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坐标平面上的点集S满足S={（x，y）|log2（x2-x+2）=2sin4y+2cos4y，y∈[-，]，将点集S中的所有点向x轴作投影，所得投影线段的长度为（ ）
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高二下学期数学《》真题及答案
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坐标平面上的点集S.满足S={xy|log2x2﹣x+2=2sin4y+2cos4yy∈[﹣]将点集
1
2
若点P.xy的坐标xy满足xy＝0试判定点P.在坐标平面上的位置
如图在平面直角坐标系中一次函数y=kx+b的图象经过点A.﹣26且与x轴相交于点B.与正比例函数y=
点P.xy在直线x+y=8上且x＞0y＞0点A.的坐标为60设△OPA的面积为S..1求S.与x的函
设点Mxy的坐标满足不等式组点mn在点Mxy所在的平面区域内若点Nm+nm﹣n所在的平面区域的面积
设集合A＝{x|2logx2－7log2x＋3≤0}若当x∈A.时函数fx＝log2·log2的最大
函数fx＝log22x－x2的递增区间是________.
已知函数fx=log2x-2若实数mn满足fm+f2n=3则m+n的最小值是.
如图在平面直角坐标系中点Pxy是直线y＝－x＋6上第一象限的点点A.的坐标是40O.是坐标原点△PA
如图在平面直角坐标系中一次函数y＝kx＋b的图像经过点A.﹣26且与x轴相交于点B.与正比例函数y＝
函数y=log2的定义域为
{x|﹣3＜x＜2}
{x|﹣2＜x＜3}
{x|x＞3或x＜﹣2}
{x|x＜﹣3或x＞2}
若函数fx满足对于任意x1x2>0都有fx1>0fx2>0且fx1＋fx2
Shanon公式为
C=B*log2（1+S/N）
C=B*log2（1+S）
C=B*log2（S/N）
C=log2（1+S/N）
质量为m=2kg的物体在光滑的水平面上运动在水平面上建立x0y坐标系t=0时物体位于坐标系的原点0物
已知点A.40及在第一象限的动点P.xy且x+y=50为坐标原点设△OPA的面积为S..1求S.关于
点P.xy在直线x+y=8上且x＞0y＞0点A.的坐标为60设△OPA的面积为S..1求S.与x的函
下列函数中既是偶函数又在区间12内是增函数的为
y=cos 2x,x∈R.
y=log2|x|,x∈R.且x≠0
y=
,x∈R.
y=x3+1,x∈R.
直线y＝x＋2与x轴y轴分别交于A.B.两点D.是x轴上一点坐标为x0△ABD的面积为S..1求点A
在平面直角坐标系XOY中点集K={xy||x|+2|y|﹣42|x|+|y|﹣4≤0}所对应的平面区
求函数y＝log2x2－6x＋5的定义域值域和单调区间.
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OneofthemostpopularAmericansingersofthetwentiethcenturywasElvisPresley.Hemadetherock'n'rollmusicpopularallovertheworld.Hesoldmillionsofrecordsandmademanysuccessfulfilmsandhehelpedchangethedirectionofpopularmusicinthe1960s. ElvisPresleywasborninapoorfamilyin1935.Hisparentsweresimplecountrypeoplewhooftentookhimtochurchwherehelearnedtosingandheneverforgotthekindofsongsthatheusedtosinginchurchasachild. WhenhewasyoungElvismovedfromToledotoMemphisinTennesseewhereheattendedhighschoolbuthewasnotagoodstudent.Hisonlyrealinterestwassinging.Hebegantosinginthestylethatiscalledcountryandwestern. In1995herecordedsomesongsforhismother'sbirthday.Thepeopleattherecordingstudiolikedhissingingandhismusic.ItwascountryandwesternmusicbutitalsosoundedalittlelikethemusicwhichblackpeopleusedtosingintheAmericanSouth.ItwascalledBlues. ShortlyafterthatElvismetTomParkerwhobecamehismanagerandarranged安排concertforhimacrosstheUnitedStatesandnewrecordingaswell.SoonElvisbecamefamousaroundthecountry.LaterElviswenttoHollywoodandbegantoappearinfilmssuchasLoveMeTenderandKingCreole. ButElvisfounditdifficulttolivewithsuccess.Likemanyotherfamouspeoplehebegantotakedrugsandhishealthstartedtosuffer.Whenhediedatanearlyageof42in1977millionsofhisfanswereshockedTheKingIsDead!thenewspapersaid.ButtodayhismemoryandhismusicliveonandhewillalwaysberememberedastheKingofRock'n'Roll. 1WhowasTomParkerinthetext? A.Anotherfamoussinger. B.Elvis'manager. C.Amanagerofabigbank. D.Elvis'bestfriendsincechildhood. 2WhatcausedElvis'death? A.Thepressurefromhisparents. B.TomParker'spunishment. C.Histakingdrugs. D.Hissingingtoomucheveryday. 3Whatcanwelearnfromthetext? A.Elvisdidn'tgetanyhelpfromhisparents. B.Elvisforgothischurchmusicatalaterage. C.ThechurchsongshelpedElvisdevelophissinging. D.ThechurchsongsstoppedElvisfromdevelopinghisownstyle.
