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已知函数f(x)=﹣x3+x2,g(x)=alnx. (Ⅰ)若y=f(x)﹣g(x)在(0,+∞)上是减函数,求a的取值范围; (Ⅱ)设h(x)=对任意给定的正实数a,曲线y=h(x)上是否存在...
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高三下学期数学《》真题及答案
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Theideaofrobotrulersfriendsandlovershasbeenatopicofsciencefictionnovelsforyears. Butaccordingtoonemathematicalmodelofhowourbrainscreateconsciousnessemotionalmachineswillneverexist. Thisisbecausecomputerscan'thandleanyprocessthatcompletelyintegrates整合informationsotheycannotbeconsciousorfeeloneexpertsays. AmathematicalmodelforconsciousnessdevelopedbyGiulioTononiattheUniversityofWisconsin﹣Madisonsaysthattheabilitytointegrateinformationisakeyfeatureofconsciousness. Hebelievesthatintegratedinformationcan'tbebrokendownintosmallerpiecesinconsciousmindsbecausethebraincontextualizes将……融入背景information. Forexamplewhenweseearedcircleourbrainsdon'tseetheshapeasacolourlesscircleplusashapelesscolouredareaNewScientistreported.Insteadweseeitasawhole﹣aredcircleweunderstandthewiderpicture. It'seasyenoughformachinestoeditacollectionofindividualimages图象butmemoriesaremadeupofabankofintertwined相互交织的imagesandexperiencesandcannotbechangedinthesameway. Researchershaveusedmathematicstoshowthatcomputerscannothandlethecomplexprocessesneededtofitpiecesofinformationtogetherperfectly. Thereforeifconsciousnessisbasedontheintegrationoflotsofpiecesofinformationcomputerscan'tbeconsciousandcan'texperienceemotionslikehumans. ProfessorPhilMaguireoftheNationalUniversityofIrelandinMaynoothsaysthatconsciousnesscannotbecreatedinaphysicalmachineinlimitedtimeusinglimitedmemory. Itdoesn'tnecessarilymeanthatthereissomemagicgoingoninthebrainthatinvolvessomeforcesthatcan'tbeexplainedphysically.Itisjustsocomplexthatit'sbeyondourabilitiestochangeithesaid. Hisresearchmaymeanthatlonelyhumanswillnotfindlovewitharobottheyareunlikelytobemadetheirslaveseither. 1Whydoexpertsthinkemotionalmachineswon'texist? A.Machinescan'tsolveproblems. B.Machinescan'tintegrateinformation. C.Machinescan'thandleinformation. D.Machinescan'tcommunicatewithpeople. 2TheexamplementionedinParagraph6isusedtoshow. A.machinescannotfeel B.thebrainhasconsciousness C.machinescanrecognizeshapesandcolors D.thebraincancontextualizeinformation 3Itcanbelearnedfromthetextthat. A.theideaofrobotloverswon'tcometrue B.machinescaneditintertwinedimages C.robotscanfitpiecesofinformationtogetherperfectly D.computerscanexperienceemotionslikehumansoneday 4Whatwouldbethebesttitleforthetext? A.Howrobotswork B.Robotswillneverhavefeelings C.Willrobotsbecomepeople'sfriends? D.Whatwillrobotsbelikeinthefuture?
