安徽省白泽湖中学2023学年高三第二次调研英语试卷（含解析）

2023学年高考英语模拟测试卷注意事项:1．答题前，考生先将自己的姓名、准考证号码填写清楚，将条形码准确粘贴在条形码区域内。2．答题时请按要求用笔。3．请按照题号顺序在答题卡各题目的答题区域内作答，超出答题区域书写的答案无效；在草稿纸、试卷上答题无效。4．作图可先使用铅笔画出，确定后必须用黑色字迹的签字笔描黑。5．保持卡面清洁，不要折暴、不要弄破、弄皱，不准使用涂改液、修正带、刮纸刀。第一部分（共20小题，每小题1.5分，满分30分）1．Infact，mostofuswouldtheconsequencesofstupiddecisionstakenbyothers.A．handle B．solve C．follow D．suffer2．Everyonehadaforminhishand,butnooneknewwhichoffice____．A．tosenditto B．tosentit C．tobesentto D．tohaveitsent3．Hehadagreatdearietohaveahomeofhisown,______hehadalwayslivedwithhisgrandmother.A．or B．and C．so D．for4．—Penny’sbabydaughternarrowlyescapeddrinkingthefurniturepolishonthecoffeetable.—Luckilyforher.She________sickorevendied.A．couldhavegot B．shouldhavegotC．musthavegot D．willhavegot5．Thereasonwhyheadaptedtothenewsituationsquicklyisthathehada________attitude.A．changeableB．stableC．movableD．flexible6．Don’trefertothedictionaryeverytimeyoucomeacrossanewwordassometimesitsmeaningmaybe_______clearlyinagivencontext.A．pickedout B．ruledout C．broughtout D．takenout7．—I’mtiredout.Ican’trunanyfurther,Tom.—________!Mike.I’msureyoucandoit.A．Comeon B．NohurryC．Noproblem D．Welldone8．8studentsand2teachersatSantaFeHighSchoolbya17-year-studentarmedwithashotgunandapistol.Thisisoneofthemanygun-relatedtragediesthathavehappenedinthelast2years.A．killedB．werekilledC．havekilledD．havebeenkilled9．Noonebelieveshisreasonsforbeinglatethathewascaughtinatrafficjam,_______madehimembarrassed.A．it B．which C．that D．why10．—Idroppedbyat6:00pmyesterdaybutfailedtoseeyouatyourhouse.—I________inagymatthattime.A．wasexercisingB．amexercisingC．haveexercisedD．hadexercised11．——Congratulationsonyourpromotion.Gooutfordinner,OK?——Good!__________,justyouandme.A．FollowmeB．MytreatC．MypleasureD．Allowme12．Whatmattersinlifeisworkinghard________hardlyworking.A．aswellas B．lessthanC．ratherthan D．otherthan13．Fredlet________thathewaspreparedtoleavecompanywhenthenewmanagertookoffice.A．secretB．slipC．promiseD．standard14．BythetimehearrivedinBeijing,we_______therefortwodays.A．willhavestayed B．stay C．havebeenstaying D．hadstayed15．Onlyaftertalkingtotwostudentsthathavingstrongmotivationisoneofthebiggestfactorsinreachinggoals.A．Ididdiscover B．didIdiscoverC．Idiscovered D．discovered16．Smelltheflowersbeforeyougotosleep,andyoumayjust________sweetdreams.A．keepupwith B．putupwith C．endupwith D．catchupwith17．---Haveyouheardthattheyareworkingaroundtheclocktocompetefortheprize?---Don’tworry.Wearereadytothechallenge.A．buildup B．takeupC．stickto D．leadto18．—Look!Maryiscrazilylookingforsomethingagain!—_____,shecan’tfindherkeys.A．Typically B．Occasionally C．Accordingly D．Particularly19．Computerscandonothing．Butonce______whattodo,theyshowextraordinarypowertodoagreatdeal．A．toprogram B．beingprogrammedC．programmed D．havingprogrammed20．Teachingasacareeristomanypeopleowingtothelongholidays.A．popular B．familiarC．attractive D．fantastic第二部分阅读理解（满分40分）阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。21．（6分）“Howdoyouaccountforyourremarkableachievementsinlife?”QueenVictoriaoftheUKaskedHelenKeller.“Howdoyouexplainthefactthateventhoughyouwerebothblindanddeaf,youwereabletoachievesomuch?”Ms.Keller'sanswerisatribute（致敬）toherkindteacher.