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已知数列{an}中,. (1)记bn=log2(an+1),判断{bn}是否为等差数列,并说明理由: (2)在(1)的条件下,设,求数列{cn}的前n项和Tn.
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高三下学期数学《》真题及答案
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OnThanksgivingdayMrs.Kleintoldherfirstgraderstodrawapictureofsomethingforwhichtheywerethankful.Shethoughtthatlivingina1neighborhoodmostofthesechildrenwoulddrawpicturesof2oroffullyladenThanksgivingtables.Thatwaswhattheybelievedwas3ofthem. WhattookMrs.Kleinby4wasDouglas'spicture.Douglaswassoaloneandlikelytobefound5inhershadowastheywentoutsideforplay.Douglas'sdrawingwassimplyan6obviouslybutwhose? Theclasswas7byhisimage.IthinkitmustbethehandofGodthat8usfoodsaidonestudent. A9saidanotherbecausetheygrowtheturkeys. Itlooksmorelikeapolicemanandthey10us. IthinksaidLaviniawhowasalwaysso11thatitissupposedtobeallthehandsthat12usbutDouglascouldonlydrawoneofthem. Mrs.Kleinhadalmost13Douglasinherpleasureatfindingtheclasssoactive.Whenshe14theothersatworkonanotherprojectshe15andaskedDouglaswhosehanditwas. Douglas16It'syoursteacher. ThenMrs.Klein17thatshehadtakenDouglasbythehandfromtimetotimeshe18didthatwiththechildren.Butitshouldhave19somuchtoDouglas! PerhapsshereflectedthiswasherThanksgivingandeverybody'sThanksgiving-notthematerialthings20tousbutthesmallwaysthatwegivesomethingtoothers. 1A.wealthy B.friendly C.poor D.crowded 2A.friends B.turkeys C.clothes D.flowers 3A.asked B.given C.informed D.expected 4A.surprise B.excitement C.accident D.relief 5A.left B.sad C.close D.shut 6A.hand B.image C.face D.finger 7A.amused B.puzzled C.shocked D.moved 8A.lends B.donates C.cooks D.brings 9A.servant B.mother C.waiter D.farmer 10A.guide B.teach C.protect D.arrest 11A.naughty B.serious C.curious D.stupid 12A.help B.love C.shelter D.lead 13A.praised B.kissed C.thanked D.forgotten 14A.had B.took C.changed D.stopped 15A.stoodup B.wentover C.turnedover D.lookedup 16A.lied B.burstin C.whispered D.criedout 17A.recognized B.wondered C.imagined D.recalled 18A.often B.never C.seldom D.sometimes 19A.remained B.meant C.cost D.came 20A.shown B.opened C.given D.said
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JohnGeorge60remembersthathelivedawonderfullifeintheDetroitneighborhoodwherehegrewup.Weknewallourneighbors.GeorgetoldDetroit'sMetroTimes.OnChristmasEvewe'dallgotomidnightMassandthere'dbe300peopleinourhouseatoneo'clocktoaboutfiveinthemorning.Thefolkswerejustreallygoodhandworkingpeople. Bythe'80sHowever.theoldneighborhoodchanged.Dueinparttoeconomicdownturnsanddrugabusewell-kepthomeshadbeenabandonedandkindlyneighborshadfledtothesuburbs郊区.ButnotCeorgeLivinginanycityit'slikebeinginarelationshiphetoldReader'sDigest.Somedaysarebetterthanodiers.ButitwasmyHome.AndwhenIsawitbecomingworseIhadtwochoicesIcouldleaveorIcouldstayandfight.Ichosethelatter. Whentheabandonedhomebehindhisturnedintoaworn-outplacethefatheroftwograbbedsomeboardsandnailsandbeganboardingupthehouse.Aftertwoneighborsstoppedtoaskwhathewasdoingtheydecidedtohelpwithgreatresults. That'showitallgotstarted.Inthe30yearssincethatfirsthomerescueanarmyofapproximately182000volunteersalongwithprivatedonorshashelpedGeorgepulldownaround300abandonedhomesmainlyindiepoorerNorthwestareaofDelruit.They'vealsosecured400-somehomesbyboardingthemup.They'vepaintedandrepairednearly900homesandbuiltover100fromscatch.AccordingtoForbesmorethan1000Detroitershavebeenhousedasaresultoftheirwork. Andthere'sHalloween.InDetroitOctober30wasknownasDevil'sNightaperiodwhenallhellbreaklooseintheformofcrimeandvandalism破坏公物.InresponseGeorgecreatedacitizens'patrol巡逻thatwouldtaketothestreetskeepinganeyeonillegalbehavior.HenameditAngels'NightWhatbeganwith12neighborsonpatrolin1990hasgrowntomorethan60000citywide. George'sinspiredideashavenotgoneunnoticedbythecityheloves.Othersarebuyingintoit.There'satrendofyoungerhomeownerscomingin. 1WhatwasGeorge'shomecityDetroitlikebeforethe'80s? A.Neighborswereniceandgotalongverywell. B.Peopleinthesuburbsledawonderfullife. C.Economydeclinedbecauseofdrugabuse. D.Manyhomeswereabandonedandpeoplelied. 2WhatdidGeorgedecidctodoafterhisneighborhoodchanged? A.Movotothesuburbs. B.Meavehishomelown. C.Joinhisneighborstohelp. D.Stayandfighttosavehiscity. 3WhathappEnodasareultofGeorgeandothervolunlcere'hardwork? A.MorepeoplemovedintoDetroit. B.AlmostallDetroiterswerehoused. C.Over100homeswerenewlybuilt. D.Therewasnoillegalbehavioranymore. 4Whatdoesthestorymainlyintendtotollus? A.Greatmindsthinkalike. B.Twoheadsarebetterthanone. C.Afriendinneedisafriendindeed. D.Littlepeoplecanmakeabigdifference.
NatalieTraylingisafamousstreetartistinMelbourne.Atfirstthosewhohappenedtopassbyherandsparesomechangedidn'tevenrealizewhatamusicalgeniuswasplaying.TheemotionaltunewasnotonlymasterfullyplayedbutalsocomposedbyNatalieherselfwhenshewasonly14.Graduallyaslongassheappearspeoplewillstopabsorbedinhermusic.Hermusicmakesyouthinkaboutcalmnessthegoodthingsinlifeandnevergivingup. Butwhatpeopledonotknowisthatbehindthebeautifulmusicoftheoldwomanitisfullofbitterness.Attheageof12shewonamusicscholarshipatSantaMariaCollege.At15sheknockedbackascholarshiptotheRoyalAcademyofMusicinLondonbecauseherparentscouldn'tpaynon-tuitioncosts.WhensheleftschoolshetaughtpianoatSantaMaria.LatershemetherhusbandDenis.Theyhadfourchildrenbutthetwoofthemdied.In1984Denisaskedforadivorce.Natalie'ssonNathanwasgivenmedicationfordepression.NatalielivedeitheroutdoorsinRoyalParkorinboardinghousesfornineyears.Inlate2003Nataliecollapsedwithanaemia贫血andwashospitalizedforsixmonths. ForhalfacenturyNataliehasbeenteasedbyfate.Butevensoshenevergaveupherloveformusic.WhenaskedwhythemusicwassoimportanttohershesaidMusiciseverything.Idofeelpartofit.Thewholeworldismusic. WhenNataliewentontheInternetshebecameasignofMelbourne.Peopleareimpressedbyherpersistenceindreamsandtheoptimismoflife.Nowsheisnolongerwanderingaround.ShecanplaythepianoatanytimebutaslongastheweatherisgoodshewillwalktothestreetsofMelbourneandplayatouchingmelodyfortherushofthecity. 1WhyisNatalie'smusicsotouchingtothepassers-by? A.Itisfullofbitterness. B.Shecomposeditherself. C.It'sareflectionofherownlife. D.Itremindsofthebeautyoflife. 2WhichofthefollowingcanreplacetheunderlinedwordknockedbackinParagraph2? A.gaveup B.obtained C.accepted D.wasawarded 3WhatdoesmusicmeantoNatalie? A.It'shertalent. B.It'sthesourceofhermisfortune. C.Itispartofherlife. D.It'sawaytoearnaliving. 4Whatdoestheauthortrytotellus? A.Natalieisamusicalgenius. B.Lifeisnoteasyforeveryone. C.Nevergiveuphalfway. D.Nataliehasastrongandbraveheart.
