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已知函数f(x)=|x﹣2|,g(x)=f(x)﹣2|x|. (1)求g(x)的最大值m; (2)若a>0,b>0,且=m,求证:f(a+3)+f(b+1)≥4.
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高二下学期数学《》真题及答案
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Mr.PeterJohnsonagedtwenty﹣threebattledforhalfanhourtoescapefromhistrappedcaryesterdaywhenitlandedupsidedowninthreefeetofwater.Mr.Johnsontooktheonlyescaperoute﹣﹣throughtheboot行李箱. Mr.Johnson'scarhadfinishedupinaditch沟渠atRomneyMarsinKentafterskiddingoniceandhittingabank.FortunatelythewaterbegantocomeinonlyslowlyMr.JohnsonsaidIcouldn'tforcethedoorsbecausetheywerejammedagainstthewallsoftheditchanddarednotopenthewindowsbecauseIknewwaterwouldcomefloodingin. Mr.JohnsonasweetsalesmanofSittingHomeKentfirsttriedtoattracttheattentionofothermotoristsbysoundingthehornandhammeringontheroofandboot.Thenhebeganhisstruggletoescape. LaterhesaidItwasreallyahalfpennythatsavedmylife.ItwastheonlycoinIhadinmypocketandIusedittounscrewthebackseattogetintotheboot.Ihammereddesperatelywithahammertryingtomakesomeonehearbutnohelpcame. Ittooktenminutestounscrewtheseatandafurtherfiveminutestoclearthesweetsamplesfromtheboot.ThenMr.Johnsonfoundawrenchandbegantoworkonthebootlock.Fifteenminutespassedby.ItwastheonlychanceIhad.FinallyitgavebutassoonasImovedthebootlidthewaterandmudpouredin.Iforcedtheliddownintothemudandscrambledclearasthecarfilledup. HishandsandarmscutandbruisedMr.JohnsongottoBeckettFarmnearbywherehewaslookedafterbythefarmer'swifeMrs.LucyBates.TremblinginablankethesaidThatthirtyminutesseemedlikehours.Onlythetipsofthecarwheelswerevisiblepolicesaidlastnight.Thevehiclehadsunkintotwofeetofmudatthebottomoftheditch. 1Inwhichsectionofanewspapercanwereadthisarticle? A.Bookreview B.Newsreport C.Campuslife D.Continuedstory 2TheunderlinedsentenceinParagraph5Finallyitgavemeansthat. A.luckilythedoorwastornawayintheend B.atlastthewrenchwentbroken C.thelockcameopenafterallhisefforts D.thechancewaslostatthelastminute 3Itcanbeinferredfromthepassagethat. A.theditchwasalongaquietcountryroad B.theaccidenthappenedonaclearwarmday C.thepolicehelpedMr.Johnsongetoutoftheditch D.Mr.Johnsonhadatenderwifeandwaswellattended
Wehaveagrowingpopulationandtweneedmorefood.
WhilecheckingoutatthegrocerystoreInoticedawomanbehindme.Shewas1oneofshoppingcartswiththebasketinfront.Thebasket2justafewitemssomeapplesaloafofbreadsomecannedgoodsanda3ofcoral﹣coloredroses.I4toherthattheywereindeedverylovelyroses.ShesaidIreallydolovethemthey'remyfavorite5. WelljustasIwasleavingIheardhersaytothecashierYoucan6thebunchofrosesbackIreallycouldn't7them.Iturnedaroundandaskedherifshewould8metogetthemforher.She9herheadandsaidWhywouldyouwanttodothat?Youcertainlydon'thaveto.IrepliedthatIjustwantedto10sinceshelovedthemsomuch.Shestillseemed11.SoItoldher12shewouldallowmeto13themtohershewouldbedoingmeafavor.WithtearsinhereyesshesaidIreallydolovethem.Thanks.AsI14thecashierthemoneyfortherosesInoticedhewasalittle15aswell. OnthewayhomeIwasreminded16asongIhadhearddecadesagoandI'velovediteversince.Thesongis'BreadandRoses'.It'sabeautifulsongonmanylevelsandremindsusthatwe17needfoodbutweallalsoneed18. Alinefromthissongfitsthissituationperfectly.It19Heartsstarveaswellasbodies.Giveusbreadbutgiveus20too. 