2025届山东济宁市兖州区高三第五次模拟考试英语试卷含答案

2025届山东济宁市兖州区高三第五次模拟考试英语试卷含答案注意事项: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．—youplaythepianoatthistimeoftheday?Ineedagoodrestfortomorrow’stest.—Sorry.A．Must B．Shall C．Can D．May2．—Whatdoyouwanttodonext?Wehavehalfanhouruntilthebasketballgame.—_____.Whateveryouwanttodoisfinewithme.A.It’suptoyou B．GladtohearthatC．Youcan’tmissit D．Itjustdepends3．Mymotheropenedthedrawerto______theknivesandspoons.A．putaway B．putup C．puton D．puttogether4．Thewarmthof____coatwillmostlybedeterminedby____softofclothused.A．the;a B．a;the C．/;the D．a;a5．Thisbookissaidtobethespecialone,which________manyeventsthatcannotbefoundinotherhistorybooks.A．covers B．writesC．prints D．reads6．Studentsarealwaysinterestedinfindingout_______theycangowithanewteacher.A．howfar B．howsoon C．howoften D．howlong7．Theguidanceteacherwastheiradviser,offeringthemsuggestionsandsolutionswhenthey______difficulties.A．aroseB．encounteredC．emergedD．evaluated8．Theboss_________theemployeesariseinsalaryforages,butnothinghasoccurredyet.A．promisedB．hadpromisedC．wouldpromiseD．promises9．It's________mewhyAlicegaveupherjobandgotmarried.A．under B．above C．over D．beyond10．Ourbedroomsareallonthesixthfloor,withitsownbathroom.A．all B．every C．either D．each11．Mr.White,who________inShanghaiforsevenyears,isamanagerofacompanyinBeijing.A．wasworking B．workedC．hadworked D．hasworked12．________theopportunitytospeakatthegraduationceremonymademeoverjoyed.A．Offering B．OfferedC．Tooffer D．Beingoffered13．—Mum,IbrokeDad’ssunglassesthismorning.—Youneedtomakeanapologyforyourfault,________youwillregret.A．andB．orC．butD．for14．Timeisaprecious________thatisoftentakenforgrantedamongtheyoungpeople.A．commodity B．commission C．component D．constitution15．—ThankyouverymuchforgivingmeahandwhenIwasintrouble.—Don’tmentionit.Ionlydidwhatanyoneelse_______inmyplace.A．mustdo B．couldhavedoneC．woulddo D．canhavedone16．WhenThanksgivingDayisthecorner,storesandsupermarketsarebusywithpeople.A．around B．on C．with D．at17．Tomakeextra-classeducationrunontherighttrack,Chinaistightening_____ofafter-schooltraininginstitutions.A．applicationB．regulationC．adaptationD．cooperation18．________yourecognizeanidiomwhenitisbeingused,itiseasytomisunderstandwhatyoureadorhear.A．Unless B．AfterC．Once D．Since19．WhenPaul________forthefinalgameofthebasketballseason,hisfansletoutshoutsofcry.A．madeupB．showedupC．caughtupD．heldup20．Shesatonthetopofthestairs_____herheadonhercrossedarmsandcried.A．for B．when C．with D．while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）阅读理解Onthefirstdayofschoolourprofessorintroducedhimselfandchallengedustogettoknowsomeonewedidn'tknow.Ilookedroundwhenagentlehandtouchedmyshoulder.Iturnedaroundtofindawrinkled,littleoldladywithasmile.Shesaid,“Hi,handsome.MynameisRose.I'meighty­sevenyearsold.CanIgiveyouahug？”Ilaughedandenthusiasticallyresponded,“Ofcourseyoumay！”Shegavemeagiantsqueeze.“Whyareyouincollegeatsuchayoung，innocentage？”Iasked.“IalwaysdreamedofhavingacollegeeducationandnowI'mgettingone！”