2024屆廣西百色市西林民族高中高三第五次模擬考試英語試卷注意事項：1．答卷前，考生務必將自己的姓名、準考證號填寫在答題卡上。2．回答選擇題時，選出每小題答案后，用鉛筆把答題卡上對應題目的答案標號涂黑，如需改動，用橡皮擦干凈后，再選涂其它答案標號。回答非選擇題時，將答案寫在答題卡上，寫在本試卷上無效。3．考試結束后，將本試卷和答題卡一并交回。第一部分（共20小題，每小題1.5分，滿分30分）1．Don’tleavethewater______whileyoubrushyourteeth.A．racingB．rushingC．runningD．rolling2．Ourbossistoostrictwithus.Ican’t_____inwiththeworksituationhere.A．fit B．get C．make D．take3．Afterhewaspromotedtothepresentposition,heisnotsohardworkingashe______.A．wasusedto B．usedtobe C．wasusedtobeing D．usedto4．–Whichdriverwastoblame?--Why,______!Itwasthechild’sfault,clearandsimple.Hesuddenlycameoutbetweentwoparkedcars.A．both B．eachC．either D．neither5．Thebooksonthedesk,coversareshiny,areprizesforus.A．which B．what C．whose D．that6．Thoughourfootballboysarefacedwithfourgoalsbehind,theyarestillstrugglinghardinthefieldto______.A．facethemusic B．savefaceC．costtheirarmandleg D．landontheirfeet7．I'mcallingtoenquireabouttheposition__________inyesterday'sChinaDaily.A．advertised B．tobeadvertised C．advertising D．havingadvertised8．Withineventheweakestofhumanbodiesliesalifethatispreciousindeed---____needstoberespectedandhonored.A．somethingthat B．one C．onethat D．something9．Allthestudentsarerequiredtochecktheyhavemadesomespellingerrorsintheircompositions.A．whetherB．whatC．thatD．which10．Childrenarelikelyto________somebadhabitswhenplayingthepianoiftheydon’thaveproperlessons.A．keepup B．catchupC．pickup D．giveup11．—Sorry,sir.I______followyou.Wouldyoupleasespeakslower?—Ok.A．can’t B．mustn’t C．shouldn’t D．needn’t12．youcanlearntoappreciatethechallengesinlife,youwillfindinnerstrength.A．WhenB．WhileC．BeforeD．Unless13．________someleadersandscientistshavepraisedChina’sachievementinspacetechnology,othersregardChina’sprogressasathreat.A．Unless B．OnceC．Eventhough D．Nowthat14．—WhatdoesNicky’sjobinvolveasapublicrelationsdirector?—______quitealotoftimewithotherpeople.A．SpendingB．HavingspentC．TospendD．Tohavespent15．—Whynottalkwithyourparentsaboutyourwillingnesstoattend2017PekingUniversitySummerCamp?—Itried____togetthemtolistentome.A．intime B．invainC．inneed D．incase16．InmanyhomesintheUK,thefirstperson_______hastomaketeaforthefamily.A．wakingup B．towakeupC．wokeup D．wokenup17．—DidyoumeetMr.Smith?—Yes.WhenIarrived,he________forNewYorktoattendapressconference.A．wasjustleaving B．justleftC．justleaves D．hadjustleft18．—Thelectureabout3Dtechnologywasveryinteresting.—It’sapity.HowIwishI________timetoattendit.A．had B．have C．hadhad D．havehad19．Mollyfinallyagreed,_____reluctantly,togoandseeadoctor.A．afterwards B．almostC．otherwise D．somewhat20．—Tom,doyouenjoyyourpresentjob?—________.Ijustdoitforaliving.A．OfcourseB．NotreallyC．NotlikelyD．That’sallright第二部分閱讀理解（滿分40分）閱讀下列短文，從每題所給的A、B、C、D四個選項中，選出最佳選項。21．（6分）閱讀理解Onthefirstdayofschoolourprofessorintroducedhimselfandchallengedustogettoknowsomeonewedidn'tknow.Ilookedroundwhenagentlehandtouchedmyshoulder.Iturnedaroundtofindawrinkled,littleoldladywithasmile.Shesaid,“Hi,handsome.MynameisRose.I'meighty-sevenyearsold.CanIgiveyouahug？”Ilaughedandenthusiasticallyresponded,“Ofcourseyoumay！”Shegavemeagiantsqueeze.“Whyareyouincollegeatsuchayoung，innocentage？”Iasked.“IalwaysdreamedofhavingacollegeeducationandnowI'mgettingone！”shetoldme.AfterclasswewalkedtotheStudentUnionbuildingandsharedachocolatemilkshake.Webecameinstantfriends.Everydayofthenextthreemonthswewouldleaveclasstogetherandtalknon-stop.