"hypothesis,advancedbyresearcherssuchasJeanTwenge,isthatelectronicdevicesandexcessivetimespentonlinemayhavereversedthesetrendsinrecentyears,causingproblemsforyoungpeople'spsychologicalhealth.[C]Toinvestigate,Twengeandhercolleaguesdivedintothe"MonitoringtheFuture"datasetbasedonannualsurveysofAmericanschoolstudentsfromgrades8,10,and12thatstartedin1991.Intotal,1.1millionyoungpeopleansweredvariousquestionsrelatedtotheirwellbeing.Twenge'steam'sanalysisoftheanswersconfinnedtheearlier,well-establishedwellbeingclimb,withscoresrisingacrossthe1990s,andintothelater2000s.Thiswasfoundacrossmeasureslikeself-esteem,lifesatisfaction,happinessandsatisfactionwithindividualdomainslikejob,neighborhood,orfriends.Butaround2012thesemeasuresstartedtodecline.Thiscontinuedthrough2016,themostrecentyearforwhichdataisavailable.[D]Twengeandhercolleagueswantedtounderstandwhythischangeinaveragewellbeingoccurred.However,itisveryhardtodemonstratecausesusingnon-experimentaldatasuchasthis.Infact,whenTwengepreviouslyusedthisdatatosuggestascreentimeeffect,somecommentatorswerequicktoraisethisproblem.Theyarguedthathercausal-soundingclaimsrestedoncorrelationaldata,andthatshehadnotadequatelyaccountedforotherpotentialcausalfactors.Thistimearound,Twengeandherteammakeapointofsayingthattheyarenottryingtoestablishcausesassuch,butthattheyareassessingtheplausibilityofpotentialcauses.[E]First,theyexplainthatifagivenvariableisplayingaroleinaffectingwellbeing,thenweshouldexpectanychangeinthatvariabletocorrelatewiththeobservedchangesinwellbeing.Ifnot,itisnotplausiblethatthevariableisacausalfactor.Sotheresearcherslookedattimespentinanumberofactivitiesthatcouldplausiblybedrivingthewellbeingdecline.Lesssport,andfewer第6／12页meetingswithpeerscorrelatedwithlowerwellbeing,asdidlesstimereadingprintmedia(newspapers)and,surprisingly,lesstimedoinghomework.(Thislastfindingwouldappeartocontradictanotherpopularhypothesisthatitisourburdeningofstudentswithassignmentsthatiscausingalltheproblems.)Inaddition,moreTVwatchingandmoreelectroniccommunicationbothcorrelatedwithlowerwellbeing.Alltheseeffectsheldtrueformeasuresofhappiness,lifesatisfactionandself-esteem,withtheeffectsstrongerinthe8thandlOth-graders.[F]Next,Twenge'steamdugalittledeeperintothedataonscreentime.Theyfoundthatadolescentswhospentaverysmallamountoftimeondigitaldevices-acoupleofhoursaweek-hadthehighestwellbeing.Theirwellbeingwasevenhigherthanthosewhoneverusedsuchdevices.However,higherdosesofscreentimewereclearlyassociatedwithlowerhappiness.Thosespending10-19hoursperweekontheirdeviceswere41percentmorelikelytobeunhappythanlower-frequencyusers.Thosewhousedsuchdevices40hoursaweekormore(oneintenteenagers)weretwiceaslikelytobeunhappy.Thedatawasslightlycomplicatedbythefactthattherewasatendencyforkidswhoweresocialintherealworldtoalsousemoreonlinecommunication,butbybracketingoutdifferentcasesitbecameclearthatthereal-worldsocialitycomponentcorrelatedwithgreaterwellbeing,whereasgreatertimeonscreensoronlineonlycorrelatedwithpoorerwellbeing.[G]Sofar,soplausible.Butthenextquestionis,arethedropsinaveragewellbeinghappeningatthesametimeastrendstowardincreasedelectronicdeviceusage?Itlookslikeit-afterall,2012wasthetippingpointwhenmorethanhalfofAmericansbeganowningsmartphones.Twengeandhercolleaguesalsofoundthatacrossthekeyyearsof2013-16,wellbeingwasindeedlowestinyearswhereadolescentsspentmoretimeonline,onsocialmedia,andreadingnewsonline,andwhenmoreyouthintheUnitedStateshadsmartphones.Andinasecondanalysis,theyfoundthatwheretechnologywent,dipsinwellbeingfollowed.Forinstance,yearswithalargerincreaseinonlineusagewerefollowedbyyearswithlowerwellbeing,ratherthantheotherwayaround.Thisdoesnotprovecausality,butisconsistentwithit.Meanwhile,TVusedidnotshowthistracking.TVmightmakeyoulesshappy,butthisisnotwhatseemstobedrivingtherecentdeclinesinyoungpeople'saveragehappiness.