1A.driving B.holding C.dragging D.pushing 2A.held B.Put C.presented D.produced 3A.box B.bunch C.basket D.handful 4A.Showed B.commented C.introduced D.recommended 5A.smell B.shape C.color D.memory 6A.deal B.put C.pick D.come 7A.make B.collect C.manage D.afford 8A.allow B.advise C.want D.prefer 9A.nodded B.shook C.lowered D.raised 10A.partly B.especially C.specially D.merely 11A.puzzled B.shocked C.hesitant D.Regretful 12A.if B.but C.only D.just 13A.owe B.pass C.gift D.deliver 14A.charged B.awarded C.offered D.handed 15A.teary﹣eyed B.starry﹣eyed C.weary﹣eyed D.sharp﹣eyed 16A.of B.for C.to D.if 17A.notif B.notbut C.noteven D.notonly 18A.love B.share C.money D.beauty 19A.reads B.sings C.speaks D.shows 20A.goodness B.roses C.comfort D.medicine
WhenIpackedupmylifeandmovedfromthecomfortsofmylittlehometowntoWacoIrememberfeeling1lose.AllmyfriendsweresoexcitedtostarttheirownlivesbutIjustwasn'tsure2Iwasreadyforthatyet.Manythingsworriedme.ButIhidmyfearsandwhenthetime3finalcameIhuggedmymothergoodbyemadethetwo﹣hourone﹣waydrivefromCoppeltoWacoandsetupmynewroom. ForthefirstfewweeksIdidn'tmisshomeorreallyfeelanykindofemotionatallexcepttired.Therewassomuchformetolearn4Ihadn'thadtimetothinkaboutanything.Myenergy5directtowardsfiguringoutcampusadjustingtocollege﹣levelclassesandrememberingthenamesofeverynewpersonImet.Iexploredeverycorner6lookfortheperfectplacetostudy.Ilearnedtoset7IascheduleofgettinggroceriescleaningmyroomanddoingmylaundryonSundays. NowadaysinmysecondsemesterIfeellikeIhavealmostadapted8theuniversitylife.Thetransitionfromhighschooltocollegewasn't9difficultasmymindmademethinkitwouldbe.Oneofthebest10thingcollegehastaughtmeishowtobeindependent.
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AphotographthatonehastakenofoneselftypicallywithasmartphoneorwebcamanduploadedtoasocialmediawebsiteisthedefinitionofselfieintheOxfordEnglishDictionary.Infactitwasn'teveninthedictionaryuntilAugustoflastyear.Itearneditsplacetherebecausepeoplearenowsoobsessedwith对……痴迷selfies﹣wetakethemwhenwetryonanewhatplaywithourpetsorwhenwemeetafriendwhomwehaven'tseeninawhile. Butisthereanyscientificexplanationforthisobsession?WellyoushouldprobablyaskJamesKilneraneuroscientist神经系统科学家atUniversityCollegeLondon. Throughourlifetimewebecomeexpertsatrecognizingandinterpretingotherpeople'sfacesandfacialexpressions.IncontrastaccordingtoKilnerwehaveaverypoorunderstandingofourownfacessincewehavelittleexperienceoflookingatthem﹣wejustfeelthemmostofthetime. ThishasbeenprovedinpreviousstudiesaccordingtotheBB24C. Kilnerfoundthatmostpeoplechosethemoreattractivepicture.Thissuggeststhatwetendtothinkofourselvesasbetter﹣lookingthanweactuallyare.TofurthertesthowweactuallyperceiveourownfacesKilnercarriedoutanotherstudy.Heshowedpeopledifferentversionsoftheirownportrait﹣theoriginalonethathadbeeneditedtolooklessattractiveandonethatwasmademoreattractive﹣andaskedthemtopicktheversionwhichtheythoughtlookedmostlikethem.Theychosethemoreattractiveversion. Butwhatdoesitsayaboutsettles?Wellisn'tthatobvious?Selfiesgiveusthepowertocreateaphotograph﹣bytakingitfromvariousangleswithdifferentposesusingfilters滤色镜andsoon﹣thatbettermatchesourexpectationswithouractualfaces. Yousuddenlyhavecontrolinawaythatyoudon'thaveinnon﹣virtual非虚拟的interactionsKilnertoldtheCanada﹣basedCTVNews.Selfiesallowyoutokeeptakingpicturesuntilyoumanagetotakeoneyou'rehappywithheexplained. 