已知a＞0若关于x的不等式x﹣12＞ax2的解集中的整数恰有3个则实数a的取值范围是
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Anyexerciseisgoodexercisebutwhenitcomestolosingweightit'shardtobeatrunning.Afterallrunningisoneofthemostefficientwaystoburncaloriesandgetfitwithouthavingtorestrictyourdiet.1Ifyou'renotarunneryetbutinterestedinlosingweightherearefourreasonsrunningcanbethebestexerciseforweightloss. 2Whencomparingrunningwithwalkingthesamedistancestudiesfindthatrunningwillleadtogreaterweightlossmostlikelybecauseyourrestingenergyexpenditurestayselevated高的afteryourun.Inalong﹣termcomparisonstudyofrunnersandwalkerscaloriesburnedthroughrunningledto90%moreweightlossthancaloriesburnedthroughwalking. Runningistime﹣efficient.Evenifthemyththatrunningamileandwalkingamileburnthesamenumberofcaloriesweretruerunningisaconsiderablyfasterwaytoburnthosecalories.3 Runningisconvenient.Thoughmanyofushaveaccumulatedavastarsenal武器装备ofGPSgadgetsandtechteesovertheyearslittleisactuallyrequiredtogorunning.Youcandoitalone.Youcandoitalmostanywhere.4Forthisreasonalonerunningisthebestworkoutforweightlossbecauseit'scheapandaccessibleandtherearefewerbarrierstomaintainingaroutineevenwhiletraveling. Twowordsrunner'shigh.5Fortunatelystudiessupportwhatmanyrunnershaveexperiencedonananecdotallevel﹣runningcanactuallygetyouhigh.Scientistshavefoundlinksbetweenmoderatetointenseexerciseandmorphine﹣likebrainchemicalswhichexplainstheoccasionalfloodofthrillthatrushesoveryouduringahardrun.Thathappysensationyouhadafteryourlastracemakesyouwanttogoforanotherrunright? A.Cultivatethegoodhabitofrunning. B.Runningworksevenwhenyou'reatrest. C.Youwillneversticktoahabitifyoudon'tlikeit. D.Thefirstruleofexercisingforweightlossisthatifyoudon'tenjoyityouwon'tstickwithit. E.Youdon'tneedanyequipmentbeyondapairofrunningshoes. F.Ifyou'realreadyarunnerkeepon. G.Mostpeoplecanruntwoorthreetimesasfarastheycanwalkinagivenamountoftime.
假定你是李华你的外教老师Jack对中国传统文化很感兴趣想了解即将到来的中国的中秋节.请你写信向他介绍这个节日.内容包括 1.收到邮件的心情 2.简单介绍该节日 3.邀请他一起过节. 注意 1.词数80左右 2.可适当增加细节以使行文连贯.
Billisagpersonwhohasgivenmillionsofdollarstohelpthosepeopleinthedisaster﹣hitarea.
