2024秋高中英语单元质量评估四含解析新人教版选修6

PAGE14-单元质量评估(四)时间：100分钟分数：120分第一部分阅读理解(共两节，满分35分)第一节(共10小题；每小题2.5分，满分25分)阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。ASolarenergycollectionfacesnoshortageofproblems.Scientistshavediscoveredanotherblock(阻碍)：airpollution.Incertainpartsoftheglobe，itsinfluenceonsolarpanels(太阳能面板)candecreaseenergyoutputbymorethan25percent，accordingtoanewstudy.“MycolleaguesinIndiawereshowingoffsomeoftheirrooftopsolarinstallations，andIwasblownawaybythepanelsandcouldn'tdescribehowdirtytheywere，”saidMichaelBergin，aprofessorofenvironmentalengineeringatDukeUniversityandleadauthorofthestudy.“Ithoughtthedirtmustaffecttheirefficiency，soweputtogetheramodeltodojustthat.”WorkingwithhiscolleaguesattheIndianInstituteofTechnology­Gandhinagar，Berginmeasuredtheefficiencyoftheschool'ssolarpanelsastheybecamedirtyoverseveralmonths.Thechemicalanalysisshowedthat92percentofthedirtwasnaturaldust.Theremaining8percentpollutantscamefromhumanactivities，suchasfossil­fuelandbiomasscombustion(生物质燃烧)．Althoughthislattergroupcontributedtoasmallerpercentageoftheoveralldirtonthesolarpanels，itcanresultingreaterenergyloss，Berginsaid.Theman­madepollutantsaresmallandsticky(粘的)，makingthemmuchmoredifficulttocleanoff.Inaddition，smallerpollutantsblocksunlightmoreefficientlythannaturaldustdoes.Althoughcleaningthepanelsproducedanimmediate50percentincreaseinenergygathering，Berginwarnedagainstit.“Themoreyoucleanthem，thehigheryourriskofdamagingthem，”hesaid.“Wealwaysknewthesepollutantswerebadforhumanhealthandclimatechange，butnowwe'veshownhowbadtheyareforsolarenergyaswell，”Berginadded.“It'syetanotherreasonforpolicymakersworldwidetoadoptemissioncontrols.”【语篇解读】本文介绍了影响太阳能收集的一个简单被忽视的因素：空气污染，尤其是人类活动造成的颗粒污染，其中所占比例虽小但影响巨大。1．WhatdoestheunderlinedpartinParagraph2mean?A．Touched. B．Shocked.C．Shamed. D．Changed.解析：词义揣测题。依据其次段“couldn'tdescribehowdirtytheywere”可推断，迈克尔·伯金觉得太阳能面板很脏，这让他感到震惊。答案：B2．AccordingtoParagraph3，solarpanels________．A．shouldalwaysbeusedincleanareasB．aremainlypollutedbyhumanactivitiesC．canstopworkwhennaturaldustgathersD．workinefficientlywithman­madepollutants解析：细微环节理解题。依据第三段“Althoughthislattergroupcontributedasmaller...canresultingreaterenergyloss”可知，人类污染物会严峻降低太阳能面板收集太阳能的效率。答案：D3．WhatcanweinferfromParagraph4?A．There'snoneedtocleanoffnaturaldust.B．Peopleshouldreplacesolarpanelsfrequently.C．Solarpanelsshouldn'tbecleanedfrequently.D．Man­madepollutantsareheavierthannaturaldust.解析：推理推断题。依据第四段“Althoughcleaningthepanelsproduced...Themoreyoucleanthem，thehigheryourriskofdamagingthem”可知，太阳能面板极易因为清洁而受损，即太阳能面板并不适合频繁清洁。答案：CBAllthatextracarbondioxideblockingouratmospheremightbeusefulforsomethingnewinaprocessdescribedattheAmericanChemicalSocietymeetinginBoston，Massachusetts，thecarbonfrompiped­inairwasspunintotinynanofibres—arawmaterialusedtobuildstrongcomposites(复合材料)suchasthoseusedinaircraft，fitnessequipmentandsportscars.AteamledbyStuartLichtofGeorgeWashingtonUniversityinWashingtonDChasdesignedaprocessthatactivelyusescarbonfromtheairandturnsitintoaproductthatcanbesoldformuchmorethanthecosttoproduceit.Carbonnanofibressellforabout$25，000perton，butmakingatonofthemusingthisprocesswouldcostonlyabout$1，000.