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(歌詞)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．Rosewastalentedandhard-workingD．Rosewascourageousandherwordswereinspiring4、WhichsayingmightRosepossiblysupport________.A．Oneisnevertoooldtolearn.B．Afriendinneedisafriendindeed.C．Romewasn'tbuiltinaday.D．Itisnousecryingoverspiltmilk.22．（8分）Inoureverydayliveswemeetsituationsinwhichwetakemanythingsforgranted（不去重視）.Weonlytreasurethingswhentheyaregone.Thisisasadtruthofhumannature.Oneday,Ifoundmyselfasawitnesstoasimilarsituation.Oneevening,Ileftworkandboardedthetrain.Afterentering,Inoticedsomethingunusual.Thecenterofthecarhadafewemptyseatswhilebothendswerecrowdedwithpeoplestanding.Ididn'tpaymuchattentionandsatdownononeoftheemptyseats.Isensedafunnysmell.Itwasn'tlongbeforeInoticedahomelesspersonsleepingonthreeseatsinfrontofme.Hewasbleedingfromhisnose.Whywasn'tanyonehelpinghim?Hisclothesweretornandhewasgivingoffastrangesmell.Alongwiththesmell,hiseyesweredull,wateryandred.Occasionallyhescratchedhimselfandpeoplelookedathimasifhehadcommittedacrime.Asthetrainstoppedatstationsandmorepeoplecameintheycoveredtheirnosesandfacedawayfromhim.Alltheseatsaroundhimwereempty.Suddenly,hebegantoswearatthepeoplearoundhim.Aplainclothespolicemanwholookedlikeaconstructionworkertookouthiscertificateandshowedittothehomelessman.Theofficer,notwantingtotouchthehomelessman,toldhimhisrightsanddirectedhimtoexitthetrain.Astheofficerwalkedthemanoutofthetrain,thehomelessmanturnedaroundandsaid"MYHOME!"andstartedcrying.Amandoesn'tvaluethingsuntiltheyaregone.Ifhedidn'thaveahome,atleasthehadfreedom.Nowhehasneither.Noonewantstohelpsomeonewhowon'thelphimself.1、Whenenteringthecar,howdidtheauthorfeelatfirst?A．Annoyed.B．Puzzled.C．Sad.D．Calm.2、Howdidpeoplereacttothehomelessman?A．Theycaughthimandcalledthepolice.B．Theycoveredhimwithcleanclothes.C．Theydislikedandavoidedhim.D．Theystaredathimcuriously.3、Itcanbelearnedthatthepoliceman.A．wasveryrudetothemanB．sentthemanbacktohishometownC．forcedthemantoleavethecityD．wentoffthetrainwiththeman4、Whatdoestheauthorthinkofthehomelessman?A．Heisaloseroflife.B．Heisworthourrespect.C．Heisveryfunny.D．Heisafearlessfighter.23．（8分）Oilisessentialformodernlife.About64percentoftheworld’soilislocatedintheMiddleEast,buttheheaviestconsumersofoilareEurope,America,andJapan.Theproblemliesingettingtheoilfromthecountriesthatproduceittothecountriesthatconsumeit.Thisismainlydoneusingoiltankers.Usuallytheoilisshippedsafelyandwithnoproblems,butoccasionallythereisadisaster.Everyyearmillionsoftonsofoilarespilledintotheocean.Althoughthisisonlyasmallpercentageofthetotalamountshippedaroundtheworldeachyear,thisspilledoilcanhaveterribleeffectsonoceanlife,includingthecoastlineswheretheoilwashesupontoshore.OneoftheworstoilspillsinhistoryoccurredalongtheAlaskancoastlinein1989,whentheExxonValdeztankergotstuckoffthecoastofAlaska,spilling42millionlitersofoil.Althoughitwasn’tthelargestoilspill,thedisasterwasterriblebecauseitoccurredinsuchasensitivenaturalarea.Inthisspill,thetanker’scaptain,whowastiredfromoverworkanddrinkingalcohol,hadgonetotakearest.Hegavecontroloftheshiptoanothersailor,whowasunfamiliarwiththeroute.TheshipranontoBlighReef.Damagedbythereef,theshipleakedoiloutintotheocean.Morethan1,600kilometersofcoastlinewereaffectedbytheoilspill.Manybirdsandottersdiedasaresultoftheoilcoveringtheirskin,andmanyotherseacreaturesandtheanimalsthatfedonthemwerealsoseverelyaffected.1、WhichcountryisNOTamongthelargestconsumersofoil?A．