“IfithadnotbeenforAnneSullivan,thenameofHelenKellerwouldhaveremainedunknown.”AccordingtospeakerZigZiglar,AnnieSullivanwasnostrangertohardship.Shewasalmostsightlessherselfandwas,atonetime,diagnosedashopelessly“insane”byhercaregivers.Shewaslockedinthebasementofamentalinstitution.Occasionally,Anniewouldviolentlyattackanyonewhocamenear.Mostofthetimeshegenerallyignoredeveryoneinherpresence.Anelderlynursebelievedtherewashope,however,andshemadeitherworktoshowlovetothechild.EverydayshevisitedAnnie,andsheleftcookiesforherandspokewordsofloveandencouragement.ShebelievedAnniecouldrecover,ifonlyshewereshownlove.Eventually,doctorsnoticedthechangeinthegirl.Wheretheyoncewitnessedangerandhate,theynawnotedagentlenessandlove.Theymovedherupstairswhereshecontinuedtoimprove.Thenthedayfinallycamewhenthisseemingly“hopeless”childwasreleased.AnneSullivangrewintoayoungwomanwithadesiretohelpothersasshe,herself,washelpedbythekindnurse.ItwasshewhosawthegreatpotentialinHelenKeller.Shelovedher,disciplined（约束）her,playedwithher,pushedherandworkedwithheruntiltheflickeringcandlethatwasherlifebecameabeacon（灯塔）oflighttotheworld.AnneSullivanworkedwondersinHelen'slife;butinwasalovingnursewhofirstbelievedinLittleAnnieandlovinglytransformedanuncommunicativechildintoakindteacher.“IfithadnotbeenforAnneSullivan,thenameofHelenKellerwouldhaveremainedunknown.”Butifithadnotbeenforakindanddedicatednurse,thenameofAnneSullivanwouldhaveremainedunknown.1、Whatdoestheunderlinedpart“accountfor”probablymean?A．showB．proveC．explainD．present.2、WhatdoweknowfromtheThirdparagraph?A．Sullivanhadverynormalbehavior.B．Sullivanwasignoredbyeveryone.C．Sullivanwaskeptawayfromherparents.D．Sullivanwasbelievedlohaveamentalproblem.3、Whatwouldbethebesttitleforthenext?A．ThePowerofLoveB．MakingaDifferenceC．AGoodTeacherD．RemarkableAchievements22．（8分）BusToursinWashingtonDCTheBlossomsTourInWashingtonDCDuration:3hours$56.22BESTWAYtoExperiencetheCherryBlossoms!EachyearfrommidMarchtomidApril,seethebeautifulCherryBlossomsinWashingtonDCandgetgreatphotosbecauseyou’llbeledtoallthebestspotsbythebestguides.TheannualspringbloominDCisamagicaltimeandthistourpromisestoprovidetheverybesttouropportunityforyou!TheLightsNightTourinWashingtonDCDuration:3hours$56.33Highest-ratedNightTourinDC!TheONLYDCNightTourwheretheTourGuidesHOPOFFwithyouateachstopandtellyouabouteachmonumentandattracton.HOPaboardtheTheLightsNightTour!ThebesttimetotakeatourofWashingtonDCisatnight.TheBestMinibusTourinWashingtonDCDuration:3hours$46.22SeeallthekeyatractionsDChastoofferina3-hourformat.Youwilllearnallaboutthehistoryandtrivia(琐事)thatsurroundsWashingtonandvisitthemajormonumentsandattractionsDChastooffer.PleaseNote:Ratesforthistourvarybydayoftheweek.Whenyouchooseyourspecificdateontheavailabilitycalendar,theratesforthatdatewillbedisplayed.BestMountVernon&ArlingtonCemeteryTourfromWashingtonDCDuration:6hours$71.26SeeArlingtonCemetery,OldTownAlexandriaandGeorgeWashington’sMountVernonEstateonthissmallgroupbustourfromWashingtonDC．YourtourguidewillaccompanyyouthroughMountVernon,tellingyouaboutalloftheatractionsthereandthehistoryofGeorgeWashington’shomeonthePotomacRiver.1、WhichdatesuitsTheBlossomsTourmost?A．July4. B．August15.C．March27. D．October1.2、WhatisspecialaboutTheBestMinibusTour?A．Itspriceisnotfixed. B．