TiredofWorkinginYourCountry? Withover500instructorsand20yearsofexperiencewearetheleaderinthefieldofteachingforeignlanguages.WenowhavepositionsopeninOsakastartingSeptember/October2018forinstructionsofEnglishGermanSpanishandFrench. ●Teachmanydifferentkindsofclassesusingthelatesttechnologyinsmallclassesofupto30students. ●Accommodationandothernecessarydocumentswillbereadybeforeyouleave. ●Applicantswillteachtheirfirstlanguageonly. ●Excellentteachertrainingprograms. Ifyouareyoungwithauniversitydegreeandarewillingtoexperiencedifferentculturesapplynow.Experienceinteachingisanadvantagebutnotspeciallyrequired.KnowledgeoftheJapaneselanguageisnotnecessarybutgoodEnglishskillsandpracticalcomputerknowledgearebasicrequirements. ApplywithC.V.andsendlettertoNOVAFranceMr.SampyIHT3/2 34Bd.Haussmann75009ParisFrance Fax33148014804 Orvisitourwebsitewww.teachjp.com ThemanagerexpectstomeetandtalkwithsuccessfulapplicantsinParisinJuneandJuly. 1Whatisthepurposeofthetext? A.TointroducealanguageschoolinJapan. B.TodescribeworkingconditionsinJapan. C.TomakecleartherequirementsforJapaneseteachers. D.TohirelanguageteacherstoworkinJapan. 2WeknowfromthetextthatthosewhoaregoingtoJapanwill. A.gettrainedforthejob B.receiveadegreefromauniversity C.havefreeaccommodation D.teachEnglishonlyinOsaka 3BeforegoingtoJapanyouneed. A.toseethemanagerofNOVAFrance B.totakesomecomputercourses C.towritealettertoJapan D.tofindaplacetolive 4IfyouwanttoworkinJapanyoushould. A.havesomeworkingexperience B.knowhowtousecomputers C.presentgoodteachingplans D.speakseverallanguages
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限一词 2.只允许修改10处多者从第11处起不计分. WehadanEnglishstory-tellingcompetitiondaybeforeyesterday.ItisrequiredthatalltheentriesbeoriginalandinterestingandbepresentinginEnglishwithinfiveminutes.Allmyclassmatestookanactivelypartintheactivity.TwoforeignEnglishteacherswereinvitedtoactlikejudges.IntheendLiPinghadgotthefirstplace.Alltheparticipantssaidtheactivitybenefitedusalotinmanyways.NotonlydiditimprovedtheirspokenEnglishanditalsobroughtthemmuchfun.Weallhopethatsuchkindsofactivitycanbeheldagain.
假设你是李华.你的英国朋友Emily来信说她非常喜欢中国的民族舞并打算最近来中国学习民族舞想请你帮她推荐一位舞蹈老师.请你根据以下要点给她写一封信推荐一位老师. 要点 1.介绍你所推荐的老师 2.推荐该老师的原因 3.祝愿她拜师成功. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. DearEmily Yours LiHua
Itisnotassimpleasopeningthedoorandhittingthetrackinwinter.Thereareafewthingsyoucandotoensureyouaregettingthemostoutofyourrunandimporantlynotdoingmoreharmthangood. Warmupcooldown 1Yourmusclesneedsometimetowarmupwhenit'scoldsotakeiteasywhenyousetoffanddoafewstretches伸展onceyou'refinished. Drinkwater Youmightnotfeelhotbutthat'sbecausesweatevaporates蒸发morequicklyintothechillydryair.Sobesuretodrinkwaterbeforeduringandaftercold-weatherworkouts.2Abeltbottleconvenientlyattachestoyourwaistsoyoudon'thavetocarryitandcanhaveadrinkwheneveryoufeellikeit. 3Runningincottonisabadidea.Wearthinbreathablelayersofsynthetic合成的clothingthathelpprotectyoufromthewindandsnowbutstillletoutheatandmoisture水分.Thirtypercentofyourbodyheatescapesthroughyourhandsandfortypercentthroughyourhead.Wearahatorbeanie无边小便帽andglovessoyourcirculatorysystemcandistributewarmbloodtotherestofyourbody.4 Runintothewind 5ObviouslyitwillbeaneasierpassagehomewithsomeextrahelpfromMotherNature.Butmoreimportantlyyouwon'thavethewindinyourfaceforthesecondhalfofyourrunwhenyouaremorelikelytobesweatingandcatchachill. A.Dressright. B.Keepwarm. C.Don'tgotoofasttoosoon. D.Startandfinishinthesameway. E.Don'twaittodrinkwateruntilyoufeelthirsty. F.Headoutintothewindandcomehomewithitatyourback. G.Onreallycolddayswearamaskorscarfoveryourmouthtoprotectyourface.