1Whatisthepassagemainlyabout? A.Thedefinitionandfunoftakingselfies. B.Theexplanationofwhypeoplelovetakingselfies. C.Howtakingselfiesinfluencespeople'sdailylives. D.Howtointerpretpeople'sfacialexpressionsintheirselfies. 2TheunderlinedwordperceiveinParagraph5canbereplacedby. A.interpret B.beautify C.choose D.destroy 3AccordingtoKilnerpeopleliketakingselfiesprobablybecausetheythink. A.itisagoodchancetolearnmoreabouttheiractualfaces B.itisawaytorespondtoothers'facialexpressionscorrectly C.itenablesthemtointeractwiththeirfriendsinsocialmedia D.itallowsthemtosatisfytheirexpectationswiththeirappearances
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DaniellaWridewasbrushingherdaughter'slongbrownhairwhenshenoticedthatwitheachcombmassesofthehairwerecomingout.ThatwasJanuary12017.Within20daysseven﹣year﹣oldGianessaWride'shairwascompletelygoneandherdoctorsaidthehairwouldnevergrowback.Gianessahadbecomeoneofthe6.8millionAmericanswithalopeciaanauto﹣immunediseasethatcauseshairloss. Alopeciaisn'tpainfulbutforkidswhosufferfromittheseverepaincomesfromstandingoutfromthecrowd.ForthemostpartthestudentsinGianessa'sfirst﹣gradeclassinSalemUtahwereunderstanding.ButtheoccasionaljokesofBaldymadeherfeellikeanabandonedchild.Ididn'twanthertofeelthatshewasn'tliketheotherkidshermothersaid.Itriedcoveringherbaldnessbuttheman﹣madehairwasuncomfortable. Thencomestheschool'straditionalCrazyHairDayinAprilagreatjust﹣for﹣funcelebrationwhereallthekidsandtheirparentscanexpresstheirwildsidesabit.DaniellaandGianessadecidedthatratherthanhideGianessa'sbaldnessundertheman﹣madehairtheywouldcelebrateit.Daniellaboughtscrapbook﹣stickerjewelsanddecoratedherheadwithflowereddesignsandevenadeer.TheyjustfitherpersonalityDaniellasmiled.She'ssolovely. OnthemorningofthecompetitionGianessawasnervous.Wouldherfriendsthinkitwasfunny?Howeverwithhermother'sencouragementshehadnothingtofear.ImpressiveGianessawasahitandawinnerofthecrazy﹣haircompetition.Gianessaisnowgladthatshedaredtogobare.IwassadatfirstwhenIlostallmyhairshetoldpeople.ButnowIlovebeingbald.Icandothingstomyheadthatotherkidscan't.I'mthinkingnowitmightbefuntodecoratemyheadwithsomecolorfulbutterfliesandflowers. 1WhywasGianessadifferentfromotherkids? A.Shewasbornbald. B.Shehadherheadfullyshaved. C.Shewastalentedinhairdesigning. D.Shesufferedfromhairloss 2HowdidothersreacttoGianessa'sdisease? A.Herdoctorwasquiteoptimistic. B.Hermothergaveherman﹣madehair. C.Herclassmateswereallconsiderate. D.Herschoolneverofferedherhelp. 3WhatcouldGianessadoontheCrazyHairDay? A.Shecouldshowherpersonality. B.Shecoulddecorateherhair. C.Shecouldshopscrapbook﹣stickers. D.Shecouldteaseothers. 4Whatisthemainideaofthetext? A.Theman﹣madehairbuiltupthegirl'sconfidence. B.Thegirlfacedherdiseaseinamostbeautifulway. C.Thecompetitionservedasawaytomakeachange D.Thediseasewascuredwithmother'sloveandcare.