Whenadisasterstrikeshumanitarianagencies人道主义机构likeTheWorldFoodProgrammeWFPneedinformationmorethananythingelse.Theyneedaclearpictureofthedamagetoroadsandbridgesforexampletobeabletotakequickaction. WFPhaspublishedapictureofdamagetotheepicenter震中oftheearthquakewhichstruckHaiti.Thepicturewhichhasbeenproducedintheformofasatellite﹣basedmapshowsgreatdamagetotheepicenterwhere90%ofthebuildingsweredestroyed.Inthemaponepixel像素standsforhalfameterofland.That'saverycloselookofhowthingsareontheground.Ithelpedrescueteamsalot. WFP'sEmergencyPreparednessandResponseBranchproducedaseriesofclearmapsshowingthedamageofHaiti.ThemapshavebeenproducedinpartnershipwitharesearchanddevelopmentinstitutecalledInformationTechnologyforHumanitarianAssistanceCooperationandActionITHACA.TheorganizationwassetupyearsagoespeciallytoworkwithWFPinbringingdevelopmentsofsatellitetechnologyintoitsresponsetodisasters.Justafewyearsagothiswouldhavemeanthavingtowaitforhelicopterstooverflyareasandforhumanbeingstophysicallyseethedamage.Thesatelliteswhichoperatearoundhighaboveourheadsareofgreathelp.Theyareabletoseethroughcloudswhichishelpfulwhenweatherconditionspreventtheuseofopticalinstruments光学仪器. NowbothWFPandITHACAhaveteamsworkingaroundtheclocktomakeuseofmorenewtechnologiestohelppeopleactivelydealwithnaturaldisasters.Deathsandinjuriesfromnaturaldisasterscanbereducedifthedisastercanbepredicted.Severaldisasterpredictiontechnologieshavebeendevelopedovertheyears.WearealsoworkinghardtoprovideamoreeffectiveinstrumenttopredictnaturaldisasterssaidRiccardoRoscellipresidentofITHACA. 1AccordingtoParagraph1whatdoesWFPextremelyneedafteradisaster? A.Doctorsandvolunteers. B.Medicalandfoodsupplies. C.Theinformationaboutthedamage. D.Thedetailsaboutthecausesofthedisaster. 2WhatdoestheauthormainlywanttoshowuswhenhementionstheHaitianearthquakeinParagraph2? A.Thesatellite﹣basedmapisuseful. B.Itwasaveryseriousearthquake. C.Itcausedmanyinjuriesanddeaths. D.Thepictureofthedamageisunclear. 3Whatistheuniqueadvantageofthesatellitescomparedwithopticalinstruments? A.Theycanbeusedasthesubstitutionofhelicopters. B.Theycanreducedeathsandinjuriesfromnaturaldisasters. C.Theycanbeoperatedaroundhighaboveourheads. D.Theycanseethroughcloudsinbadweatherconditions. 4WhatcanwelearnfromRiccardoRoscelli'swordsinthelastparagraph? A.Itisnoteasyforpeopletopredictnaturaldisasters. B.Naturaldisasterscancausemoreterribleconsequences. C.Theyaretryingtofindoutabetterdisasterpredictioninstrument. D.Theyhavestudieddisasterpredictiontechnologiesforyears.
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在直角坐标系xOy中抛物线Cy2=4x的焦点为F准线为lP为C上一点PQ垂直l于点QMN分别为PQPF的中点直线MN与x轴交于点R若∠NFR=60°则NR=
已知函数fx=lnx+x2+3ax+1. 1讨论函数fx的单调性 2当a<﹣1时讨论函数fx的零点个数.
ATennesseewomancelebratedherbirthdaywithabittersweetgiftfrombeyondthegrave﹣﹣flowersfromherfatherwhodiedfiveyearsago. MichaelWilliamSellerspre﹣paidforabouquetof1tobedeliveredtohisdaughterBaileyevery2untilsheturned21.AndonFridayBailey3thegiftherlastfromherdad. Mydad4whenIwas16fromcancerandbeforehediedhepre﹣paidflowerssoIcouldreceivethemeveryyearonmybirthdaytheshe.Thisismy21stbirthdayflowersandthe5. Baileysaidthespecialgiftmadebirthdays6.SincethatdayI'vehatedmybirthday7healwaysmadeitsospecialBaileysaidIwasespecially8my21stbecauseIknewitwouldbethelastyear. Baileysaidthisyear'sgiftandbirthdaycardwereespecially9.Ibrokedownshesaid.Thatletterwasvery10andsadallatthesametime. Thisismylastlovelettertoherfather11.Idonotwantyoutodropanother12formeforIamina13place.Healsotoldhertoalwaysrespecthermotherandstay14toherself.Behappyandlivelifetothefullesthewrote.Iwillbewithforeverjust15andIwillbe. Thatwasmydadshesaid.Hewastryingtomakemybirthday16. Socialmediausers17thepostcallingitbothheartwarmingandheartbreaking. Otherspraisedherfathercallinghimaan18ofwhatagoodmanislike Hewouldbevery19Baileysaidhe'dbeveryproudthatit20alotofpeople. 