将函数fx=sin2x的图象向右平移个单位长度得到gx图象则函数的解析式是
RedisaparticularlypopularcolorinChina.Apairofredshoes-1theyareforsportsdancesorjustfashion-isamust-haveforeveryChinesewoman'sshoecollection.FormostChinesebridesredshoesshouldalsobeworn2theirbigday. Aswomen'sfeet3connectwithfemaleattractionredshoesoftenemphasizethisaspect4conveyaspecialbeauty.InsomeclassicChinesenovelsthereare5describeofcharmingwomeninredsilkshoes. Ifyouwearadarkdressincold6seasonapairofredshoescanraiseyourensemble整套服装toa7highlevel.Theycanalsogowithdifferentlevelsofredcolor8givetheweareralivelyandjoyfullook. 9sureredwillalwaysbeabelovedcolorfordesignersandredshoeshavealsobecomeachoiceformanysupermodels.Ifyouarealsoafanofthis10energycolorconsiderwearingapairofredshoesforeveryChineseLunarNewYear!
Whenwereadapoem.weoftenimaginewhatthepoets1thinkwhentheywroteorwhattheyweredoingatthetime.Thesethoughtsletusconnectwiththewordsbetterasifwe'dcreatedthepoem2we.Willapoemstillmeanasmuchifacomputewritesit? By3useagorithms算法computerscannowcreateallkindsoftextincludingresearchpapersbooksnewsstoriesandevenpoems.Computer-generatedpoemsmightbecorrectinbothgrammarandstyle4somesaytheystilllack5createandtruemeaning. AustralianresearcherOscarSchwartzcreatedawebsite6callbotornot.Onhissiteyoucanreadpoemsandguesswhetherthey7writebyahumanoracomputer.SchwartzrecentlygaveaspeechatTedXSydneyin8hestatedthatsomeofthewebsite'spoemswereableto9foolish65percentofhumanreaders. Hesaidthatonhiswebsitehehopedpeoplewouldquestionthedifferencebetweenhumansand machines一andbeabletoidentifywhatitis10makesushuman.
Theyear2019willmarkthe100thanniversaryofthedeadliestinfluenzaoutbreakinhistory.Itisestimatedthattheinfluenzapandemic瘟疫of1918killedmorethan50millionpeoplearoundtheworld.Otherestimatesgomuchhigher.Becauseofalackofmedicalrecord-keepingwemayneverknowtheexactnumber. Theinfluenzawasafastkiller.Somevictimsdiedwithinhoursoftheirfirstsymptoms.Othersdiedafterafewdays.theirlungsfilledwithliquidandtheychokedtodeath.The1918flupandemicwasalsodifferentfromotheroutbreaks.Itstruckmanyyounghealthypeople.Virusesusuallyaffectsickoroldpeople. Althoughmodernmedicineeffectivelycontrolsmanydiseasesinfluenzaremainsdifficulttoprotectagainst.TheWorldHealthOrganizationestimatesthateveryyearinfluenzakills250000to500000peoplearoundtheworld.Eachyearmedicalscientistsdevelopfluvaccines疫苗whichofferimmunity免疫fromsomeinfluenzaviruses.Buttheycanonlyguesswhichformoftheviruswillspread. Healthofficialsremainconcernedaboutanotherflupandemic.Newformsofthefluvirusappearregularly.OneexamplewastheswinefluorH1N1outbreakin2009.AnthonyFauciDirectoroftheNationalInstituteofInfectiousDiseasesintheUnitedStatessaysthatviruscausedatruepandemic. Tostopthenextpandemicscientistsarenowresearchinghowtocreateauniversalinfluenzavaccine.InOctober2019VanderbiltUniversityMedicalCenterintheU.S.announcedtheUniversalInfluenzaVaccineInitiative.Theuniversitysaidresearchersareleadinganinternationalefforttodevelopauniversalinfluenzavaccinethatwillprotecteveryoneagainstallformsofthefluanywhereintheworld.Theuniversityaddedthatresearcherswillbegintestsinearly2019.theHumanVaccinesProjectapublic-privatepartnershipisfundingtheproject.Howeveruntilauniversalinfluenzavaccineisavailabletoday'sseasonalfluvaccineremainsimportant. 1Whatdoweknowabouttheinfluenzain1918? A.ItsweptacrossthewholeEurope. B.Noonesurvivedthefirstfewdays. C.Itkilledthelargestnumberofpeople. D.Itstruckonlyyoungandhealthypeople. 2Whyisinfluenzadifficulttoprotectagainst? A.Itspreadstoorapidly. B.Itisquiteeasytocatch. C.Novaccineisavailable. D.It'shardtojudgetheformofvirus. 3WhatdoestheauthorwanttotellbymentioningH1N1in2009? A.Newformsoffluviruskeepsappearing. B.Itwasthemostseriousinrecentyears. C.Itwascausedbythesamefluvirusof1918. D.TheH1N1viruswasdeadlyaswell. 4Whatcanwelearnabouttheuniversalinfluenzavaccine? A.Thedevelopmentisquitecostly. B.Itwillbeusedallovertheworld. C.Itcanprotectagainstallformsofflu. D.Itwillsooncomeintousein2019.