JapanB．IraqC．AmericaD．Germany2、Whatdoestheunderlined“them”referto?A．Thebirds.B．Theotters.C．Theseacreatures.D．Thebirdsandtheotters.3、Whichofthefollowingstatementistrue?A．TheoilleakofAlaskaisbecausethecaptainwasunfamiliarwiththeroute.B．Manybirdsandottersdiedfromeatingthespilledoil.C．Alaskaspillwasthemostseriousspillofalltime.D．Althoughsomeoilleakisnotserious,itwillaffectoceanlife.24．（8分）Goodnewsforcoffeeandteadrinkers:Nomorewastingtimeandenergywaitingfortheperfectcup.UsingpatentedHeatworks’OhmicArrayTechnology,theDUOSmartUntetheredCarafe(玻璃水瓶)hasthepowertoheatorcoolwatertotheexactdegreewhileyoupour.Withitsfunctionality,convenienceandstylishappearance,theDUOlookslikequitethegamechanger.Sohowdoesitwork?Theprecisetemperaturecontrolletsyoupickthewatertemperaturetotheplus/minusonedegree.Simplysetyourtemperature,pourwaterintothetank(fitsfourcups)atthetopandpourintoyourcup.Thecarafefeaturesonebluespout(出水口)forfiltered(過濾的)coldwaterandanotherredspoutforhotwater,whichappearstoheatupinstantly.Theentiredeviceisbatteryoperated,makingitperfectfortakingittotheofficeorreallyanywhereelse.Youwillalsobeabletoplugitin,sothecarafecanstaycomfortablyonyourkitchentableordesktochargeforon-the-gouse.TheDUOadvocate99percentenergyefficientlyandanadvancedwaterfiltrationsystemcreatedbyheatworksCEOJerryCallahan,whowantedtocreateaheatingsystemwithoutusingmetalheatingelements.Unsustainableandimperfectmetalheatingpartshavebeenusedforheatingforthepast100yearsandcarrytheriskofrusting(生銹).CallahanfeltItwastimeforanupgradeheatingsystems,andtheOhmicArrayTechnologywasborn.Usingelectricalcurrentspassedthroughthewateritselfratherthanseparateheatedelementstotransferheatintothewater.OhmicArraycutsoutawholestepintheprocess.TheDUOisnotyetavailableforpurchase,butyoucanlearnmoreInformationandsignupforthereleaseupdatesontheHeatworkswebsite.1、WhatdoweknowabouttheDUOcarafefromthefirstparagraph?A．Itmakesperfectcoffee. B．Itheatsorcoolswater.C．Itproduceselectricitytoheatwater D．Itprovidesfungametoplay2、Whichstepisamusttogetwaterof80°CwiththeDUOCarafe?A．Settherequiredtemperature B．CooltheboilingwaterC．Pourwaterfromthebluespout D．Addfilteredwaterintothetank3、TheOhmicArrayTechnologymakestheDUOCarafe___A．fasttocharge B．convenienttotakeC．toughandstylish D．rust-freeandtimeefficient4、What'sthemainpurposeofthetext?A．Toapplyforapatent B．TointroduceaproductC．Toreportaproductlaunch D．Toshareatechnology25．（10分）NothingcouldstopDad.Afterhewasputondisabilityforabadback,heboughtasmallfarminthecountry,justenoughtogrowfoodforthefamily.Heplantedvegetables,fruittreesandevenkeptbeesforhoney.AndeveryweekhecleanedOldManMcColgin'schickenhouseinexchangeformanure(肥料).Thesmellreallyburnedtheinsideofyournose.Whenwecomplainedabouttheterriblesmell,Dadsaidthestrongerthemanure,thehealthierthecrops,andhewasright.Forexample,justoneofhiscantaloupesfilledtheentirehousewithitssweetsmell,andthetastewasevensweeter.Asthevegetablesstartedcomingin,Dadthrewhimselfintocooking.Oneday,armedwithabasketofvegetables,heannouncedhewasgoingtomakestew(燉菜).Dadpulledoutapressurecookerandfilleditupwithcabbages