“We'retransformingtheCO2intosomethinguseful，”saysLicht.“Wehopethere'llbesignificantdemand.”Thetechniqueworksinanelectrolyticcell(电解槽)，inwhichatmosphericcarbonbreaksupinlithiumcarbonate，acommonindustrialchemical.Sofar，theteam'seffortshaverevealednounexpectedbarriers.TheelectriccurrentcouldcomefromconventionalsourcesbutLichthasalsosuccessfullyrunitonsolarpower.Ifit'susedonalargescale，theprocesscouldintheoryhaveagreateffectonfightingclimatechange.“Wecalculatethatwithaphysicalarealessthan10percentthesizeoftheSaharaDesert，ourprocesscouldremoveenoughCO2todecreaseatmosphericlevelstothoseofthepre­industrialrevolutionwithin10years，”Lichtsays.That'safearlessproject—andnoteveryonebelievesit.“I'mextremelyscepticaloftheseideas，”saysKenCaldeiraoftheCarnegieInstitutionforScienceinStanford，California.Caldeiradoubtswhetherthiskindofsolar­to­chemicalconversion(转化)isnearbeingeconomicallyworking.“Iwouldbehighlysurprisedifthesepeoplehavebrokenthisnut，”hesays.NateLewisoftheCaliforniaInstituteofTechnologyinPasadenasaysonelimitationofusingLicht'smethodonalargescalemightbethatcarbondioxidewouldbeusedup.GettingCO2fromtheatmosphereaboveanareawithhighefficiencywouldmeanthatmorewouldhavetoblowinfromelsewhereafteronlyafewhours.“Itwillrequiremuchlongertimethantheycalculate，”Lewissays.LichtsayshisunpublishedresearchshowsthatjustthehintofabreezecouldprovideenoughinflowofnewCO2toallowhisprocesstokeeprunning.Buthisteamdoesn'thaveplanstoadapttheirmethodforlarge­scalecommercialends.Lichtstressesthathislabisinterestedonlyinpioneeringthefundamental(基础的)scienceinvolved.【语篇解读】本文介绍了利用大气中的CO2制造新材料(碳纳米纤维)的一项新科技和其潜在的前景，以及外界对其可行性的质疑。4．Whowillbemostlikelytosupporttheteam'sefforts?A．Physicists. B．Astronomers.C．Physicians. D．Environmentalists.解析：推理推断题。第三段说只要不到撒哈拉沙漠面积非常之一大的地方，CO2的浓度在十年之内就可以降低到工业化前的水平。依据常识可知，CO2是公认的全球变暖的罪魁祸首，所以，这可以成为环境问题的一个解决方法。所以可以推断环保主义者会支持这项技术。答案：D5．WhatdoesKenCaldeirameanbysaying“Iwouldbehighlysurprisedifthesepeoplehavebrokenthisnut”？A．Thetechniqueisn'tquitepractical.B．Carbonnanofibresaren'tverymarketable.C．Carbonnanofibresaren'tsoenvironmentalaswethought.D．Thetechniqueneedstobeacknowledgedbymorepeople.解析：推理推断题。从画线句的上文可知，肯·卡尔德里亚怀疑这个技术的经济性，由此可知他不信任这个技术是可行的。答案：A6．Whatelsedoscientistssheddoubtonbesideseconomicalpracticability?A．Publicawarenessofcarbonemission.B．Possibleinaccuracyofdataandfiguresinvolved.C．Theirinterestonlyinfundamentalscienceinvolved.D．Failureinadaptingtheirmethodforlarge­scalecommercialends.解析：细微环节理解题。内特·刘易斯的话对他们的计算提出质疑，由此可知，他们的数据可能存在不精确的地方，这是科学家们表示怀疑的另一个缘由。答案：B7．Whichwouldbethebesttitleforthepassage?A．