Twodeerjumpedoutinfrontof16-year-oldAmandaFloyd'scar.Shesteppedonthebrakestoppingthecarjustintime.Butlatershestartedtexting.Distracted分心的Amandaturnedleftandrightthencrashedintoanothercar.Luckilyshewasn'tinarealcar-shewasinadrivingsimulator模拟器atRooseveltHighSchoolOhioUS.IneverreallyrealizedthatcarsmakeaturnthatmuchAmandaaJuniorsaid.Sheaddedthatshewouldn'ttextwhiledrivinganymore. TheOhioDepartmentofTransportationODOTandStateHighwayPatrolbroughtthesimulatortotheschool.Theysaidtheywantedtohelpstudentslearnaboutthedangerofdrivingwhiledrunkwhiletextingorwhiletalkingonthephone. AccordingtotheNationalHighwayTrafficSafetyAdministrationdistracteddrivingclaimed3450livesin2016alone.Expertsbelievetheactualfigureisprobablyhigher. Thesimulatorisbasicallyacomputerprogram.Likemanycomputergamesitwasahitwiththestudents.Theylinedupandcrowdedaroundtowatcheachothertaketurns.Thesimulatorhasasteeringwheel方向盘brakeandgaspedal油门踏板.Itismadeupofthreelargecomputerscreensonatable. Studentschooseadistractionsuchasdrivingwhiledrunkortexting.Theyalwayscrashofcourse.Thentheyarepulledoverbythepolicetobetaughtthebadresultsoftheirdrivinghowmuchdamagethey'vecausedwhattheirfineisifanyonediedintheaccidentandifthey'regoingtogotoprison. ItteacheshowtodrivewithoutbeingontheroadsaidShanteThompson16.Shehadjustcrashedintoadeer. ODOTspokesmanJustinChesnicsaidhundredsofkidshavegonebehindthewheelsofar.Hesaidevenmorehavebenefitedfromwatchingtheirclassmates. Drivingissuchamajorresponsibilitysotakeitseriouslyhesaid.Putawayyourcellphone.Alotoftheaccidentsouttherearebecauseofdistracteddriving.Itcannotonlychangeyourlifebutitcanchangesomeoneelse'slifeforever.Theresultsareserious. 1WhatdoestheauthorintendtodoinParagraphOne? A.Introducethetopicofthetext. B.Illustratetheauthor'spointofview. C.Providesomeadviceforthereaders. D.Offersomebackgroundinformation. 2WhyisthedrivingsimulatorprojectintroducedtoRooseveltHighSchool? A.Itteststhestudents'abilitytostayfocused. B.Itgetsstudentstohavefunbetweenclasses. C.Itteachesstudentshowtodealwithtrafficaccidents. D.Itmakesstudentsawareofthedangersofdistracteddriving. 3Whatcanweknowaboutthedrivingsimulator? A.Itisconnectedtothelocalpolicestation. B.Itisarealcarbuthaslargecomputerscreens. C.Itattractsthestudents'interestasacomputerprogram. D.Itbenefitsthestudentswhouseitmorethanthosewhoonlywatch. 4Whatisthebesttitleofthepassage? A.TrafficrulesinOhioUS B.Dangerofdistracteddriving C.Simulateddrivingforstudents D.Advantagesofcomputergames
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