shetoldme.AfterclasswewalkedtotheStudentUnionbuildingandsharedachocolatemilkshake.Webecameinstantfriends.Everydayofthenextthreemonthswewouldleaveclasstogetherandtalknon­stop.Iwasalwayslisteningtothis“timemachine”asshesharedherwisdomandexperiencewithme.Overthecourseoftheyear,Rosebecameacampusicon(偶像)andsheeasilymadefriendswherevershewent.AttheendofthesemesterweinvitedRosetospeakatourfootballdinner.I'llneverforgetwhatshetaughtus.“Wedonotstopplayingbecauseweareold;wegrowoldbecausewestopplaying.Thereisahugedifferencebetweengrowingolderandgrowingup.Anybodycangrowolder.Thatdoesn'ttakeanytalentorability.Theideaistogrowupbyalwaysfindingopportunitiesinchange.Havenoregrets.Theelderlyusuallydon'thaveregretsforwhatwedid,butratherforthingswedidnotdo.Theonlypeoplewhofeardeatharethosewithregrets.”Sheconcludedherspeechbycourageouslysinging“TheRose”．Shechallengedeachofustostudythelyrics(歌词)andlivethemoutinourdailylife.Attheyear'sendshefinishedthecollegedegreeshehadbegunallthoseyears.OneweekaftergraduationRosediedpeacefullyinhersleep.1、Whathappenedtotheauthoronthefirstdayofschool?A．Hegottoknowanoldprofessor.B．Hemadetheacquaintanceofanoldlady.C．HejoinedtheStudentUnion.D．Hehadtoshareamilkshakewithothers.2、FromtheunderlinedsentenceinParagraph1,wecanfindouttheauthor's________.A．concernaboutageB．respectfortheoldC．curiosityabouttheladyD．complaintabouteducation3、Intheauthor'seyes，________.A．RosewasinnocentandgenerousB．RosewaswiseandskilledC．Rosewastalentedandhard­workingD．Rosewascourageousandherwordswereinspiring4、WhichsayingmightRosepossiblysupport________.A．Oneisnevertoooldtolearn.B．Afriendinneedisafriendindeed.C．Romewasn'tbuiltinaday.D．Itisnousecryingoverspiltmilk.22．（8分）OneofIndia’stopengineeringschoolshasrestrictedInternetaccessinitsboardinghouses,sayingaddictiontosurfing,gamingandbloggingwasaffectingstudents’performance,makingthemlonelyandevensuicidal.AuthoritiesatthebestIndianInstituteofTechnology(IIT)inMumbaisaidstudentshadstoppedsocializingandmanywerelateformorningclassesorsleptthroughthem.“Now,astudentdoesn’tevenknowwholivestwodoorsawayfromhimbecauseheissobusyontheInternet,”saidPrakashGopalan,deanofStudentAffairs.“Theolddormitorycultureofcompanionshipandsocializingamongstudentsisgone.Thisisnothealthyinouropinion.”IIT-Mumbai,withabout5,000students,isoneofthesevenIITsacrossIndiawhichareconsideredtobeamongthefinestengineeringschoolsintheworld.Theyarealsoatalentpoolforglobaltechnologygiants.Buttheirhardcourses,toughcompetitionandlonelycampuslifestylehavetakenaneffectonstudents.DepressiveanddysfunctionallifestylesareknowntobecommonamongIITstudents,andatleastninehavecommittedsuicideinthepastfiveyears.StudentshaveunlimitedfreeInternetaccessintheirboardinghousestohelpthemintheirstudies,butmanyalsouseittosurf,chat,downloadmoviesandmusic,blogandforgaming.“StartingMonday,Internetaccesswillbebannedbetween11p.m.and12:30p.m.atIIT-Mumbai’s13boardingbuildingstoencouragestudentstosleepearlyandtotryandforcethemoutoftheirshells.”Gopalansaid.Butthemovehasnotgonedownwellwithstudentswhosaytheyhatetheirlivesbeingregulated.“Nowtheywillsayweneedtolistentoalullaby(摇篮曲)togotosleep.”saidRajiv,anelectronicsstudent.1、WhatmayhappentothestudentsaddictedtotheInternetinIIT-Mumbai?A．