Placestoavoidtravelling IndiaThebigdifferenceinwealthandclassmayleadtosomeoftheriskofcrimesinthiscountry.ButaccordingtoJohnGobbelsachiefofficerforMEDJETaninternationalemergencyorganizationit'smedicalsafetythatactuallymakesIndiasodangerous.HeexplainsthattheU.S.StateDepartmentgivesthecountryLevel2traveladvisorystatusLevel1meansyoushouldexercisenormalprecautions预防措施Level4isdonotgo HawaiiConsideringthisdestinationisaveryhotspotforhoneymoonersitmightbesurprisingtoseetheBigIslandofHawaiiasadangerousplacetovisit.TheeruptionofavolcanohasputKilaueainastateofemergencywithpoisonousgaslavaflowsandearthquakesallarisk.You'lllikelyseespecialairlinedealscancelledsothinktwicebeforemakingthisflight. AcapulcoThisbeachresorttownonMexico'sPacificcoastisn'texactlythewhite﹣sandpartydestinationitoncewas.WithaLevel4traveladvisoryGobbelsexplainsit'sinthesamecategoryasplaceslikeIranSyriaandNorthKoreaIt'sregardedasthemurdercapitalofthecountry. CairoEgyptAccordingtoarecentreportfromtheThomsonReutersFoundationCairoisconsideredthemostunsafecityforwomenintheworld.EventhoughthepoliticaltensionsareeasinginthisareaaccordingtoGobbelssexualviolenceandculturalexpectationsmakeitextremelyproblematicforbothlocalsandvisitors. 1AccordingtoJohnGobbelswhichisdangerouswhiletravellinginIndia? A.Personalbelongings B.Travelinsurance. C.Medicalsafety. D.Culturaldifference. 2Whichplacementionedaboveisespeciallydangerousforawomantourist? A.Cairo. B.India. C.Acapulco. D.Hawaii 3Whatcanbeinferredfromthetext? A.ALevel3traveladvisoryindicatesyoucangowithnormalprecautions B.Syriaisn'tariskydestinationwhereyou'llhaveawonderfulvacation. C.TheflightstoHawaiimaybechangeableduetotheeruptionofthevolcano D.ThepoliticaldisorderinCairoisresponsibleforitsunsafetyatpresent.
When1learntodrivewearetoldtoobeythetrafficrulesandnottodriveourvehiclestoofast.2surprisesusisthatsomeyoungpeoplejustenjoythefeelingofdrivingcarsormotorcyclesataveryhighspeed.Jack318﹣year﹣oldboyis4exception. RecentlyJack'sfatherhasboughthimacar5isquiteadmiredbyhisfriends.Whenheisoutinthecountrywherethereareafewpeopledrivingandthetrafficrulesarenotstrictthis6adventureboywilldrive7extremefast.IntownshoweverthereisaspeedlimitthatisfiftykilometersanhourbutJackoftendrivesmuchfaster. OnedayJackwasdrivingthroughtownswhenayoungpolicemanwhowasnewtohiswork8stophimandsaidI'mafraidyouweredrivingatamorethanfiftykilometersanhourSir.Pleasegivemeyournameandaddress.9lookatthepolicemancarefullyJacksaidtohimWellsirIstartedmyjourneylessthananhourago.Onhearingthishedidn'tknowtheanswer10Jack'sexcuse.HethoughtforafewsecondsandthenletJackgo.
假设你是红星中学高三学生李华你的英国朋友Jim在给你的邮件中询问北京近几年的变化.请你根据以下要点进行回复.内容包括 1.变化是什么 2.对你的影响 3.期待朋友来北京 注意 1.词数不少于50 2.开头和结尾已给出不计入总词数. DearJim Yours LiHua
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WISHYOUWEREMORECREATIVE? Iwanttoaskyouafavor.Ihaveapairofpants.TellmeHowmanydifferentwayscanIputapairofpantstouse?Nowimagineyou'reanarchitect.Samequestion.Nowimagineyou'reBillGates.Ascubadiver.Amedievalknight.Youstillhavethepants.Whatalternativeusescometomind? Whatyoujustpracticed﹣﹣theconsciousactofwearinganotherself﹣﹣isanexercisethataccordingtopsychiatristSriniPillayMDisessentialtobeingcreative. Onegreatirony讽刺aboutourcollectiveaddictiontocreativityisthatwetendtoframeitinuncreativeways.ThatistosaymostofusmarrycreativitytoourconceptofselfEitherwe'recreativeorwearen'twithoutmuchofamiddleground.I'mjustnotacreativeperson!adiscouragedstudentmightsayinartclasswhileanothermightblamehertalentatpaintingforherdifficultiesinmathmakingacommentI'mveryright﹣brained. Dr.PillayanassistantprofessoratHarvardUniversityhasspentyearsoverturningtheseideas.Hebelievesthatthekeytounlockingyourcreativepotentialistochallengethestereotyped陈词滥调的advicethaturgesyoutobelieveinyourself.InfactyoushoulddotheoppositeBelieveyouaresomeoneelse. Hepointstoastudyshowingtheimpactofstereotypeonone'sbehavior.TheauthorspsychologistsDenisDumasandKevinDunbardividedtheircollegestudentsubjectsintotwogroupsinstructingonegrouptothinkofthemselvesaseccentricpoetsandtheothertoimaginetheywererigidlibrarians.Theresearchersthenpresentedthemallwithordinaryobjectsincludingaforkacarrotandapairofpantsandaskedthemtocomeupwithasmanydifferentusesaspossibleforeachone.Theformergroupcameupwiththewidestrangeofideaswhereasthelatterhadthefewest. Theseresultssuggestthatcreativityisnotanindividualcharacteristicbutaproductofcontextandperspective.Everyonecanbecreativeaslongasheorshefeelslikeacreativeperson. Dr.Pillay'sworktakesthisastepfurtherHearguesthatsimplyidentifyingyourselfascreativeislesspowerfulthantakingthebravecreativestepofimaginingyouaresomebodyelse.ThisexercisewhichhecallspsychologicalHalloweenismreferstotheconsciousactionofwearinganotherself.Anactormayemploythistechniquetogetintocharacterbutanyonecanuseit.AccordingtoDr.Pillayitworksbecauseitisanactofconsciousunfocusacollectionofbrainregionsthatspringintoactionwhenyou'renotfocusedonaspecifictaskorthought.Mostpeoplespendnearlyhalfoftheirdaysinastateofunfocus.Thisdoesn'tmakeuslazyitmakesushuman. Imaginingyourselfinanewsituationoranentirelynewidentityneverfeltsoproductive.You'remakingyourselfmorecreativeandyou'regivingyourselfpermissiontodosomethingyou'dotherwisefeelguiltyabout. 1What'sthefunctionofthequestionsinparagraph1? A.Toleadinthetopic. B.Tomakeacomparison. C.Tostateanopinion. D.Toaskafavor. 2ThestudyledbyDenisDumasandKevinDunbarproves. A.creativityisanindividualcharacteristic B.librariansaremorecreativethanpoets C.ordinaryobjectscanimprovecreativity D.yourcreativityisdeterminedbyyourself 3AccordingtoDr.PillayHalloweenismworksbecause. A.itisanactofunconsciousfocus B.certainbrainareasbegintoacttogether C.peopleareinastateoflaziness D.allactorsemploythistechnique 4Ifyouwanttobemorecreativeyouaresupposedto. A.focusonaspecifictask B.believeinyourowntalent C.pretendtobesomeoneelse D.turntoberight﹣brained
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AroundlunchtimetodaymysonandIwerewalkinginourcommunity'sbusydowntownarea.Wepassedbyahomelessmansittingonthestreet.SinceIhadnocashonmeallwecouldgivehimwasagoodwish.AswewalkedbymysonaskedmeDidn'tyouhaveanymoneytogivehim?IsaidIdon'thavecash.Butwhydon'tweaskhimifhewouldlikesomethingtoeat? Onourwaybackonthatstreetafterdoingourerrand差事wesawthesamemanandaskedhimifhewouldlikeustogethimsomelunch.HisfacebrightenedupandwhenIaskedwhathewouldlikehejustsaidanythingisfine.SothenmysonpointedtoaratherfancylookingParisiancafétypeofplaceacrossthestreetandwedecidedtogointhere.Wellofcourseitwaslunchtimeandtheplacewaspacked!Westoodinlineforawhilelookingatpastries酥皮糕点thatIknewwewerenotgoingtobuy.Thenwedecidedonahotsandwichforthehomelessman. Afterorderingandpayingbycreditcardwesatandwaited…andwaited…andnotapeepoutofmysonaboutwhyitwastakingsolong…aftersomeunluckyeventswiththeorderandthepackingofato﹣goboxwefinallygotoutofthere.MysonsaidIhopethemanisstillthere!Andhewas.AndhewassohappyittookussolongI'msurehemusthavethoughtweweren'tcomingback…itmadeourday.Wecamehomemadeourselvessomelunchandenjoyedtherestoftheafternoon. 1Whydidn'ttheauthorgivemoneytothehomelessman? A.Hewasverypoortoo. B.Hehatedthehomelessman. C.Hewasunwillingtohelpthepoor. D.Hehadnocashonhim. 2Whatdidthehomelessfeelwhenaskedifhewouldlikesomelunch? A.Happy. B.Surprised. C.Concerned. D.Frightened. 3Whatdoestheunderlinedwordpackedinparagraph2mean? A.Conquered. B.Busy. C.Crowded. D.Reserved. 4Whatcanbethebesttitleforthetext? A.ASandwich B.MySonandI C.Ahomelessman D.Lunchtime
WesentNancyourconherwinningthegoldmedalinthe1500metersrace.