Thebesttimetotakeitisatnight.C．Thetourguideaccompaniesyou. D．Youcangetgreatphotosofcherry.3、WhichtourwouldofferyouachancetolearnaboutGeorgeWashington’shome?A．TheBlossomsTour. B．TheLightsNightTour.C．TbeBestMinibusTour. D．BestMountVermon&ArlingtonCemeteryTour.23．（8分）ItiswidelyknownthatanyEnglishconversationbeginswithTheWeather.SuchafixationwiththeweatherfindsexpressioninDr.Johnson’sfamouscommentthat“WhentwoEnglishmeet,theirfirsttalkisofweather.”ThoughJohnson’sobservationisasaccuratenowasitwasovertwohundredyearsago,mostcommentators(评论员)failtocomeupwithaconvincingexplanationforthisEnglishweather-speak.BillBryson,forexample,concludesthat,astheEnglishweatherisnotatallexciting,theobsessionwithitcanhardlybeunderstood.Hearguesthat”Toanoutsider,themoststrikingthingabouttheEnglishweatheristhatthereisnotverymuchofit.”Simply,thereasonisthattheunusualandunpredictableweatherisalmostunknownintheBritishIsles.JeremyPaxman,however,disagreeswithBryson,arguingthattheEnglishweatherisbynatureattractive.Brysoniswrong,hesays,“becausetheEnglishpreferencefortheweatherhasnothingtodowiththenaturalphenomena(现象).”Theinterestislessinthephenomenathemselves,butinuncertainty.”Accordingtohim,theweatherinEnglandisverychangeableanduncertainanditattractstheEnglishaswellastheoutsider.BrysonandPaxmanstandforcommonmisconceptionsabouttheweather-speakamongtheEnglish.Bothcommentators,somehow,aremissingthepoint.TheEnglishweatherconversationisnotreallyabouttheweatheratall.Englishweather-speakisasystemofsigns,whichisdevelopedtohelpthespeakersovercomethenaturalreserveandactuallytalktoeachother.Everyoneknowsconversationsstartingwithweather-speakarenotrequestsforweatherdata.Rather,theyareroutinegreetings,conversationstartersortheblank“fillers”,Inotherwords,Englishweather-speakisameansofsocialbonding.1、TheauthormentionsDr.Johnson’scommenttoshowthat________.A．mostcommentatorsagreewithDr.JohnsonB．Dr.JohnsonisfamousforhisweatherobservationC．thecommentwasaccuratetwohundredyearsagoD．Englishconversationsusuallystartwiththeweather2、Whatdoestheunderlinedword“obsession”mostprobablyreferto?A．Asocialtrend. B．Anemotionalstate.C．Ahistoricalconcept. D．Anunknownphenomenon.3、Accordingtothepassage,JeremyPaxmanbelievesthat________.A．BillBrysonhaslittleknowledgeoftheweatherB．thereisnothingspecialabouttheEnglishweatherC．theEnglishweatherattractspeopletotheBritishIslesD．Englishpeopletalkabouttheweatherforitsuncertainty4、Whatistheauthor’smainpurposeofwritingthepassage?A．ToexplainwhatEnglishweather-speakisabout.B．ToanalyzemisconceptionsabouttheEnglishweather.C．TofindfaultwithbothBillBrysonandJeremyPaxman.D．ToconvincepeoplethattheEnglishweatherischangeable.24．（8分）Itseemsthatelectronicdevicesjustkeepgettingsmaller.ScientistsintheUnitedStateshaveannouncedthecreationofthefirsttransistorwithonlytwodimensions（二维）.Atransistorisasmallelectronicdevicethattransfersorcarrieselectroniccurrent.Scientistshopethesenew2Dtransistorswillbeusedforbuildinghigh-resolution（高分辨率）displaysthatneedverylittleenergy.Twogroupsofscientistscreatedthese2Dtransistors.Theyreportthatthetransistorsareonlyafewatomsthick.Usuallytransistorsaremadewiththeelementsilicon（硅）.Computerprocessors,memorychips,TVscreensandotherelectronicdevicescontainbillionsofsilicon-basedtransistors.Buttheseverysmallelectricalpartshavecertainlimitations.DimitrisIoannouisanelectricalengineeringprofessoratGeorgeMasonUniversity.Hesaysthetraditionaltransistorhasbeenimprovedasmuchasitcanbe.Headdsthatresearchershavebeenlookingfornewmaterialswithspecialfeaturesandtheywanttransistorstobeseenthroughandsoft.