FightingagainstclimatechangeB．MakingnanofibresintocarpartsC．MakingcarbonnanofibrefromtheairsavestheearthD．ProtectingtheenvironmentbyreducingCO2解析：主旨大意题。本文关键信息有两个：一是明线，利用大气中的CO2制造碳纳米纤维；二是暗线，通过所举的例子表明其环境价值。故选D。答案：DCSeaiceisdrifting(漂移)fasterintheArctic—whichmeanspolarbearsneedtowalkfarthertostayintheirnativerange.Polarbearsspendmostoftheirtimewanderingtheseaiceinsearchofseals.Andsealsspendmostoftheirtimeunderneaththatice，avoidingthetoppredator(捕食者)．Butclimatechangeisgivingpolarbearsadditionalchallengesintheirsearchesforfood.“Seaiceisnowdriftingfaster，”GeorgeDurner，aresearchzoologistsaid.Heandcolleaguescomparedseaiceconditionsfrom1987to1998withthosefrom1999to2013.“Andwhatwefoundwasicedriftatthelocationsusedbypolarbearsincreased30%intheBeaufortseaand37%intheChukchisea.”That'saproblembecausepolarbearsarehomebodies—theyprefertostayinaspecificrange.“Throughouttheirrange，theyseemtohaveasenseofplace.Andherewehaveasituationwherethegeneralpatternoficedriftiswestward，sotoremainintheirtraditionalrange，itmeanstheyhavetoconstantlybewalkingeastwardtoadapttothatwestwarddrift.”Theresult：alargenumberofpolarbearswalkonthetreadmill(跑步机)．Andallthatwalkingrequiresextrafuel.Onaverage，asinglebeareatsbetween31and33sealsperyear.Butthechangeableconsequenceofthetreadmilleffectmeanstheyhavetoeatonaverageonetothreemore.GeorgeDurnerandsomeotherscientistsagreethatincreasedArcticseaicedriftmakesadultfemalepolarbears'movementsandenergieschange.Andnotonlyistheicedriftingfaster，it'salsomeltingmore，givingthebearslessoftheplatform(平台)theyusetopursuetheirprey.Sotheyneedmoresealsandwillhaveatoughertimetrackingthem.Allofthisputspolarbearsonaslipperyslope.Butmaybetheykeepexpectingmoretroublewhilegrowingup.【语篇解读】气候的变更使北极熊面临新的挑战。8．WhatcanwelearnfromParagraph3?A．GeorgeDurnercollectedthedatabyhimself.B．Polarbearsalwayschangetheirlivingrange.C．Theresearchwascarriedoutbymakingcomparisons.D．Icedriftattheplaceswherepolarbearsliveincreasedby7%.解析：推理推断题。依据第三段中“Heandcolleaguescomparedseaiceconditionsfrom1987to1998withthosefrom1999to2013.”及下文可知，探讨者主要通过比较冰块的状况来实施项目探讨。答案：C9．Onaverage，howmanysealsdoesabeareatatleasthalfayearafterclimatechange?A．13. B．16.C．31. D．32.解析：数字计算题。依据文章第四段“Onaverage，asinglebeareatsbetween31and33sealsperyear...onaverageonetothreemore.”可知，气候变更后导致每只北极熊每年平均捕食海豹至少31＋1＝32只，半年则为16只。答案：B10．Whatdoesthepassagemainlytalkabout?A．Iceismeltingmoreanddriftingfaster.B．Moresealsarewalkingeastward.C．Thepolarbearsprefertoliveinthesameplace.D．Climatechangeaffectspolarbears'survival.解析：主旨大意题。总观全文，作者主要围绕气候变更导致北极熊为了生存必需像在跑步机上行走一样可知，气候变更影响了北极熊的生存。答案：D其次节(共5小题；每小题2分，满分10分)依据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。FormostAmericans，plasticbagsareanecessarypartofanyshoppingtrip.11.________Butplasticbagsthatendupinoceansandonbeachesareharmfultofish，birdsandotherwildlife.SeveralcitiesaroundtheUShaveeitherbannedsingle­useplasticbags，tax(征税)them，orfindotherwaystolimittheiruse.Thosewhosupportabagtaxsayitencouragespeopletobringreusablebags.12.