1A.flowers B.cakes C.presents D.grapes 2A.wedding B.birthday C.funeral D.exam 3A.sold B.cheated C.received D.threw 4A.passeddown B.passedout C.passedby D.passedaway 5A.first B.last C.best D.most 6A.tough B.happy C.natural D.honest 7A.because B.but C.so D.if 8A.liking B.expecting C.hating D.preparing 9A.expensive B.careful C.beautiful D.meaningful 10A.difficult B.sweet C.fortunate D.selfish 11A.smiled B.forgot C.wrote D.sighed 12A.coin B.hair C.tear D.leaf 13A.better B.hotter C.colder D.worse 14A.hard B.wealthy C.foolish D.true 15A.walkaround B.putforward C.lookaround D.giveup 16A.tiring B.amazing C.boring D.embarrassing 17A.respondedto B.ledto C.contributedto D.cameto 18A.joke B.story C.prize D.example 19Avivid B.proud C.nervous D.ashamed 20A.knocked B.fired C.informed D.touched
Helpfultipsforcollege﹣boundseniors Researchingacollegeisoneofthemosttime﹣consumingtasksthatyou'llencounter.1Forexamplewhatclassesandfacilitiesthecollegehastoofferandwhatsportsitoffers.Afternarrowingyourchoicestoagroupofcollegesyou'llhavetostarttoresearchtheseindepth.2Heorshemaybeabletohelpyoufindthingsaboutthecollegesthatyoucouldnotgetyourself. Knowingwhatyouwanttostudyisanotherkeytolookingforacollege.3ByknowingwhatIwanttodoIcanthenlookatcollegesthatI'vebeenthinkingaboutapplyingtoandnarrowmychoicesdown.Ifacollegedoesn'thavethecoursesIneedthenit'sdefinitelyoutofthepicture. Anotherkeythingtolookforisthecollege'stestingrequirements.4SomecollegesalsorequireanSATIItestincertainareasforexampleEnglishorMath.Remembertolookatacollege'sGPArequirementstoo.Youmayfindacollegewherethere'severythingyouwantbutyourGPAisn'thighenoughtobeconsidered.Inthiscaseyoumayneedtoattendajuniorcollegeforoneortwoyears. 5Atthispointyoumaywanttohavealongdiscussionwithyourparentsandfindouthowmuchthey'rewillingandabletospendoncollege.Ifitisn'tenoughtocoveryourfulltuitionthenyoumaywanttoapplyforfinancialaidorascholarship.Andyourfinaloptionmaybelookingforacollegethatdoesn'tcostasmuch. A.AllcollegesrequireanSAToranACTtest. B.Andlastlybutdefinitelynottheleastistuition. C.Lookforacollegenowifyouplanonattendingone. D.Youneedtofindoutmanybasicsaboutpossiblecolleges. E.Ifyouwillbeaseniorinthenearfuturethisarticleisforyou. F.Iplantomajorinbusinessmanagementandminorincomputerapplications. G.Ifyouhaveacollegecounseloratyourschoolthiswouldbeagoodtimetoaskforadvice.
函数的部分图象大致为
已知函数fx=2sinωx+φ﹣1ω>0|φ|<π的一个零点是是y=fx的图象的一条对称轴则ω取最小值时fx的单调增区间是
ItwasdaysorevenweekssinceIhadbeenleftontheisland.MyonlycompanionwasadogcalledPhillywhichhadsurvivedtheshipwreck.Memoriesofwhathappenedwerestillfresh. Themagnificenceoftheshiphadgivenusallafalsesenseofsecurity.Asthefirstsignsofthestormstartedourcaptainannouncedit'snothingmuchjustanotherstorm.Yethewaswrong!Thestormhittheshipsobadlythatlargeholesweremadeatthesidesoftheship.Asthefreezingwaterstartedrushinginourshipwasconsumedquicklybythedarkwater. MytrainofthoughtwasdisturbedbyPhillylickingmyhanddearly.Areyouhungry?Ispokemyfirstwordseversincetheshipwreckoccurred.Woofwoof!BarkedPhillyenthusiastically.Atthismomentmystomachgavealoudgrowltoo.Icouldnotrememberwhenmylastmealwasprobablyaten﹣coursedinnerontheship.AsIhadneverfishedbeforeIthoughtmaybeIcouldtrysomethingsimplerlikepickingfruits.WithPhillyatmysidearmedwithasharpbranchwewalkedintotheforestontheislandtogether.SuddenlyIthoughtIheardnoises.Couldtherebeanyoneelseonthisisland?Iwondered.Aswewerelookingforfruittreeswechancedupononethatboreyellowjuicy﹣lookingfruit.Phillystartedbarking﹣wehadcompany.Itwasadark﹣skinnedwomanholdingasharpspeardressedinfurandgrass.Ibackedawayfromherafraidthatshewouldbeaggressive.ThenIsawthatshewastryingtosaveus.Pointingherspearatthefruittreesheshookherheadstrongly. InoddedathertoshowIunderstoodwhatshewassaying.SignalingtoustofollowhersheturnedtowalkalongasmallpaththatIhadnevernoticed.Attheendofthesmallpaththerewasasmallvillage.Tearsofjoyfilledmyeyes. 