“Ifthelayersareverythin,thetransistorcanbecomeflexible,soitdoesn'thavetoberigid（坚硬的）,likeitwouldbeinasiliconchip.Sopeoplecanthinkofapplicationslikewearableelectronics,televisionscreensandotherthings,”saidIoannou.Thesenewtransistorscanalsocarryhighercurrent.Theyalsocanmovethecurrentmuchfasterthantraditionaltransistors.Thisisimportantforhigh-definitionscreens.DimitrisIoannousaysthescientificsuccesscouldproveveryusefulinthefuture."Now,howgoodandhowusefulitwillbe,it'sstillinthestageofresearch,butitcertainlyisanadvance,"saidIoannou.1、WhichofthefollowingstatementsaboutthenewlycreatedtransistorisTRUE?A．Theyareexpectedtobeusedinhigh-resolutiondisplays.B．Thetransistorsaremadewiththeelementsilicon.C．Theyarerigid,justliketraditionaltransistors.D．Theyhavealreadybeenputintoactualuse.2、WhatdoestheunderlinedsentenceinParagraph5mean?A．Thetraditionaltransistorshavebeenchangedintotwo-dimensionalones.B．Manyofthetraditionaltransistorshavebeenimprovedovertheyears.C．Thetraditionaltransistorhasbeendevelopedtoitsfullest.D．Thetraditionaltransistorhasbeendevelopedquitewell.3、WhatisDimitrisIoannou'sattitudetowardsthecreationofthenewtransistors?A．Negative.B．Neutral.C．Indifferent.D．Positive.25．（10分）Bendablewingscoveredwithoverlapping(重叠部分)pieceslookinglikefishscalescouldbeusedtobuildmorecontrollable,fuel­efficientaircraft,anewstudyfinds.Nowadays,conventionalaircrafttypicallyrelyonailerons(副翼)tohelpcontrolthewaytheplanestilt(倾斜)astheyfly.However,whentheWrightbrothersflewthefirstairplane,Flyer1,overacenturyago,theyusednoaileronsbutwiresthatpulledandstretchedthewood­and­canvaswings,tocontroltheplane.“Scientistshavelongsoughttodevelopaircraftthatcanchangetheirwingsduringflight,justasbirdscan.However,mostpreviousattemptshavefailedbecausetheyreliedonheavymechanicalcontrolstructureswithinthewings.Thesestructureswerealsocomplexandunreliable，”saidNeilGershenfeld,aphysicistanddirectoroftheCentreforBitsandAtomsatMIT.Thenewwingconsistsofasystemoftiny,strongandlightweightmodules(组件).Theshapeofthewingcanbechangeduniformlyalongitslengthusingtwosmallmotors,whichapplyatwistingpressuretoeachwingtip.Thesewingsarecoveredin“skins”ofoverlappingstripsofflexiblemateriallikefishscales.Thesestripsmoveacrosseachotherasthewingschangethemselves,providingasmoothoutersurface,theresearchersexplained.Windtunneltestsofthesewingsshowedthattheyatleastmatchedtheaerodynamic(气动)propertiesofconventionalwings,ataboutone­tenththeweight.“Initialtestsusingremotelypilotedaircraftmadewiththesewingshaveshowngreatpromise，”saidBenjaminJenett,agraduatestudentattheCentreforBitsandAtomsatMIT.Thenewmodularstructuresthescientistsdevelopedcouldbemanufacturedquicklyinmassquantitiesandtheninstalledbyteamsofsmallrobots.Thesemodularstructuresalsocanbedisassembledmoreeasily,makingrepairssimpler.“Still,thefirstaircraftbuiltusingthisstrategywillnotbeapassengerjet，”Gershenfeldsaid.