Studentsshouldbetoldthatnobooksaretobetakenoutofthereadingroomwithoutp.
已知＝2sinα＝1cosα且∥则＝．
已知数列{an} 则a99＝．
AhospitalhasbeenforcedtobanPokemonGoplayersfromthesiteafteramonsterhub妖怪枢纽站wasfoundintheA&Edepartment.RoyalStokeUniversityHospitaldiscoveredthatitscasualtyunit急诊室isonthesamespotasaPokemonGo‘gym'﹣whereplayerscantraintheirnewlycaughtNintendocreatures. TheUniversityHospitalsofNorthMidlandsTrustagreedlastweekthatpatientscanplayPokemonGoonwardsbecausewalkingaroundishealthy.ButtheTrusthasbeenforcedtopostawarningonitswebsiteaboutpublicaccesstoA&E.ItsaidifPokemonGobecomesamajorannoyanceitwouldaskNintendo﹣whichdecidesonthelocationsofthevirtualgymsaccordingusingGPS﹣tohaveitremovedfromthepremises道馆. KevinParkerassociatechiefnursesaidMembersofthepublicwhodonotneedtobeatRoyalStokeshouldnotattempttoenterA&Eoranyotherpartofthehospitalbuildingtoplaythegame.TheA&Edepartmentisincrediblybusythissummer.Wewantthepublictounderstandthatanybodywhovisitsthehospitalsolelytoplaythegamewillprovideanunwanteddistractiontotheimportantworkofthehospital.I'malsoawareofvariousreportsinthemediaofunsafeareasthatthegamehasbeenplayedin. RoyalStokeUniversityHospitalisasafeareawheregamerscanenjoyPokemonGo.MichelleHarristheTrust'smanagersaidthegamecouldstillbeplayedbythosealreadyinhospital.WerecognisethatthePokemonGogameencourageswalkingandexercisewhichissomethingthattheTrustisequallykeentopromoteshesaid. ThereareanumberofwalkingroutesestablishedthroughouttheTrustthatcanbeusedtocombinewalkingandplayingthegame.Walkingjust30minutesfivetimesaweekcanhelpreducetheriskofpreventableillnessessuchasobesitydiabetesandheartdisease. TherehavebeenseveralwarningsaboutthegamesinceitsUKrelease.LastweekagroupofteenagersinWiltshirewereleftstrandedalmost100ftundergroundaftertheygotcarriedawaysearchingforPokemonGocharacters.Thefourboysaged16and17endedupgettinglostandhadtowaittogetaphonesignalbeforetheycouldcallforhelp.EventuallytheycontactedDorsetandWiltshireFireandRescueteamwhotookthemtosafety.DamienBenceofthefireandrescueteamsaidPokemonGoisobviouslyleadingpeopleintodangeroussituations. 1ItseemsthatPokemonGoisagame. A.designedtohelppatientshaveaquickrecoveryinhospital B.helpingcuresuchdiseasesasobesitydiabetesandheartdisease C.encouragingplayerstowalkandexerciseinsteadofstayingindoors D.warningteenagersoftheplaceseasytogetlostorattacked 2TheA&Edepartmentisincrediblybusybecause. A.morepatients'arrivalincreasestheworkloadoftheA&Edepartment B.doctors'playingthegamemakestheA&Edepartmentlessefficient C.players'injuryincreasestheworkloadoftheA&Edepartment D.players'arrivaldisturbstheworkoftheA&Edepartment 3Theunderlinedwordinthelastparagraphprobablymeans. A.hurt B.disturbed C.trapped D.threatened 4Thepassageismainlyabout. A.thenegativeeffectsofPokemonGosinceitsUKrelease B.theapplicationsofPokemonGoinhospitalssinceitsUKrelease C.thepopularityofPokemonGosinceitsUKrelease D.theestablishmentofPokemonGovirtualgymssinceitsUKrelease