1Whathappenedtotheshipthewriterhadbeenon? A.Itwasfrozeninthesea. B.Itwasturnedoverbythestorm. C.Itwasdesertedbecauseitwasinsecure. D.Itsankduetothedamagecausedbythestorm. 2AccordingtothepassagewhichofthefollowingcanbestdescribePhilly? A.Activeandfriendly. B.Caringbutaggressive. C.Smartandfaithful. D.Noisybutenthusiastic. 3Whydidthewriterwalkintotheforest? A.Totakeshelterfromthestorm. B.Togotoasmallvillage. C.Tofindsomeoneforhelp. D.Tolookforsomethingtoeat. 4Thewomanmostprobablytriedtotellthewriterthat. A.thefruittreewasn'tthebestchoice B.thefruitwasunfitforeating C.thewriterwasn'tallowedtopickthefruit D.shewasn'tafraidofthewriter
Screamifyouwanttochargeyourphone.ThankstothewondersofscienceridersonThorpePark'snewattractionarollercoaster过山车calledTheWalkingDeadcannowpowertheirsmartphonesbyscreamingloudly.That'sbecausetherearedevicesonitthat'harvestkineticenergy'动能.Theparkconductedresearchwhichshowsthatmillennials'biggestfearistheirphonesrunningoutofbatterysothedeviceshouldprovepopular.AlloftheWalkingDead'scarriageshavebeenfittedwiththeharvestingdeviceswhichnotonlyharvesttheenergyofscreamsbutthatfromg﹣forceandvibrations振动too.Theunitsarethenremovedfromthecarriagesbystaffanddepositedintoanon﹣sitemobilechargingpoint.ThorpeParksaid'Ifthrill﹣seekersarebraveenoughtoopentheireyestheywillseeasetofLEDlightsinbloodredpoweringupasguests'screamsbecomelouderthroughoutthespine﹣tingling90﹣secondexperience.'DesignedandinstalledbyresearchersatQueenMaryUniversityLondonandtheengineeringteamatThorpeParkResortthetechnologytookthreemonthstoimplement执行fromdesigntoinstallation.Itwillbeavailableatthethemeparkforaninitialtrialperiod.Ifthisprovessuccessfulthetechnologymaybecomeapermanentfixturefortheremainderofthe2018season.ThorpeParkResort'sJohnBurtonwhocameupwiththerideconceptsaid'TheWalkingDeadTheRideis15outof10onthescarefactorscale等级soitmakessensetobeabletocombineandusethepowerofourvisitors'screamsandtheride'svibrationstohelpsolveaproblemeachandeveryoneofusfaces﹣losingthechargeonourmobileswhenwe'reonadayout.'DrJoeBriscoeSchoolofEngineeringandMaterialsScienceatQueenMaryUniversityofLondonsaid'Thisisanexcitingconceptthatwillundoubtedlybeusedmorefrequentlyinthefuture.Thesystemusesaminienergyharvestertocapturethekineticenergytransferringittoaseparateelectricalcircuitandstorageunitwhichisenoughtochargeamobilephone.'1Wecanlearnfromthetextthat.A.aphoneshouldbeputintherollercoastertobechargedB.itwasJohnBurtonwhodesignedandinstalledthedeviceC.theenergyofscreamsg﹣forceandvibrationscanbeharvestedbythedeviceD.thetrialperiodofthetechnologywilllastthreemonths2Whatdoestheunderlinedword'spine﹣tingling'meaninParagraph4?A.Unforgettableandsatisfying.B.Interestingandinspiring.C.Exhaustingbutdelightful.D.Frighteningbutexciting.3WhatisDrJoeBriscoe'sattitudetowardthefutureofthenewconcept?A.Skeptical.B.Optimistic.C.Critical.D.Neutral.4What'sthemainideaofthetext?A.Thetraditionalwayofchargingyourphoneisonthewayout.B.Anewbatteryforpoweringyourphoneisinvented.C.Visitors'screaminThorpeParkcanbeusedtochargethephone.D.ThemosteffectivewayofchargingyourphonehasbeenfoundinThorpePark.