________Butcriticsarguethattaxingtheuseofplasticbagsputsunfairstressonlowincomefamilies.Heretwostudentssharetheirviews.GrantGordinier，11，fromSanDiego，California，says，“13.________Everyyear，485billionplasticbagsarenotrecycled.Someendupintheoceanandcancauseharmtosealife.Placingasmalltaxonplasticbagsmightencourageshopperstobringtheirownreusablebagstostores.Reusablebagswouldcutdownonwasteintheenvironment.Businesseswouldalsosavemoneybynothavingtoprovideasmanyplasticbagstocustomers.”However，ElleBelperio，12，fromLosAngeles，California，hasdifferentopinions.“14.________Somegrocerystores(杂货店)havebinsforshopperstorecycleusedbags.Otherstoresrewardindividualefforts.Theygiveasmallrefund(退款)everytimeashopperuseshisorherownbag.Ifyoureuseandrecycleyourplasticbagproperly，youwillnotbehurtingtheenvironment.Iknowmanyfamiliesreusethemtopickupaftertheirdogs.15.________Instead，thegovernmentshouldeducatepeopleinwaystoreuseandrecyclethem.”A．NewYorkCitywillalsobanplasticbags.B．Therearemanywaystoreuseplasticbags.C．Inmyhome，wefindmanyusesforthebags.D．Besides，theythinkithelpscutdownonwastes.E．Communitiesshouldlimittheuseofplasticbags.F．Idon'tthinkcommunitiesshouldtaxplasticbags.G．Manypeopleseldomthinkofthebags'influenceontheenvironment.【语篇解读】本文是一篇争论文。社区应当通过征税限制塑料袋的运用吗？两名学生给出了他们的观点。11．解析：由该空后的“Butplasticbags...areharmfultofish，birdsandotherwildlife”可知，G项“许多人很少会想到塑料袋对于环境的影响”符合此处语境。答案：G12．解析：由语境可知，此处承接上句阐述对塑料袋征税的另一个好处，故选D项。答案：D13．解析：由本段的描述可知，格兰特·戈丁纳支持对塑料袋征税，故E项内容“社区应当限制塑料袋的运用”符合此处语境。答案：E14．解析：由该空前的“hasdifferentopinions”以及该空后的“Somegrocerystoreshavebins...Otherstoresrewardindividualefforts”可知，艾尔·贝佩里奥持不同的观点，他认为有许多方法可以重复运用塑料袋。答案：B15．解析：由该段的描述和该空后的“Instead，thegovernmentshouldeducatepeopleinwaystoreuseandrecyclethem”可知，艾尔·贝佩里奥不支持对塑料袋征税。答案：F其次部分英语学问运用(共两节，满分45分)第一节完形填空(共20小题；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四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。XiuhtezcatlMartinezisn'tatypical16­year­old.First，there'shisAztec__16__，whichishardtopronounce.Thenthere'shislonghair，whichhasneverbeencut.Butwhat'smost__17__aboutXiuhtezcatlisnothisnameorhowhelooks.It'showhe__18__histime.Whilemostteensare__19__withsports，friends，andYouTube，Xiuhtezcatlisworkingto__20__theplanet.“Icallmyselfawarrior(勇士)fortheEarth，”hesays.Hepointsoutthatclimatechangeisahugeand__21__problem.Xiuhtezcatlbeganlookingforsolutionswhenhewasjustalittlekid.Hisoldersistersandbrothersrana(n)__22__groupcalledEarthGuardians，whichwasstartedbytheirmum.Firsthesneaked(偷偷溜进)intotheirmeetingstolisten.Soonhewastravellingaroundthecountry—andtheworld.His__23__？Toeducateandinspirepeopleto__24__thefightagainstclimatechange.Today，XiuhtezcatlrunsEarthGuardians.Thegroup__25__withthousandsofkidsaroundtheglobe.Hespeakstostudentsinclassroomsabout__26__theycantaketohelptheplanet.Andhewritesandperformship­hopsongsabouttheenvironment.Xiuhtezcatl__27__thatifmanypeopleadjusttheirhabits，wecan__28__thecausesofclimatechange.