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Therehasbeenanoutpouringoflovefora23﹣year﹣olddisabledwomanwhosedogwaskilledinfrontofherwhileagroomer美容师triedtotrimitsclaws. CallsandemailscamefromasfarawayastheUpperPeninsulaandArizonaaswellasOaklandandMacombcountiesofferingLaurieCrouchwhousesawheelchairbecauseofmultiplesclerosis硬化症everythingfromdogstomoneysuchasthatfromJasonDalyofRosevillewhosaidIwouldliketobuyheranewdog. AstoryaboutthedeathofCrouch'spetGoochwasprintedonthefrontpageofMacombDaily.CrouchsaidagroomertiedGoochupwithacollarandthensheandamansatonthedogtotrim修剪itsnails.Goochdiedafteroneclawwastrimmed. CrouchyelledatthegroomertostopwhenshesawGoochwasstrugglingtobreathebutshesaidshewasignored.IfIcouldhavewalkedIwouldhaveputmyhandsonherandpulledheroffmydogandphysicallystoppedherbutIcan'tdothat.GoochwasnotatrainedserviceanimalbutnaturallyhelpedCrouchbypickingupthingsforher. Thiscaseisabsoluteanimalabuse虐待LarryObrechtdivisionmanageroftheOaklandCountyAnimalShelterinAuburnHillssaid. PeoplewhoreadthestorycontactedOaklandPresstoofferhelp.AmessagefromRebeccaAmettofGigglesNWigglesPuppyRescueinRosevillesaidWehavepuppiestodonateandwanttohelptheyoungwomanwholostherservicedog. WhenGoochwaswithmeIwashappyCrouchsaidIthinkIcanbehappyagainbutnoanimalcanreplaceGooch.There'snevergoingtobeanotherGoochouttherebutIthinkIwillfindadogthatcanbringmejoyagain. 1Peoplecalledandemailedto. A.givetheirangryvoicetothegroomer B.offerhelpandcaretoLaurieCrouch C.tellCrouchhowtopunishthegroomer D.offeracureforCrouch'sdisease 2Goochdiedmainlybecause. A.thegroomerwascareless B.thegroomerdidn'tknowhowtotrimthedog'snails C.thegroomersatonthedogwithanotherman D.thedogwaswearingacollar 3WhatdoweknowaboutCrouch'sdog? A.Itwasaspeciallytrainedservicedog. B.Itwastrainedtodomanythingsforpeople. C.ItwasCrouch'sonlyfriend. D.ItcouldoffersomehelptoCrouch. 4Whatdoesthepassagemainlytellus? A.Adisabledwoman'sservicedog. B.Acruelgroomerkilledadisabledwoman'sdog. C.People'sloveforadisabledwomanwholostherdog. D.Adisabledwomanlovestohavethedogascompany.
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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. Manychildrentakewhattheirparentsdoforthemforgranted.Theyhaven'trealizedthemeaningofbeinggrateful.Buttheyalwaysgetangrywiththeirparentbecausetheydon'tgetwhattheywant.Myfriendoncetoldmenewsthatalittlegirlwentoutofthehouseandrefusetoreturnhomeasherparentsdidnotgiveherenoughpocketmoney.Iwassoshockingtohearit.IwouldneveraskmuchfrommyparentsbecauseIknewitwasnoteasyforhimtomakealiving.AndIalwaysfeelsothankfulforthattheyhaveofferedtome.IfsomeonewhogivesmeahandwhenIaminneedIwillrememberhimandifIrealhaveachanceIwillpayhimback.Inshortitisagratefulheartthatmakesusbecomekindpeopleandcreateaharmoniousenvironment.
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Hefoundhimself包围bykindness.
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扁桃酸Z是重要的医药合成的中间体工业上合成它的路线之一如图所示不考虑立体异构 下列有关说法错误的是
假设你是南阳中学的学生李华将参加主题为Let'spickupabookandread的英语演讲比赛.请你写一份演讲稿主要内容包括 1.目前很多学生课余时间沉溺于网络远离书本导致记忆力减退对学习失去兴趣等问题. 2.阅读的益处如开阔视野增强理解力提高成绩等. 注意1.词数100左右.演讲稿开头和结尾已给出但不计入总词数. 2.可适当增加细节以使行文连贯. Goodmorningeveryone I'mLiHuafromNanyangMiddleSchool.ThetopicofmyspeechisLet'spickupabookandread. Thankyou!
IntheUSAColumbusDayisinmofthearrivalofChristopherColumbusintheNewWorld.