Feellonelyandevensuicidal.B．Performwellinstudies.C．Knowtheirclassmatesbetter.D．Participateinsocialactivities.2、Whatdoestheunderlinedword“dysfunctional”inParagraph3mostprobablymean?A．unpopularB．meaningfulC．abnormalD．exciting3、WhatmeasureshavebeentakeninIIT-Mumbai?A．Studentsmustgotobedbefore11p.m.B．StudentsareforbiddentosurftheInternetoncampus.C．StudentshaveunlimitedfreeInternetaccessintheirdormitories.D．Internetaccessisunavailableindeepnightinboardingbuildings.4、Whatcanweinferfromthelastparagraph?A．Allelectronicsstudentshatethebanningorder.B．Somestudentscomplainaboutthebanningorder.C．ThereisnoInternetaccessontheIITcampuseversince.D．MorestudentspreferlisteningtomusictosurfingtheInternet.23．（8分）Ifyouwanttobeproductive，youmustcompletework．Almosteverythingwedohasmanystagestocompletionandinmanysituations，youdon'tactuallycreatevalueuntilyoufinishthelaststage．Farmerscan'tselltheirgrainuntilitisharvested．Automakerscan'tsellcarsthathavemadeit90%ofthewaythroughtheassemblyline（生产线）．Mostemployersaren'tgoingtopayyouforhavingadegreeunlessyoufinishedthelastclassandgraduated．Nowallthosethingsrequirestarting，butifyouhaveworkinprogress，themostvaluablethingyoucandoistopicksomethingandfinishit．Finishingiswhereyoustartbenefitingfromthevalueyou'vecreated．I'venoticedthatmanysuccessfulpeoplearen'ttheoneswhoarethesmartestorhavethebestideas．Theyareoftentheoneswhodothebestjoboftakinganideaandcompletingit．Agoodideafullycarriedoutisbetterthanagreatideathatnevergetscompleted．Doesthismeanyouneedtofinisheverythingyoustart？Notnecessarily，butifyoudon'tthinksomethingisworthfinishing，behonestwithyourselfandterminatetheproject．Don'tleavehundredsofhalffinishedeffortslyingaroundphysicallyormentallyactinglikeyouaregoingtocomebackandpickthemup．Ifyouneedtodropsomething，dosostrategicallyandintentionally．Ifyou'veputsignificanteffortintoaproject，youmaystillbenefitfromfinishingitevenifyouwouldn'tstartitagainbasedonchangedcircumstances．Forexample，ifyouareinyourlastfewmonthsbeforegraduatingfromcollegeandrealizeyoudon'twanttocareerinwhatyouaremajoringin，youprobablyshouldgoaheadandgraduatebecausethereissignificantvalueinhavingthedegree---evenifyoudon'tintendtoactuallyworkinthatfield．Whatprojectsdoyouhavethatarecurrentlyinprogress？Canyoufindsomethingandfinishit？1、Whydomanypeoplebecomesuccessfulaccordingtotheauthor？______A．Theyarethesmartest B．TheyhavethebestideasC．Theystartthingssmoothly D．Theymakeideasfullycompleted2、Whatdoestheunderlinedword"terminate"inparagraph3mean？______A．Develop B．EndC．Plan D．Support3、Accordingtotheauthor，whichofthefollowingisthecorrectwayofcreatingvalue？______A．AmandecidestofinishallhestartstodoB．FarmershurrytoselltheircropsbeforetheyareripeC．AcollegestudentchoosestostudyuntilhegetshisdegreeD．Astudentkeepsahalf-filledstampalbumaroundforfutureuse4、Whatisthebesttitleforthetext？______A．Finishingvs．Starting B．WellBegunisHalfDoneC．Planningvs．Performing D．ItisEasierSaidthanDone24．