“Therearesomanywaysto__29__inyourownlife，”hesays.“__30__changescanhaveahugeinfluence.Turnoffthewaterandlights.Uselessplastic.__31__yourownfood.”He__32__hismessageonTV，online，andthroughhismusic.Andhegivesspeechestoworldleadersandpresidentialcandidates，askingthemtousetheir__33__tostopclimatechange.“Climatechangesoundsscary，”Xiuhtezcatlsays，“__34__it'spossibletodefeatit.Wecan__35__theEarth，theair，thewater，andtheatmospheresomygenerationwillliveonasafe，healthyplanet.”【语篇解读】本文是一篇记叙文。文章介绍了一位别出心裁的16岁男孩——地球爱护勇士XiuhtezcatlMartinez。16．A.word B．nameC．opinion D．accent解析：由下文中的“aboutXiuhtezcatlisnothisnameorhowhelooks”可知，XiuhtezcatlMartinez的名字(name)来自(墨西哥)阿兹特克语，很难发音。答案：B17．A.popular B．interestingC．unusual D．mysterious解析：由上文中的“XiuhtezcatlMartinezisn'tatypical16­year­old.”和下文介绍他致力于环境爱护可知，令Xiuhtezcatl与其他16岁男孩别出心裁的(unusual)既不是他的名字也不是他的外表，而是他如何度过(spends)他的时间。答案：C18．A.keeps B．setsC．spends D．values解析：参见上题解析。答案：C19．A.busy B．boredC．careful D．angry解析：由下文中的“IcallmyselfawarriorfortheEarth”可知，当大多数青少年忙(busy)于参与体育运动、交友、上社交网络的时候，Xiuhtezcatl正致力于挽救(save)地球。答案：A20．A.design B．saveC．control D．record解析：参见上题解析。答案：B21．A.strange B．unavoidableC．frightening D．short­term解析：由下文中的“Climatechangesoundsscary”可知，他认为气候变更是一个巨大且令人胆怯 的(frightening)问题。答案：C22．A.charitable B．culturalC．political D．environmental解析：由下文提到的“fightagainstclimatechange”和“XiubtezcatlrunsEarthGuardians...tohelptheplanet”可知，EarthGuardians是一个与环境有关的(environmental)组织。答案：D23．A.view B．goalC．secret D．standard解析：由下文介绍Xiuhtezcatl在环保方面所做出的努力可知，他环游世界的目标(goal)是教化并启迪人们加入(join)到应对气候变更的活动中来。答案：B24．A.feel B．joinC．stop D．watch解析：参见上题解析。答案：B25．A.travels B．livesC．talks D．works解析：由下文中的“Hespeakstostudentsinclassrooms”可知，环保组织EarthGuardians与全球的孩子们共同工作(works)。答案：D26．A.orders B．stepsC．rules D．roles解析：作为环保组织EarthGuardians的管理者，Xiuhtezcatl要在课堂上给学生们讲解实行什么措施(steps)来爱护地球。答案：B27.A．doubts B．admitsC．believes D．remembers解析：由下文Xiuhtezcatl列举变更自我习惯的方法“Turnoffthewaterandlights...yourownfood”可知，作为一个爱护地球的勇士，Xiuhtezcatl信任(believes)假如大家能调整自己的习惯，我们就能够削减(reduce)导致气候变更发生的缘由。答案：C28．A.show B．reportC．reduce D．discover解析：参见上题解析。答案：C29．A.giveway B．standoutC．makemistakes D．takeaction解析：下文介绍的“Turnoffthewaterandlights...yourownfood”都是生活中我们为削减气候变更的发生可以实行的行动(takeaction)。答案：D30．A.Rapid B．SmallC．Global D．Seasonal解析：关掉水电、尽量少运用塑料和自己种植(Grow)食物都是一些小(Small)却能起到巨大影响的变更。答案：B31．A.Choose B．BuyC．Grow D．Eat解析：参见上题解析。答案：C32．A.leaves B．sharesC．receives D．forms解析：Xiuhtezcatl不仅通过课堂来传播他爱护地球环境的意识，还会通过电视、网络、歌曲来共享(shares)他的环保主见。答案：B33．A.money B．powerC．time D．courage解析：由上文中的“worldleadersandpresidentialcandidates”可知，Xiuhtezeatl希望世界领导人和总统候选人可以利用他们的影响力(power)来阻挡气候变更。答案：B34．A.and B．orC．so D．but解析：“气候变更听上去可怕”与“它有可能被扼制”之间是转折关系，故用but。答案：D35．A.change B．followC．protect D．