HalfaDay Iwalkedalongsidemyfatherholdinghisrighthand.Allmyclotheswerenewtheblackshoesthegreenschooluniformandtheredcap.TheydidnotmakemehappyhoweverasthiswasthedayIwastobethrownintoschoolforthefirsttime. Whyschool?Iaskedmyfather.WhathaveIdone? I'mnotpunishingyouhesaidlaughing.School'snotapunishment.It'saplacethatmakesusefulmenoutofboys.Don'tyouwanttobeusefullikeyourbrothers? Iwasnotconvinced.Ididnotbelievetherewasreallyanygoodtobehadintearingmeawayfrommyhomeandthrowingmeintothehugehigh﹣walledbuilding. Whenwearrivedatthegatewecouldseethecourtyardvastandfullofboysandgirls.Goinbyyousaidmyfatherandjointhem.Putasmileonyourfaceandbeagoodexampletoothers. Ihesitatedandsqueezedhishandfirmlybuthegentlypushedmefromhim.Beamanhesaid.Todayyoutrulybeginlife.Youwillfindmewaitingforyouwhenit'stimetoleave. Itookafewsteps.Thenthefacesoftheboysandgirlscameintoview.Ididnotknowasingleoneofthemandnoneofthemknewme.IfeltIwasastrangerwhohadlosthisway.ButthensomeboysbegantoglanceatmeincuriosityandoneofthemcameoverandaskedWhobroughtyou? MyfatherIwhispered. Myfather'sdeadhesaidsimply. Ididnotknowwhattosay.Thegatewasnowclosed.Someofthechildrenburstintotears.Thebellrang.AladycamealongandsaidThisisyournewhome.Therearemothersandfathersheretoo.Everythingthatisenjoyableandbeneficialishere.Sodryyourtearsandfacelifejoyfully. Wellitseemedthatmymisgivingshadhadnobasis.FromthefirstmomentsImademanyfriends.Ihadneverimaginedschoolwouldhavethisrichvarietyofexperiences. 1Onthewaytoschooltheboyfelt. A.happy B.embarrassed C.upset D.excited 2AboutschoolingFathersuggested. A.wearingasmile B.tearinghimselfawayfromgames C.waitingforparents D.throwinghimselftostudying 3helpedhimmostonthefirstdayatschool? A.Teachersandclassmates B.Courtyardsandbuildings C.Fatherandbrother D.Newuniformsandshoes 4Whatwouldprobablyhappennext? A.Theschoollifewouldturnouttobeafailure. B.Boysintheschoolwouldwatchhimcuriously. C.Hewouldopenupanewjourneyofcolorfullife. D.Hisparentswouldaccompanyhimattheschool
△ABC中内角ABC所对的边分别是abc已知asinB＝bcos 1求角A的大小 2设b＝4△ABC的面积为3求a的值．
已知数列{an}的前项和Sn＝1﹣5+9﹣13+17﹣21+…+﹣1n﹣14n﹣3则S51的值为
Worththepainintheend Iusedtohaterunning.ItseemedtoohardandpushingoutsidemycomfortzonewasnotsomethingIwasraisedtodo. InfactIwouldn'thavebecomea1ifitweren'tformyhusbandCharles.Hehadbeenaseriouscompetitiverunnerformanyyears.Afterourmarriagehewouldn'tstoptalkingabouthowmuchhemissedit. Sostartrunningagainwhydon'tyou?Iwasgetting2ofhearingaboutit. SohepickeditupagainandafteraboutayearIstartedtojoinhimatthetrack跑道.JustafewweekslaterCharlessignedusbothupforafive﹣kilometerrace.I3aboutdoingit.Itwastoosoon. Buton4daythereIwas. Thegunwent5.Thousandsofrunnerspushedforward. Thefirstkilometerwas6. Idon'tthinkI'mgoingtomakeit.Iwasalreadybreathingheavilyandpainfullyawareofthegroupofrunners7pastme. Noyou'redoing8saidCharles.Hewastryingtoencouragemetogetmefocusedonsomethingotherthanmy9. Ican'tIsaid10audibly听得见地. Hetriedadifferentwayto11me.Justmakeittothathouseandlet'sseehowyoufeel. AfteranotherminuteIsawthethree﹣kilometer12.AllIcouldthinkofwasthatIwasdyingandthatmyhusbandwastorturing折磨me. Miserabledoesn'tevenbegintodescribe13Ifelt.Andtherewassomuch14. You'llbefine.You'vegotlessthanakilometertogo. Iroundedacornerandsawbothsidesofthestreetthickwithpeoplewatchingtheraceallcheeringtherunnerson.I15mylegstokeepgoing. ThenIlookedupandsawtheclock.Thesecondstickingaway一分一秒地过去gavemeanincentive助力.IknewthatifIfinishedthisraceIwouldhaveachievedsomething.SoIstraightenedupandkickedit. IhadmyarmsheldhigherwhenIpassed16thefinishline.Avolunteerputa17aroundmyneck. Youdidgreat!I'mso18ofyou!CharleswasthrilledthatI'd19it. ThatwasAMAZING!Iwanttodoanotherrace.Thisrunningstuffisamazing!Iproudlyhuggedmymedalaswestartedtowalktothepost﹣racefestivities. Mylungsandmycomfortzoneboth20. 1A.runner B.traveler C.racer D.cheerleader 2A.afraid B.tired C.aware D.confident 3A.thought B.dreamed C.hesitated D.cared 4A.race B.sport C.show D.task 5A.on B.off C.up D.down 6A.long B.short C.easy D.tough 7A.brushing B.walking C.pounding D.sliding 8A.wrong B.right C.great D.bad 9A.disability B.dishonor C.disgrace D.discomfort 10A.barely B.nearly C.merely D.roughly 11A.advise B.persuade C.order D.force 12A.signal B.symbol C.point D.mark 13A.how B.what C.when D.why 14A.sweat B.anger C.pain D.pleasure 15A.willed B.dragged C.pulled D.supported 16A.by B.over C.at D.through 17A.ring B.necklace C.medal D.scarf 18A.ashamed B.guilty C.sure D.proud 19A.done B.made C.taken D.caught 20A.developed B.expanded C.changed D.progressed
已知等差数列{an}中a1与a5的等差中项为11a2＝8 1求{an}的通项公式 2令bn＝求证数列{bn}的前n项和Tn＜．
已知数列{an}的前项和为Sn2Sn＝3an﹣1n∈N*． 1证明数列{an}是等比数列并求其通项公式 2今bn＝若bn＞0对n∈N*恒成立求λ的取值范围．
OxfordandCambridgehavenowdecidedtoremovethewordsCAN'TandIMPOSSIBLEfromtheirdictionary.JessicaCoxbornin1983inArizonaistheworld'sfirstlicensedarmlesspilot. ThegirlfromTucsonArizonagottheSportPilotcertificatelatelyandbecamethefirstpilotlicensedtoflyusingonlyherfeet.JessicaCoxwasbornwithoutarmsbutthathasonlystoppedherfromdoingonethingusingthewordcan't. CoxgraduatedfromtheUniversityofArizonain2005withabachelor'sdegreeinpsychologyandaminorincommunications.Coxhasnotusedprostheticarmssincesheturned14.Usingherfeetasmostpeopleusetheirhandssheisableamongotherthingstodriveanunmodifiedcarwithanunrestrictedlicensetotypeonakeyboardat25wordsperminuteandtoputinandremovehercontactlenses. JessicaCoxflewinasingleengineairplaneforthefirsttimeviaWrightFlightin2005.Coxearnedherpilot'scertificateonOctober102008afterthreeyearsoftrainingandisqualifiedtoflyalight﹣sportaircrafttoaltitudeof10000feet. She'sagoodpilot.She'srocksolidsaidParrishTraweek42theflyinginstructoratSanManuel'sRayBlairAirport.ParrishTraweekrunsPCAircraftMaintenanceandFlightServicesandhastrainedmanypilotssomeofwhomdidn'tcomeclosetoCox'sabilities. Doctorsneverlearnedwhyshewasbornwithoutarmsbutshefiguredoutearlythatshedidn'twanttouseprostheticdevices.SothenexttimeyouarereadytotellyourselfIcan'tpossibly…rememberthisamazingyoungwomanandchangeyourvocabulary. 