随着人民生活水平的日益提高某小区居民拥有私家车的数量与日俱增.由于该小区建成时间较早没有配套建造地下停车场小区内无序停放的车辆造成了交通的拥堵.该小区的物业公司统计了近五年小区登记在册的私家车数量累计值如124表示2016年小区登记在册的所有车辆数其余意义相同得到如下数据 1若私家车的数量y与年份编号x满足线性相关关系求y关于x的线性回归方程并预测2020年该小区的私家车数量 2小区于2018年底完成了基础设施改造划设了120个停车位.为解决小区车辆乱停乱放的问题加强小区管理物业公司决定禁止无车位的车辆进入小区.由于车位有限物业公司决定在2019年度采用网络竞拍的方式将车位对业主出租租期一年竞拍方案如下 ①截至2018年已登记在册的私家车业主拥有竞拍资格 ②每车至多申请一个车位由车主在竞拍网站上提出申请并给出自己的报价 ③根据物价部门的规定竞价不得超过1200元 ④申请阶段截止后将所有申请的业主报价自高到低排列排在前120位的业主以其报价成交⑤若最后出现并列的报价则以提出申请的时间在前的业主成交.为预测本次竞拍的成交最低价物业公司随机抽取了有竞拍资格的40位业主进行竞拍意向的调查统计了他们的拟报竞价得到如下频率分布直方图 Ⅰ求所抽取的业主中有意向竞拍报价不低于1000元的人数 Ⅱ如果所有符合条件的车主均参与竞拍利用样本估计总体的思想请你据此预测至少需要报价多少元才能竞拍车位成功精确到整数. 参考公式对于一组数据x1y1x2y2…xnyn其回归直线的斜率和截距的最小二乘估计分别为.
假定英语课上英语老师要求同桌之间互相修改作文请你修改你同桌的以下作文. 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. 删除把多余的词用斜线\划掉. 增加在缺词处加一个漏字符号∧并在该词下面写出该加的词. 修改在错的词下划一横线在该词下面写出修改后的词. 注意1每处错误及修改均仅限一词. 2只允许修改10处多者从11处起不计分. Dearfriends ItisagreathonortosharewithyoumyexperienceinmakingEnglishspeeches. TotellatruthmyspokenEnglishusedtobeabigheadacheforme.DuetomyterriblepronunciationIoftengotmisunderstoodorevenlaughedbyothers.Ineversucceedinspeechcompetitions.ThereforeIrefusedtogiveup.EverydayIspenttwohourslistentoEnglishprogramstoimprovemyoralskills.Tomyjoymyeffortwasfinallypaidoff.Imadesteadilyprogressandmanagedtowinprizesinsomespeechcompetition. Soproblemscanhelpusgrowifwedealwithitbravelyandproperly.ThisiswhichI'velearnedfrommyexperience.
WhyYouShouldn'tPunishYourKidsForLyingIt'snoeasytasktostopyourchildrenlying.TherearemanyinfluencesTVmoviesvideogamesandsomegreatbooksinwhichliesarecommon.Childrenseeparentslietoothersonlytobepolite.MostparentsaddtothatwithtalesaboutthelivesandactivitiesofSantaClausortheToothFairytobringjoyortolessenfears.1butforsomechildrenlyingcanbecomeaproblem.Themostcommonreactionstochildrenwholieareexplainingwhyitiswrongandpunishingthem.2.Herearethreebettertoolssupportedbyresearchtouseinstead.PRAISEYoucouldaskyourchildtosaysomethingthathappenedatschoolthatistrue.Whenyourchildobeyspraisehimenthusiastically.Bespecific'Thatwasgreat!YoutoldmewhathappenedjustasIasked.Wow!'andgiveyourchildahugorahighfive.Aimforoneortwointeractions互动likethisaday.Ifyouhappento'catch'yourchildinaliesaysomethinglike'Thatisnottrueandcouldgetyouintroubleoutsideofthehome.'MODEL3.Thiscouldbeaboutsomethingthathappenedwhenyouwereachildorsomethingthathappenedduringtheday.Itneednotbedramatic.Anotheroptionistoplayagameatdinner.Eachpersontellsonethingthatwastruethatday.Againgivealittlepraisetothechildwhonormallyliesifheplaysalong.DECREASEPUNISHMENTANDMORALIZINGSomechildrenareunlikelytochangebehaviorordeveloptheconductyouwant.Thatdoesnotmeanyoucanignoretheirlyingorletitgo.Ratheruseverymildpunishmentlightscoldingshortlossofprivilegeabrieftime﹣out.4.Trytheseproceduresfortwotothreeweeksandseewhereyouare.Usuallyliescanbedroppedbythen.5butwiththerightencouragementcanbedramaticallylessened.A.ParentspunishchildrenbecausetheyareinapositionofgreaterpowerB.ButaswaysofchangingbehaviortheseareineffectiveC.TheythinkitunnecessaryforchildrentotellalieD.ParentsdothisoutofloveE.SeverepunishmentsarenotalwayseffectiveinactuallychangingthefrequencyoflyingF.YoushouldsetagoodexampletoyourkidsandexplicitlytellthetruthG.Itisunlikelythatlyingwillbecompletelyremoved
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