“Instead,thetechnologywilllikelyfirstbetestedonunmannedaircrafts,leadingtoaircraftsflyingforalongtime,tohelpdeliverInternetaccessormedicinetoremotevillages.”1、WhyistheWrightbrothers'airplanementionedinthetext?A．Toshowthehistoryofaircrafts.B．Toshowthedevelopmentofwings.C．Toshowtheneedtoimproveplanes.D．Toshowthestructureofconventionalplanes.2、Whatmakesplanesflylikebirdswhentheytilt?A．Theirailerons.B．Wiresandpulleys.C．Changeablewings.D．Mechanicalcontrolstructures.3、WhatisParagraph4mainlyabout?A．Theshapeofthenewwings.B．Thepurposeoftheoverlappingstrips.C．Theworkingprincipleofthenewwings.D．Theresultofwind­tunneltestsofthesewings.4、Whatdoestheunderlinedword“disassemble”meaninParagraph6?A．Replace.B．Analyze.C．Putaway.D．Takeapart.第三部分语言知识运用（共两节）第一节（每小题1.5分，满分30分）阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项．26．（30分）Thedayforthegreatballooncompetitionfinallyarrived.Everyinsectinthegardenhadbeen1hard,andnowtheywerepreparingtobegintheirroutines.Theballooncompetitionswerealwayssomethingreallyspecial.Eachtime,theflyinginsectswerefavourite2towin,becausetheycouldseizetheballoonstringsandflyoffinalldirections,creatingallsortsof3intheair.4,onthisoccasionthereweresomeratherunusualinsectstakingpart:agroupofants.Ofcourse,5expectedthattheycoulddoanythingspecial.Theyweresolightthatnoanthadever6totakepart,butitwasquiteimpressivetoseealltheantsall7organizedandprepared.Sothecompetitionbegan,andthe8insectstooktheirturns,performingbeautifulmovementswiththeballoons.Asalwaysthebutterflieslefteveryone9withtheirtwistandturns,andtheirwonderfulcolours.Whenitwastimefortheantstoperform,itseemedlikethecompetitionhadalreadybeendecided.Forthe10timeinlivingmemory,theantssharedjustoneballoonbetweenthem,andonebyonetheyclimbeduptheballoonstring,11athinblackthreadofants.Whenallthestringwascovered,thelastantclimbed12histeammatestoreachtheballoon.13hegotthere,heclimbedontothetopoftheballoon.Thisstrange14attractedeveryone'scuriosity,andtheywerejustabouttowitnessthemostimportant15:theantopenedhisjawsaswideashecould...andthenhemadeaviolentmovementattheballoonwithallhisstrength!Theresultwaspowerful!Theballoonbeganblowingoutitsair,flying16about,hereandthere,doingathousandturnsandspins,whiletheantsmadeallkindsofbeautifulshapesoutofthestring.Ofcourse,thatacrobatic(杂技般的)flight17withquiteahardlanding,butitdidn't18Thecreativityandteamworkoftheantperformancewasso19thatthecrowddidn'tevenhavetovotefortheretobeawinner.Fromthenon,inthatgarden,everyoneunderstoodhowmuchcouldbeachievedbyworking20Intheyearstocome,theballooncompetitionswerefullofdisplayscarriedoutbyteams,andtheyputonsomewonderfulroutines;somethingthoseindividualinsectscouldneverhaveachievedontheirown.1、A．fighting B．training C．functioning D．living2、A．speakers B．organizers C．candidates D．producers3、A．patterns B．numbers C．drawings D．sounds4、A．Besides B．Thus C．Instead D．However5、A．anybody B．somebody C．everybody D．nobody6、A．bothered B．hesitated C．refused D．promised7、A．quickly B．terribly C．perfectly D．strangely8、A．special B．different C．familiar D．similar9、A．amazed B．disappointed C．bored D．blessed10、A．first B．second C．last D．next11、A．cutting B．forming C．using D．passing12、A．with B．over C．around D．through13、A．Once B．If C．Though D．Until14、A．