1Whatcanwelearnfromthefirstparagraphs? A.OxfordandCambridgefeltalittledisappointed. B.Noarmlesspeoplehadgotapilotcertificatebefore. C.JessicaCoxwasn'tallowedtousethewordcan't. D.Thewordcan'twoulddisappearfromtheEnglishdictionary. 2WhatdoyouthinkofJessicaCox? A.Sheisacleverandbravegirl. B.Sheispositiveanddetermined. C.Sheisindeedapoorlyeducatedgirl. D.Sheonlytakesinterestinaircraft. 3WhatdoestheunderlinedwordprostheticmeaninParagraph3? A.artificial B.damaged C.unusual D.abnormal 4AftergraduatingfromuniversityJessicaCox. A.sufferedfailurewhensearchingforjobs. B.madeastarttotaketrainingtobecomeapilot C.decidedtouseherfeetasmostpeopleusehands. D.triedherbesttotakecareofherselfinherdailylife.
Marshaseemedlikeaniceenoughlady96yearsold.Shehada1heartandonlymonthstolive.That'swhyIwas2heratthenursinghome.Shewasgladtohearme3fromtheBiblebutsuddenlysheburstinto4.WhenIgettoheavenshesaidI'mgoingtotellGodto5myfatheroutofthere.Idon'teverwantto6himagain.Ididn'tknowhowtorespondtothatbutIwantedtohelpherunlock打开her7. IwenthomewonderingifIwouldbelikeMarshaather8.Aloudvoiceinsidemewasforcinganuncomfortable9Isn'ttheresomebodyyouneedtoforgive?FranklytherewassomethingIdidn'twantto10. IgrewupinChicago.MybrotherJohnwas12years11thanmeandalwaysyelledatme.EverythingIdidwas12.Icouldn'tgetalongwellwithhimsoIcuthimoff.Icouldn'tseehowoldwoundcouldhurtus13inthelastdaysoflifeuntilImetMarsha. Ireadallaboutforgiveness宽恕includingeverythingIcould14intheBible.ItoldmyselfitwastohelpMarshabut15betoldIwasdesperate绝望的tohelpmyself.Liketheysaywhenyoucan'tstopbeingangrywithsomeonethepersonyouendup16themostisyourself.SoIfinallytookthecouragetocallhim. Idon'twanttobe17atyouanymoreIsaid.I'mreadytostartover.Whateverourproblemshavebeenareinthepast.Therewasabrief18ontheotherend.IagreeJohnsaidatlast.I'lltrytodobetter. ThelasttimeIsawMarshashewastooweaktotalk.Idon't19ifshewouldforgiveherfatherwhenshegottoheaven.EitherwayIhopedthattheyworkeditoutlikemy20andI. 1A.healthy B.artificial C.weak D.soft 2A.waiting B.pitying C.welcoming D.visiting 3A.receive B.read C.hear D.recover 4A.anger B.tears C.laughter D.hunger 5A.discover B.bury C.kick D.help 6A.harm B.look C.comfort D.see 7A.heart B.suitcase C.door D.backpack 8A.height B.age C.life D.request 9A.environment B.ending C.question D.period 10A.thinkabout B.givein C.dressup D.playwith 11A.longer B.taller C.higher D.older 12A.natural B.wrong C.easy D.hopeless 13A.only B.just C.even D.always 14A.find B.admire C.recognize D.spare 15A.excuse B.reason C.advice. D.truth 16A.accepting B.hurting C.working D.performing 17A.shy B.good C.mad D.strict 18A.silence B.break C.introduction D.time 19A.understand B.remember C.inspect D.know 20A.God B.brother C.father D.voice
LearningEnglishwellishardworkbutifyouworkhardatityouwillsintheend.
ItisgoodmforanArabtostandclosetohisfriendswhentheyaretalking.
Bytheageoftwoachildwillhaveavofabouttwohundredwords.
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,x∈R. y=x3+1,x∈R.
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