（8分）DundonaldCareClubhasajam-packed,excitingandfun-filledprogramofactivitiesandoutingsforyourchildtoparticipatein.InformationOpen:MondaytoFriday8:00am－6:00pm,fromMonday14toMonday21October(inclusive)Costs:£18perday(8:00am―6:00pm)£10perhalfday(8:00am—1:00pmor1:00pm~~6:00pm)£80fulllweekPleasenotethatbookingsMUSTbemade2weeksinadvanceandpaidinFULL.DundonaldCareClub(availableatDundonaldonly)DateTypeofbookingActivityamActivitypmMonday14OctoberFulldayEglingtonPark,IrvineTuesday15OctoberFulldayWestFMStudioTourWednesday16OctoberHalfdayorFulldayAthleticsandBadmintonDundonaldCastleThursday17OctoberFulldayRoukenGlenCountryParkFriday18OctoberHalfdayorFulldayHalloweenCraftsColdbaking—somesweettreatsMonday21OctoberFulldaySpookystorytelling,HalloweendecorationsthenHalloweenpartyincludingcookingforapplesPleasechecktheprogramonwhetherafullorhalfdaybookingisavailable.Weathernotpermitting,asuitablealternativeactivitymaybeprovided.1、IfyougototheDundonaldCareClubonMondayandFriday,youatleastpay________.A．£36 B．£28 C．£98 D．£902、Whatwillvisitorsdoat8:00am—1:00pm,16October?A．MakeHalloweencrafts. B．Dosomesportsactivities.C．Preparesomesweettreats. D．HaveaWestFMStudioTour.3、Whatinformationcanwelearnfromthepassage?A．Therearenoactivitiesatweekends.B．Outingsarethecenteroftheprogram.C．Theactivitywillbecancelledinbadweather.D．Thebookingisavailablefrom14to21October.25．（10分）Itcouldhavebeenanyofus,butithappenedtobeme.Ireceivedabrief18-monthsofundividedattentionandloveastheonlychild,beforethreemoreappeared.Thesecondwasasevereblow.Nodoubt,learningtheneedtosharewasimportant,butIhadtastedthelifeofanonlychild.Thencameyearsofrequeststolookafterthesiblings(兄弟姐妹),beingurgedthat,youshouldbesettingabetterexample,“AgainandagaintheothersgotawaywithdoingwrongbutIdidn’t.Weeachplayedourroles;thesecondonewholaterskippedschooltomeetboys;theeversoattractivethird,theboywhocoulddonowrong;andfinallythesurpriseappearanceofthefourth,seemedcertaintobespoiledevennow.Sothatleftme:thereasonable,quietonewhogotthegrades,didthehouseworkandbecameachameleon(变色龙)—skilledatreadingasituationandbeingwhatwasneeded.Theneventuallycamethechancetobethefirsttoleaveandexperiencelifeontheoutside,notdefined(定义)astheeldest.ThemomentIhadwaitedfor.Butnow,manyyearslater,beingtheeldestmattersagain.It’sdowntome;itseems,totaketheleadincaringforourparents.AllthetimeIwasmadetolearnaboutsharing;however,whenitcomestoresponsibility,itnolongerseemstoapply.Theothersaretoobusy,toofaraway,ortoounconcerned.SodutifullyItravelmanytimesacrossthecountryforhourstoprovidecareandsupport.Requeststomysiblingstohelpoutmorefallondeafears.Tome,thedutifulfirstborn,itfeelsliketherightandonlythingtodo;tobethereforourparentsastheywereforus.Sadly,thatfeelingisn’tsharedbythesecond,thirdorfourth.1、Howdoestheauthorcommentonthefourchildreninthesecondparagraph?A．AngrilyandBitterly.B．Angrilyandproudly.C．Bitterlyandhumorously.D．Humorouslyandproudly.2、Howdidtheauthordevelophissocialskills?A．Throughhardwork.B．Withtheparents’help.C．Attheparents’request.D．Inpracticeforeffectiveness.3、Whatdoestheunderlinedword“it”inthelastparagraphrefersto?A．Tocarefortheold.B．Tohelptheyoung.C．Toliveoutsidealone.D．Totravelnationwide.4、Whatcanwelearnfromthetext?A．