[HJAsimilarbutreversedpatternwasfoundfortheactivitiesassociatedwithgreaterwellbeing.Forexample,yearswhenpeoplespentmoretimewithfriendswerebetteryearsforwellbeing(andfollowedbybetteryears).Sadly,thedataalsoshowedface-to-facesocializingandsportsactivityhaddeclinedovertheperiodcoveredbythesurvey.[I]ThereisanotherexplanationthatTwengeandhercolleagueswantedtoaddress:theimpactofthegreatrecessionof2007-2009,whichhitagreatnumberofAmericanfamiliesandmightbe第7／12页affectingadolescents.Thedatasettheyuseddidnotincludeeconomicdata,soinsteadtheresearcherslookedatwhetherthe2013-16wellbeingdeclinewastrackingeconomicindicators.Theyfoundsomeevidencethatsomecrudemeasures,likeincomeinequality,correlatedwithchangesinwellbeing,buteconomicmeasureswithamoredirectimpact,likefamilyincomeandunemploymentrates(whichputfamiliesintodifficulties),hadnorelationshipwithwellbeing.Theresearchersalsonotethattherecessionhitsomeyearsbeforeweseethebeginningofthewellbeingdrop,andbeforethesteepestwellbeingdecline,whichoccurredin2013.[J]Theresearchersconcludethatelectroniccommunicationwastheonlyadolescentactivitythatincreasedatthesametimepsychologicalwellbeingdeclined.Isuspectthatsomeexpertsinthefieldwillbekeentoaddressalternativeexplanations,suchasunassessedvariablesplayingaroleinthewellbeingdecline.Butthenewworkdoesgofurtherthanpreviousresearchandsuggeststhatscreentimeshouldstillbeconsideredapotentialbarriertoyoungpeople'sflourishing.36.TheyearwhenmostAmericansbeganusingsmartphoneswasidentifiedasaturningpointinyoungAmericans'levelofhappiness.37.ScoresinvariouswellbeingmeasuresbegantogodownwardamongyoungAmericansinrecentyears.38.Unfortunately,activitiesinvolvingdirectcontactwithpeople,whichcontributedtobetterwellbeing,werefoundtobeonthedecline.39.Inresponsetopastcritics,Twengeandherco-researchersstresstheyarenottryingtoprovethattheuseofdigitaldevicesreducesyoungpeople'swellbeing.40.Inthelastfewdecadesofthe20thcentury,livingstandardswentupandeconomicdepressionswerelargelyavertedintheUS.41.Contrarytopopularbelief,doinghomeworkmightaddtostudents'wellbeing.42.Theauthorbelievestheresearchers'newstudyhasgoneastepfurtherregardingtheimpactofscreentimeonwellbeing.43.Theresearchersfoundthatextendedscreentimemakesyoungpeoplelesshappy.44.Datarevealsthateconomicinequalityratherthanfamilyincomemightaffectpeople'swellbeing.45.Toomuchscreentimeiswidelybelievedtobethecauseofunhappinessamongtoday'syoungpeople.第8／12页SectionCDirections:Thereare2passagesinthissection.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).YoushoulddecideonthebestchoiceandmarkthecorrespondingletteronAnswerSheet2withasinglelinethroughthecentre.PassageOneQuestions46to50arebasedonthefollowingpassage."Thedangerousthingaboutlyingispeopledon'tunderstandhowtheactchangesus,"saysDanAriely,behaviouralpsychologistatDukeUniversity.Psychologistshavedocumentedchildrenlyingasearlyastheageoftwo.Someexpertsevenconsiderlyingadevelopmentalmilestone,likecrawlingandwalking,becauseitrequiressophisticatedplanning,attentionandtheabilitytoseeasituationfromsomeoneelse'sperspectivetomanipulatethem.But,formostpeople,lyinggetslimitedaswedevelopasenseofmoralityandtheabilitytoself-regulate.HarvardcognitiveneuroscientistJoshuaGreenesays,formostofus,lyingtakeswork.Instudies,hegavestudysubjectsachancetodeceiveformonetarygainwhileexaminingtheirbrainsinafunctionalMRImachine,whichmapsbloodflowtoactivepartsofthebrain.Somepeopletoldthetruthinstantlyandinstinctively.Butothersoptedtolie,andtheyshowedincreasedactivityintheirfrontalparietal(�M:,flal.J)controlnetwork,whichisinvolvedindifficultorcomplexthinking.Thissuggeststhattheyweredecidingbetweentruthanddishonesty-andultimatelyoptingforthelatter.Forafollow-upanalysis,hefoundthatpeoplewhoseneural(if�al.J)rewardcentresweremoreactivewhentheywonmoneywerealsomorelikelytobeamongthegroupofliars-suggestingthatlyingmayhavetodowiththeinabilitytoresisttemptation.Externalconditionsalsomatterintermsofwhenandhowoftenwelie.Wearemorelikelytolie,researchshows,whenweareabletorationaliseit,whenwearestressedandfatiguedorseeothersbeingdishonest.Andwearelesslikelytoliewhenwehavemoralremindersorwhenwethinkothersarewatching."Weasasocietyneedtounderstandthat,whenwedon'tpunishlying,weincreasetheprobabilityitwillhappenagain,"Arielysays.Ina2016studypublishedinthejournalNatureNeuroscience,Arielyandcolleaguesshowedhowdishonestyalterspeople'sbrains,makingiteasiertotellliesinthefuture.Whenpeopleutteredafalsehood,thescientistsnoticedaburstofactivityintheirarnygdala.Thearnygdalaisacrucialpartofthebrainthatproducesfear,anxietyandemotionalresponsesincludingthatsinking,guiltyfeelingyougetwhenyoulie.Butwhenscientistshadtheirsubjectsplayagame-inwhichtheywonmoneybydeceivingtheirpartner,theynoticedthenegativesignalsfromtheamygdalabegantodecrease.Notonlythat,butwhenpeoplefacednoconsequencesfordishonesty,theirfalsehoodstendedtogetevenmoresensational.Thismeansthatifyougivepeoplemultipleopportunitiestoliefortheirownbenefit,theystartwithlittlelieswhichgetbiggerovertime.第9／12页46.Whydosomeexpertsconsiderlyingamilestoneinachild'sdevelopment?A)Itshowstheyhavetheabilitytoviewcomplexsituationsfromdifferentangles.B)Itindicatestheyhaveanabilitymoreremarkablethancrawlingandwalking.C)Itrepresentstheirabilitytoactivelyinteractwithpeoplearoundthem.D)Itinvolvesthecoordinationofboththeirmentalandphysicalabilities.47.WhydoestheHarvardneuroscientistsaythatlyingtakeswork?A)Itishardtochoosefromseveraloptions.B)Itisdifficulttosoundnaturalorplausible.C)Itrequiresspeedybloodflowintoone'sbrain.D)Itinvolveslotsofsophisticatedmentalactivity.48.Underwhatcircumstancesdopeopletendtolie?A)Whentheybecometooemotional.B)Whentheyfacetoomuchpeerpressure.C)Whenthetemptationistoostrong.D)Whentheconsequencesarenotimminent.49.Whenarepeoplelesslikelytolie?A)Whentheyarewornoutandstressed.B)Whentheyareunderwatchfuleyes.C)Whentheythinkinarationalway.D)Whentheyhaveaclearconscience.50.Whatdoestheauthorsaywillhappenwhenaliardoesnotgetpunished?A)Theymayfeeljustified.B)Theywilltellbiggerlies.C)Theywillbecomecomplacent.D)Theymaymixliesandtruths.PassageTwoQuestions51to55arebasedonthefollowingpassage.Here'showthePacificNorthwestispreparingfor"TheBigOne".It'sthemotherofalldisasterdrillsforwhatcouldbetheworstdisasterinAmericanhistory.Californiahasspentyearspreparingfor"TheBigOne"-theinevitableearthquakethatwillundoubtedlyunleashallkindsofhavocalongthefamousSanAndreasfault(�;;,,).ButwhatifthefaultthatrunsalongthePacificNorthwestdeliversagiganticearthquakeofitsown?IfthepeopleoftheCascadiaregionhaveanythingtodowithit,theywon'tbecaughtunawares.第10／12页Theregionisengagedinamulti-dayearthquake-and-tsunamiUt1*)drillinvolvingaround20,000people.TheCascadiaRisingdrillgivesarearesidentsandemergencyrespondersachancetopracticewhattodoincaseofa9.0-magnitudeearthquakeandtsunamialongoneofthenation'sdangerous-andunderestimated-faults.TheCascadiaEarthquakeZoneisbigenoughtocompetewithSanAndreas(it'sbeencalledthemostdangerousfaultinAmerica),butit'smuchlesserknownthanitsCaliforniacousin.Nearly700mileslong,theearthquakezoneislocatedbytheNorthAmericanPlateoffthecoastofPacificBritishColumbia,Washington,OregonandNorthernCalifornia.Cascadiaiswhat'sknownasa"megathrust"fault.Megathrustsarecreatedinearthquakezones-landplateboundarieswheretwoplatesconverge.Intheareaswhereoneplateisbeneathanother,stressbuildsupovertime.Duringamegathrustevent,allofthatstressreleasesandsomeoftheworld'smostpowerfulearthquakesoccur.Rememberthe9.1earthquakeandtsunamiintheIndianOceanoffSumatrain2004?ItwascausedbyamegathrusteventastheIndiaplatemovedbeneaththeBurmamicro-plate.ThelasttimeamajorearthquakeoccurredalongtheCascadiafaultwasin1700,soofficialsworrythatanothereventcouldoccuranytime.Topreventthateventfrombecomingacatastrophe,firstresponderswilljoinmembersofthepublicinrehearsalsthatinvol