,eggplants,potatoes,corns,onionsandcarrots.Forabouthalfanhour,thepressurebuiltandthevegetablescooked.Finally,Dadturnedoffthestove,thepotbegantocoolandthepressurereliefvalvesprayedoutacloudofsteam.IfwethoughtDad'spileofchickenmanurewasbad,thiswas10timesworse.WhenDadtookoffthelid,thesmellnearlyknockedusout.Dadcarriedthepotoutandweopeneddoorsandwindowstoairoutthehouse.Justhowbadwasit?Theneighborscameoutoftheirhousestoseeifwehadagasleak!Determined,Dadfilledourplateswithsteamingstewandpassedthemaround.Itdidn’tlookthatbad,andafterthefirstwavehadshutdownmyabilitytosmell,itdidn’toffendthenosesomuch,either.Itookataste.Itwouldneverwinaprizeinacookingcompetition,butitwassurprisinglyedible,andwedrankupeverylastdropofsoup!1、WhydidDadcleanOldManMocolgin’schickenhouseregularly?A．Toearnsomemoneyforthefamily. B．Tocollectmanureforhiscrops.C．Togetridoftheterriblesmell. D．Tosetagoodexampletous.2、WhatcanweinferaboutDad’sstew?A．Itispopularamongtheneighbors. B．Itcontainshoneyandvegetables.C．Itlooksverywonderful. D．Ittastesquitedelicious.3、Whatdoestheunderlinedword“offend”inthelastparagraphmean?A．Toattract. B．Toupset. C．Toair. D．Toshut.4、WhatcanwelearnaboutDadformthetext?A．Heisanexperiencedcook. B．Heisatroublesomefather.C．Hehasapositiveattitudetolife. D．Hesuffersalotfromhisdisability第三部分語言知識運用（共兩節）第一節（每小題1.5分，滿分30分）閱讀下面短文，從短文后各題所給的A、B、C和D四個選項中，選出可以填入空白處的最佳選項．26．（30分）TheYouthCommissionmeetingonlyjuststarted;Ididn’tevenwanttothinkaboutthepilesofhomeworksittingonmydeskathome.Ididn'twantedto1theyouthinvolvementintheannualholidayparadeinthemeeting,muchless2thespeechofRayD．RayD．cametoeverymeetingoftheYouthCommission.Thelocalpapers3himas“athorninpublicofficial’sside-open,honestandoveractive.”Hegavehimselfthe4of“CitizenRay”andevenworeabaseballcapwiththisnameprintedonthefront.Hecametothemeetingsand5unsafebikelanesandnoisecomplaints,6theyhadnothingtodowithour7andwecoulddonothingaboutthem.Healwayswentoverthetwo-minutelimitforguestspeakers,andwouldnotstop8untiloneofustoldhimhis9wasup.Aftercountlessnightsofstayinguptofinishmy10becauseofmeetingsthatran11,largelyduetodistractionsprovidedbyCitizenRay,Ibegantohatehis12.WhydidhewastehistimewiththeYouthCommission,whenwecouldn’t13himwithallofhisissues?14,weplannedyouthforumsandrelayedinformationaboutthetowngovernmenttoourpeers;wedidn’tfixproblemsorgiveoutbuildingpermitsthatheseemedto15.Ittookmeseveralmonthsto16understandthemotivationsofCitizenRay.Mostpeopleintheirlateseventiesare17toleavetheworkplaceandliveintherelaxationprovidedby18.RayD．,however,consideredparticipatinginthepublicgoodashisdutyasa(n)19.Hiseffortsshouldbeadmired,nothated.Afterall,Rayismotivated,dedicatedandambitious.Hispersistenceand20wouldprovevaluableinanyfieldofstudyorwork,andIrealizedIshouldvaluehispresence.1、A．continue B．enjoy C．remember D．discuss2、A．dependon B．waitfor C．listento D．referto3、A．characterized B．treated C．invited D．employed4、A．gift B．title C．position D．purpose5、A．pickedup B．wrotedown C．thoughtof D．talkedabout6、A．as B．unless C．eventhough D．asif7、A．duties B．records C．opportunities D．tastes8、A．performing B．speaking C．judging D．struggling9、A．show B．power C．time D．topic10、A．service B．report C．collection D．homework11、A．quietly B．frequently C．late D．again12、A．presence B．problem C．response D．advantage13、A．provide B．help C．reward D．