Thewriterhatestobetheeldest.B．Thewriterfeelsproudofhisrole.C．Thewriterissatisfiedwithhisattempt.D．Thewriterisregretfulaboutthesiblings.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）Anoldmanhadbeenworkingformanyyearsforatown.Hisjobwastoclearawaynaturalwastefromthepoolwaterinthehills,whichmadeupthelovelyriverflowingthroughthetownnearby.Quietlyand1,theoldmanguardedthehills,2theleavesandbranches,andcleanedupthedirtthatwouldhave3andpollutedthefreshflowofwater.Thetownsoonbecameapopularattractionfortourists.Elegantswans(天鹅)floatedalongtheclearriverandtheviewwassobeautiful4words.Yearspassed.Oneeveningthetown5met.Astheyreviewedthebudget,oneman’s6caughtsightofthesalary7beingpaidtotheseldomseenkeeperoftheriver.Heasked,“Whoistheoldman?Whydow8toemployhim?Nooneintownever9him.Forallweknow,thestrangekeeperofthehillsisn’tdoinghisjob.Hispositionisn’t10anylonger.”Thentheyvotedto11theman.Forseveralweeks,nothingchanged….Byearlyautumn,thetreesbeganto12theirleaves.Smallbranchesbrokeoffandfellintothepoolsofthehills,13theflowoftheshiningwater.Oneafternoon,someonenoticedaslightyellowish-brown14intheriver.Afewdayslater,thewaterwasmuch15Withinanotherweek,anoilysomethingcoveredsomesectionsofthewateralongthebanks,andaterrible16wassoonsensed.Swansleftandsodidthe17Theonlythingthatwasnowvisitingthevillagewasdiseaseandsickness.Quickly,the18towncommitteecalledaspecialmeeting.Realizingtheirhugeerrorin19,theyrehiredtheoldkeeperoftheriveragain,andwithinafewweeks,theriverbegantoclearup.SwansandtouristscamebackagainandnewlifereturnedtothesmalltownintheAlps.Neverignoretheseemingsmallnessofatask,joborlife.Theymayallmakea201、A．regularly B．suddenly C．naturally D．actually2、A．cut B．burned C．removed D．selected3、A．carried B．poured C．changed D．blocked4、A．beyond B．with C．in D．after5、A．office B．association C．department D．committee6、A．eye B．care C．hand D．mind7、A．list B．form C．figure D．account8、A．promise B．continue C．stop D．tend9、A．visits B．hires C．tells D．sees10、A．powerful B．important C．necessary D．suitable11、A．find B．fire C．support D．forgot12、A．lose B．miss C．fall D．grow13、A．pulling B．speeding C．slowing D．pushing14、A．fish B．color C．flower D．leaf15、A．deeper B．cooler C．warmer D．darker16、A．sound B．smell C．wave D．taste17、A．managers B．passengers C．villagers D．tourists18、A．embarrassed B．annoyed C．discouraged D．diappointed19、A．arrangement B．assignment C．judgement D．amusement20、A．suggestion B．difference C．progress D．decision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）Manypeopleareenjoyingtheadvantageofincreasedbrainfunctionsas1．resultofusingnootropics(健脑药).Nootropicsarealsocalledlimitlessdrugsbecauseit’ssaidwecan2．(free)addthemtoourdiets.Isthisreal?Neurotransmitters(神经介质)havethepowertonotonlyaffectourmood,energylevels,3．(concentrate),memory,andsleep,buttheyalsohavetheabilitytopositively4．negativelyaffectourhealth.5．(proper)balanceandlackinanyoftheseneurotransmitterscanleadtoserioushealthproblems.Tryingtochangeneurotransmitterpathwaysinyourbrain6．(achieve)aparticulareffectisnotadecisiontobetakenlightly.Youcancreateserioushealthproblemsforyourselfinthefuture7．