It'sasadandfamiliarvoicethatweoftenhearinbigcitiesCanyousparesomechange? Usuallywhenfacedwiththatparticular1IhavefeelingsofguiltifIpassby2givingacoinortwo. Ihadthatfeeling3inVenicewhileonatourofItaly'sfamoussitesin2006.Ihadtakenrefugefromthe4inaquietcafé.Outsidetherewasanoldwomankneelingonthehardancientpavingstones5. Steady6oftouristswerewalkingpasther.Ayoungbackpackerstoodawayfromthecrowd7drinkinginthescenerybutInoticedtheyoungtravelerwasalso8theoldwoman. Atouristgroupwalkedalongthestreet9thewomanandwalkedon.10groupoftouristsarrivedandwalkedpasttheoldlady.Thebackpackerwatched11everybodyelsewentontheirwayfocusedonthe12aroundthem.ThenIwaspreparingtoleavewhenIcaughtsightofthebackpackersteppingforwardand13somemoneyinthewoman'scup.Hedidthissomewhat14justbeforethearrivalofanothertouristgroup.AsI15theleaderofthegroupstoppedandputsomemoneyinthecup.Havingbeenshownthewayothertouristsfollowedsuitand16somemorecoinstothecup. Hisworkdonetheyoungmanwalkedovertotheoldbeggar﹣womanpattedherontheshoulderandsaidIhopethat17alittle. Idon'tknowifthewomanunderstoodhisEnglishor18whathadjusthappenedbutIdid. Iplacedsomemoneyinthewoman'scupandcontinuedmytravels19afterwitnessingsuchan20actofkindness. 1A.sound B.question C.excuse D.command 2A.beyond B.after C.without D.before 3A.manytimes B.sometimes C.onlyonce D.onceagain 4A.crowds B.families C.streets D.signs 5A.singing B.crying C.begging D.trembling 6A.streams B.packs C.masses D.groups 7A.simply B.seemingly C.similarly D.specially 8A.showing B.following C.checking D.observing 9A.glancedat B.laughedat C.rushedat D.staredat 10A.One B.More C.Another D.Other 11A.if B.since C.because D.as 12A.stones B.sights C.signs D.tourists 13A.lending B.borrowing C.placing D.taking 14A.accidentally B.successfully C.deliberately D.cheerfully 15A.watched B.shown C.understood D.walked 16A.changed B.charged C.found D.added 17A.measures B.helps C.explains D.matters 18A.recognized B.caught C.realized D.figured 19A.pleasant B.annoyed C.disappointed D.delighted 20A.beautiful B.admirable C.pure D.accurate
Abdietandregularphysicalactivitywillhelpyoukeepfit.
ThemusicwaswrittenbyAbingafolkmwhowasborninthecityWuxiin1893.
BothEnglishandFrenchareolanguagesinCanada.
难以相信的是itactuallyworks.
HowtomakeQuickDecisionsForYourLife Wemakedecisionseveryday.1Whenitcomestomakingdecisionschoosingtherightonecanattimesbestressfulespeciallyifthedecisionmustbemadequickly.Indecisionoftenweighsusdownbuttherearesomeusefultipsformakingquickdecisionsmoreeasily. 2Sometimesthekeytomakingaquickdecisioncomesdowntoplanningaheadoftimeforjustsuchanoccasion.Weallknowwe'regoingtocometoanimportantdecision﹣makingpointsoonerorlatersohavingaplanalreadyinhandcanputourmindateasewhenthattimecomes. Overcomefear.3Whileitmayseemdifficulttoovercomethefearofmakingthewrongchoicemanyexpertsagreethatweshouldn'tbeafraidtomakethewrongdecisionevenifitseemsimportant.Thevastmajorityofwrongdecisionscanbecorrectedwhiledelayingdecisionscanoftenleadtomoreproblems. Writedownalltheadvantagesanddisadvantagesofyourdecision.Evenifyoudon'thavealltheinformationwritingdownalltheprosandcons优缺点isagoodstartingpointforfiguringoutwhattodo.Incaseswheretheresimplyisn'tenoughtimetowritethingsdownmakeamentallistinyourmind.Thinkingoftheprosandconscanhelpyouorganizeyourthoughts.4 Determinecriteria.Rememberthateverydecisionyoumakeshouldcomewithacertainlistofcriteria.5Butonceyouknowtherequirementsyou'relookingformakingadecisionwillbecomeeasier.Lookforthechoicethatsatisfiesthelistyou'vemadeandoncethatchoiceisfoundyoushouldmoveaheadwithit. A.Haveaplan. B.Thelistmaybeshortorquitelong. C.Communicateyourdecisionwithothers. D.Andthiscanalwaysleadtoaclearanswer. E.Socutoutanyoptionsthatyouknowyouwillnotchoose. F.Oftenonethingthatkeepsusfrommakingdecisionsisfear. G.Somecanbeveryimportantwhileothersarenotseriousinthelongrun.
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