associate14、A．Afterall B．Atlast C．Inall D．Forinstance15、A．observe B．change C．cause D．need16、A．naturally B．accidentally C．finally D．temporarily17、A．lucky B．brave C．safe D．happy18、A．school B．pension C．travel D．donation19、A．customer B．citizen C．professor D．officer20、A．determination B．skill C．freedom D．independence第二節（每小題1.5分，滿分15分）閱讀下面材料，在空白處填入1個適當的單詞或括號內單詞的正確形式。27．（15分）語法填空1．Ilikethebook______wasboughtyesterday.2．Hehasabook______coverisverybeautiful.3．Thereason_______hewaslatewasthathiswifewasill.4．Thisisthemostinterestingfilm______Ihaveeverseen.5．_______isknowntoall,Chinaisadevelopingcountry.6．Thesportsmeetingis_______________(hold)inourschoolnow.7．Those______breakthelawwillbepunished.8．Ihavemanyfriends,someof_______areteachers.9．Istillremembertheday______IfirstcametoShantou.10．Manynewbuildings___________________(bulid)since1980.第四部分寫作（共兩節）第一節短文改錯（滿分10分）28．（10分）假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文。文中共有10處語言錯誤，每句中最多有兩處。每處錯誤僅涉及一個單詞的增加、刪除或修改。增加：在缺詞處加一個漏字符號(∧)，并在其下面寫出該加的詞。刪除：把多余的詞用斜線(\)劃掉。修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞。注意：1、每處錯誤及其修改均僅限一詞;2、只允許修改10處，多者(從第11處起)不計分。Nowadaysmanypeopledriveinsteadoftakingabusorwalkingtowork、Itcausesmoretrafficjamandaccidents、Asthestudent,whatcanwedotoguaranteeoursafe?Firstofall,thetrafficrulesmustbestrictobeyed、Whenwecrossstreets,waituntilthetrafficlightturngreen、Next,don'tforgetwalkonthepavement、Finally,Ithinkitverydangerouslytowearheadphoneswhilewalkingorcycling、Sincewecan'tpayenoughattentiononthetrafficaroundus,soaccidentsmayhappen、Takinggoodcareofourselvesanddon'tletourparentsworryaboutus、50第二節書面表達（滿分25分）29．（25分）假如你是李華，你的美國網友Tom前些天瀏覽微博時發現一個熱搜詞“小雪”，卻發現并非真的下小雪，而是中國24節氣之一請你寫信為他稍作解釋，內容包括：1.對“小雪”節氣的說明（如：每年11月22日前后，24節氣中第20個，輕微降雪等）；2.對“24節氣”作用的說明（如：古人文化遺產之24節氣，一年分為24等份，太陽活動、季節氣候變化指導農業日常生活等）。注意：1.詞數100左右；開頭和結尾已給出，不計入總詞數；可以適當增加細節，不逐詞逐句翻譯。2.參考詞匯：熱搜詞topsearchterm，小雪slightsnow，瀏覽微博browseweibo/microblog，24節氣the24solarterms，農歷theChineseLunarCalendar。DearTom,Howiseverythingwithyou?I’mmorethandelightedtowritetoyou._______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Bestwishes!Yours,LiHua

參考答案第一部分（共20小題，每小題1.5分，滿分30分）1、C2、B3、B4、D5、C6、B7、A8、C9、A10、C11、A12、A13、C14、A15、B16、B17、A18、C19、D20、B第二部分閱讀理解（滿分40分）閱讀下列短文，從每題所給的A、B、C、D四個選項中，選出最佳選項。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(惡性的)humancells.Shesaysthecurrentwaytoidentifywhetherchemicalscausecanceristotestthemoneatatime.Thismethodleads,sheadds,toalonglistofsupposedly“safe”chemicals.Sheandherteamsaythatapproachneedstochange.“Wedefinitelyneedcertainresearch…tofindoutwhatmixturesofchemicalswouldbemoreharmfulthanothers;whatgroupsofchemicals,whentogether,wouldproducemoreharmfuleffects.Andatthemoment,thatisnotknown.”Anestimatedoneinfivecancershasbeenlinkedtochemicalexposure.Itmayturnoutthatthecancer-causingvillain(惡棍)isnotasinglechemicalatall.5、Whateffectmayonesinglechemicalhaveonusaccordingtothetext?A．Itmayletussufferfromcancer.B．Itmaynotcausedangertous.C．Itmaydestroyourbody.D．Itmayletourbodymakeachange.6、WhatcanwelearnaboutMs.Gulliver’sresearch?A．Shehasfoundreasonsforfivekindsofcancers.B．Shehasfoundthatonlyonechemicalcancausecancer.C．Shehasfound85cancer-causingchemicals.D．Sheisnotsurewhatmixturesofchemicalsaremoreharmful.7、Accordingtothetext?wecaninferthatthestudy.A．isjustwastingtimeand