changingthedelicateandcomplexbalanceofchemicalsinyourbrain,so8．isagoodideatotalktoyourdoctorabouttakinganynootropicdrugsbeforeexperimentingwiththemyourself.Rememberthatallpillshavetheirownsideeffects.Withsomanynootropicproductsavailable,eachof9．hasthepotentialtohelporharmyourhealth,yourdoctorcanhelpyoufigurewhichonemaybebestforyou.Theeffectsofnootropics10．(be)differentbecauseeveryoneisunique.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。每处错误仅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:在错的词下画一横线，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。DearMr、Brown，WehavelearnedthatyouweregoingbacktoAmericaforthesummervacation、Toexpressourthankforyourexcellentteachinginourschool，wehavedecidedhaveapartyforyou、Thepartywhichwillstartat6:30onFridayeveninginthelecturehall、Itwillpossiblelastanhour、Tostartwith，ourmonitorwillgiveaspeechonbehalfofawholeclass、ThenwewouldliketoinviteyoutojoinusandsingingsomeEnglishsongs、Intheendoftheparty，wewillpresentyouwithsomegiftsandcards，mostlymakingbyourselves、Ibelieveyouwillhaveagoodtimetogether、Lookingforwardtoyourcoming、Yourssincerely，Frank第二节书面表达（满分25分）29．（25分）假设你是李华，你的美国笔友Jane最近总是感觉很疲劳，因此写信向你咨询如何调整状态，保持健康。请你根据以下要点给她回信。1.饮食要健康；多吃水果、蔬菜，因为它们富含纤维素和维生素；少吃黄油、奶酪、咖啡和巧克力，因为它们含糖和脂肪太多，糖和脂肪使你迅速变胖。2.要有良好的生活习惯：一方面，定期锻炼；另一方面，充足的睡眠，不要过度劳累，不抽烟等等。要求：1.词数约100左右。2.可以适当增加细节，使短文连贯。3.信的开头及结尾已给出，不计入总次数。DearJane,I’msorrytohearthatyouarenotverywellthesedays.Inyourletteryouaskedmehowtoadjustyourself____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Bestwishes!Yours,LiHua

参考答案第一部分（共20小题，每小题1.5分，满分30分）1、A2、A3、A4、B5、A6、A7、B8、A9、D10、D11、B12、D13、B14、A15、B16、A17、B18、A19、B20、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、Everyday,peoplecomeintocontactwiththousandsofchemicals.Thesechemicalsaresaidtobeharmlesstohumanhealth.Infact，thechemicalsareconsideredsosafethatwewashwiththem.Weputthemonourbodiesandevenourfaces.Otherchemicalproductsareusedthroughoutourhomes.Bythetimeyouwalkoutofyourfrontdoor,youhavealreadybeenexposedtothousandsofchemicals.Onitsown,eachchemicalseemsharmless.Butincombinationwithotherchemicals,theymaybecomedeadly.Thatisthefindingofatwo-yearstudybyahigh-profiletaskforceofscientists.Thetaskforcewastoldtoinvestigatethecancer-causingpossibilityofchemicalmixtures.LindaGulliverwasoneof174scientistsonthetaskforce.Theirjobwastostudythecancer-causingpotentialof85chemicals.All85aresaidtobecommonintheenvironment.Ms.Gulliverexplainsthatchemicalshavethepotentialorytoformdangerousmixtures.Evensimplemineralscanbecomedangerouswhenmixedwithchemicalsfoundinplasticsorbeautyproducts.Workingingroups,thescientistsexploredhowdifferentchemicalmixturescouldleadtocancer.Ms.Gulliver’steamlookedattheabilityofdifferentcombinationstosupportthein-creaseofmalignant(恶性的)humancells.Shesaysthecurrentwaytoidentifywhetherchemicalscausecanceristotestthemoneatatime.Thismethodleads,sheadds,toalonglistofsupposedly“safe”chemicals.Sheandherteamsaythatapproachneedstochange.“Wedefinitelyneedcertainresearch…tofindoutwhatmixturesofchemicalswouldbemoreharmfulthanothers;whatg