idea B．attitude C．behavior D．experience15、A．effect B．case C．condition D．moment16、A．weakly B．madly C．peacefully D．carefully17、A．ended B．started C．continued D．broke18、A．help B．work C．matter D．tell19、A．necessary B．impressive C．natural D．important20、A．alone B．behind C．out D．together第二节（每小题1.5分，满分15分）阅读下面材料，在空白处填入1个适当的单词或括号内单词的正确形式。27．（15分）TravellingaroundtheSydneydistrictisawonderfulexperience.Thesightseeingoptionsare1．(end),butmosttravelersbeginontheharborattheSydneyOperaHouse.Knownasoneofthewondersoftheworld,itis2．photographer’sdream.Thereisahuge3．(choose)ofaccommodationsavailableinthecityanditssurroundingarea.DarlingHarborisfamousforitsrestaurantsandfour-starhotels.UnderthefamousSydneyHarborBridgeistheRocksshoppingdistrict,which4．(call)“theheavenofshoppers”.Youcanspendatleastahalfday5．(wander)throughthealleysandsidestreetstotake6．everythingtheshopsoffer.Ontheothersideofharbor7．(lie)anothermust-visitspot,theTarongeParkZoo.Withanexcitingcollectionofnativeanimals,includinglionsandgiraffes,8．israretofindazoowithaviewofDarlingHarborandthecityskyline.TheRoyalBotanicGardeniswithinwalkingdistanceoftheOperaHouse,andisanabsolutelyperfectplaceforapicniclunch.Afterlunch,takeawalktoSydneyTower,9．youcanget360-degree10．(forget)viewsofthecity.第四部分写作（共两节）第一节短文改错（满分10分）28．（10分）假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。删除：把多余的词用斜线（\）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。注意：1.每处错误及其修改均仅限一词；2.只允许修改10处，多者（从第11处起）不计分。Asmymotherandfatherwerealwaysbusyworking,soIwasoftenathomebymyself.IfeltboringallthetimeandIfeltsorryformyself.Oneday,inmywayhomefromschool,Isawapersonlivinginthepark.Hewaswearingdirtybutworn-outclothes.Hegavemeabigsmilewhenhesawme.Helookedifhewasthehappiestmanintheworld.Lookedathim,IrealizedhowluckilyIreallywas.IhaveenoughfoodtoeatandenoughclothestowearandIhadhard-workingparentswhoreallycaredabouthim.IrealizedwhatgratefulIwastomyparentsforallthatIhad.第二节书面表达（满分25分）29．（25分）书面表达假设你校英语社团举办以“节约能源，从我做起”为主题的征文活动。根据下面所给的要点提示，写一篇英语短文。要点提示：1.节约水电等；2.主动向周围人宣传节约能源的思想。注意：1.词数100左右。开头已为你写好，不计入词数；2.内容可适当发挥，注意行文连贯。Thesedayswastingthingshasbecomeacommonphenomenonaroundus._____________________________________________________________________________________________________________________________________________________________

2023学年模拟测试卷参考答案（含详细解析）第一部分（共20小题，每小题1.5分，满分30分）1、D2、A3、D4、A5、D6、C7、A8、B9、B10、A11、B12、C13、B14、D15、B16、C17、B18、A19、C20、C第二部分阅读理解（满分40分）阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。21、1、C2、D3、A22、1、C2、A3、D23、1、D2、B3、D4、A24、1、A2、C3、D25、BusyhealthcareprovidersinneedofBasicLifeSupportCPR(心肺复苏术)classescannowregistertotakethemonSaturdaymorningsthroughCPRCertificationHouston.AmericanHeartAssociationCertifiedBLSCPRforHealthcareProvidersclassesareavailableonSaturdaymorningsatCPRCertificationHouston,1121DelanoSt,Houston,Texas,77003.Bookinginformationcanbeobtainedbycalling(281)377­8918.Theseclassesoffermoreconveniencetonurses,emergencymedicaltechnicians,teachersandothersinneedofAHABLSCPR/AEDcertificationwhostruggletofittheclassintotheirbusyschedules.CPRCertificationHoustonisrecognizedbytheAmericanHeartAssociation.CPRCertificationHouston'sBasicLifeSupportCPRandAEDforadults,childrenandinfantsclassesaretheexactC