respect解析：由下文中的“mygenerationwillliveonasafe，healthyplanet”可知，只有爱护(protect)好地球、空气、水以及大气层，我们才能生活在一个平安又健康的星球。答案：C其次节(共10小题；每小题1.5分，满分15分)阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。TheGreatBarrierReefisoneofEarth'sgreatest36.________(nature)wonders.It'sthelargestsystemofcoralreefs(珊瑚礁)intheworld.Thecolourfulunderwaterhabitatprovidesfoodandsheltertomanyseaanimals.Butin2024，scientistsflyingoverthereef37.________(shock)bywhattheysaw.“Whereyouexpected38.________(see)colourfulhealthycorals，whatyousawwasjustwhite，”saysscientistMarkEakin.Whatthescientistssawisaconditioncalledcoralbleaching(珊瑚白化)．It'sawarningsignthatthereefis39.________serioustrouble.Expertssay40.________isrisingoceantemperaturesthataremostlytoblame.Coralreefslooklikeplants，butthey're41.________(actual)tinyanimalsthatlivetogetherinhugegroups.Coralsgettheirnutrientsfromtinyplant—likelivingthingscalledalgae(海藻)．Thealgaeliveinsidecoralsandgive42.________(they)theircolour.Butwhentheoceangetstoowarm，coralsreleasethealgae.As43.________result，thecoralsgetbleachedwhite.Scientistssaythatbleachingisbecomingmorewidespreadasoceansgetwarmer.Somecoralscanrecoverfrombleachingasthewater44.________(cool)inwinter，butthatisgettinglesslikelyaswinteroceantemperaturesrisetoo.Reefsworldwidesufferfrom45._______(pollute)，overfishing，andotherdangers，butscientistssayclimatechangeisthebiggestthreat.Theypredictthatnearly90percentofallreefswilldisappearby2050.【语篇解读】本文主要讲了珊瑚白化的相关事情。36．解析：考查形容词作定语的用法。设空处作定语修饰wonders，故填natural(自然的)。答案：natural37．解析：考查一般过去时的被动语态。主语scientists与shock之间是被动关系，且由时间状语in2024可知，设空处表示的动作发生在过去，故填wereshocked。答案：wereshocked38．解析：考查不定式作宾语的用法。expecttodosth意为“期望做某事”。答案：tosee39．解析：考查介词。introuble意为“处于逆境中，有麻烦”。答案：in40．解析：考查it的用法。设空处所在句是强调句型，强调risingoceantemperatures，故填it。答案：it41．解析：考查副词。设空处修饰系动词are，故填actually。答案：actually42．解析：考查代词。设空处作宾语，指代前面的corals，故填them。答案：them43．解析：考查不定冠词。asaresult意为“结果”。答案：a44．解析：考查一般现在时。设空处描述的是客观事实，应用一般现在时，故填cools。答案：cools45．解析：考查名词。设空处与overfishing以及otherdangers并列作from的宾语，故填名词pollution。答案：pollution第三部分写作(共两节，满分40分)第一节应用文写作(满分15分)假定你是李华，你的英国网友John即将外出旅行，请给他写一封信，谈谈你的想法。内容包括：(1)你对旅行的看法；(2)旅行前的打算；(3)旅行时要留意的问题。留意：(1)词数80左右；(2)可适当增加细微环节，以使行文连贯。__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________答案：DearJohn，Iamgladtohearthatyouaregoingtotravel.Inmyopinion,travellingisaverygoodactivity.Whenyougettiredofyourstudyandhavefreetime，youcangoouttoenjoythebeautyofnature.Whentravelling，youcanmeetdifferentpeopleandmakefriendswiththem.Inordertohaveapleasantjourney，you'dbetterknowabouttheweatherconditionsandtakeproperclothes.Remembertotakesomemedicineforcommoninjuriesanddiseaseswithyou.Onyourjourney，youmustpayattentiontowhatyoueat.Wishyouagoodjourney.Yours，LiHua其次节概要写作(满分25分)阅读下面短文，依据其内容写一篇60词左右的内容概要。Myweighthasbeenalifelongproblemforme.ThefirsttimeIwentonadiet，Iwasin9thgrade.BythetimeIgraduatedfromhighschool，Iwas150pounds.I