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已知:a+b=3,ab=2,求a2+b2的值.
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已知A.=2a2+3ab-2a-1B.=-a2+ab+11当a=-1b=2时求4A.-3A.-2B.
已知A.=2a2+3ab﹣2a﹣1B.=﹣a2+ab﹣11求4A﹣3A﹣2B的值2若A.+2B的值与
已知A.=2a2+3ab-2a-1B.=-a2+ab-1.1求3A+6B2若3A+6B的值与a的取值
已知a+b=3ab=2求代数式a3b+2a2b2+ab3的值.
计算1ab22·-a3b3÷-5ab
已知A.=2a2+3ab-2a-1B.=-a2+ab-11求3A+6B2若3A+6B的值与a的取值无
某化合物的分子式为AB2
属ⅥA.族元素,
属ⅦA.族元素,A.和B.在同一周期,它们的电负性值分别为3.44和3.98,已知AB2分子的键角为103.3°。下列推断不正确的是( ) A.AB2分子的空间构型为“V”形 B.A.-B.键为极性共价键,AB2分子为非极性分子
AB2与H2O相比,AB2的熔点、沸点比H2O的低
AB2分子中无氢原子,分子间不能形成氢键,而H2O分子间能形成氢键
根据化学方程式3AB+C2B3=2C+3x确定x的化学式为
A.3B2
A.2B3
AB2
AB3
已知A.=2a2+3ab-2a-1B.=-a2+ab-11求3A+6B2若3A+6B的值与a的取值无
已知a+b=4ab=1求2a+3ab+2b的值
已知A.=2a2+3ab-2a-1B.=-a2+ab-1⑴求4A-3A-2B的值⑵若A.+2B的值与
已知A.=2a2+3ab-2a-1B.=-a2+ab-11求4A-3A-2B的值2若A.+2B的值与
已知a+b=-2ab=3求2[ab+-3a]-32b-ab的值.
已知a-b=3ab=2求1a+b22a2-6ab+b2的值.
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已知a+b=4ab=﹣2求代数式4a﹣3b﹣2ab﹣a﹣6b﹣ab的值.
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S(AB)<S(A2B)
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A.2B
AB2
AB3
AB
已知a-b=3ab=2求1a+b22a2-6ab+b2的值.
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第一节短文改错 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仅限一词. 2.只允许修改10处多者从第11处起不计分. Whatdoyoudowhenthereisanearthquake?Mostpeoplewilltrytoleavingthebuilding.Nobodywantstobetrapunderthebuilding.Iliveonthethirdfloorofanapartmentbuilding.Iguessifanearthquakecame.Iwouldprobablejustpanic.IwouldnotthinkaboutthatIneededtodosuchashidingsomewhereandrunningoutofthebuilding.Ifeelanearthquakelastweek.Itwasasmallearthquakeanditlastedonlyfewseconds.Therewerenoinjuryordamages.Iwasnotfrightened.Ididn'trunoutofmyhouse.InsteadofIhidmyselfunderastrongtableprotectingmyselfheadwithapillow.
如图在四棱锥P﹣ABCD中PA⊥平面ABCD底面ABCD是菱形PA=AB=2∠BAD=60°. Ⅰ求证直线BD⊥平面PAC Ⅱ求直线PB与平面PAD所成角的正切值 Ⅲ已知M在线段PC上且BM=DM=2CM=3求二面角B﹣MC﹣D的余弦值.
CityCollege ADMISSIONREQUIREMENTS Allhighschoolgraduatesandanyone18yearsofageorolderwithorwithoutahighschooldiplomaaresuitableforadmission.Individualsundertheageof18whopossessahighschooldiplomaarealsosuitableforadmission. HOWTOEVROLLINCREDITCOURSES Newandreadmittedstudentsmustcompleteandsubmit提交acreditadmissionsapplicationformavailableonlineatwww.ccsf.edu. BEFOREYOUREGISTER ●LearnaboutyourskilllevelinEnglishandMaththroughourassessmentservice ●Attendanorientation新生报到会tohearaboutsupportservices ●Meetwithacounseloradvisertoselectyourcourses ●Findoutifyouqualifyforbeingfreefromtheentranceexaminations. HOWTOENROLLINNONCREDITCOURSES CoursesinNoncreditProgramsarefreeofchargenoenrollmentfee.Forinformationonhowtoenrollinnoncreditcoursesclickhere. PARKING Studentsfacultyandstaffareencouragedtousepublictransit.ClickhereforParkingRegulations. SERVICES CityCollegeservicesincludeabookstorecafeteriahealthcentertutoringcentercareerandtransfercentercounselingfinancialaidlibrarylearningresourcecenterstudentgovernmentofficescampuspolicedisabledstudentsprogramsandmore. 1WhichkindofthefollowingpeoplecouldnotbeadmittedtoCityCollege? A.Ahighschoolgraduate B.Asixteenboywithoutahighschooldiploma C.Anadultwithoutahighschooldiploma D.Anyonewhopossessesahighschooldiploma 2Whatdoweknowabouttheentranceexaminationsfromthepassage? A.Allnewandreadmittedstudentsmusttaketheexaminations B.ThosewhoarepoorinEnglishandMathmusttaketheentranceexaminations C.Notallthenewstudentsarerequiredtotaketheentranceexaminations. D.Theentranceexaminationsarefreeofcharge. 3Wherecanthispassagebefound? A.Inacollegenewsreport B.Inanewspaperadvertisement C.Inatourguide D.Onaneducationwebsite.
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Formostpeoplegraduationdayisexciting.Mygraduationday41wasnot. Irememberthatweekendtwoyearsago.Myfamilyandmyfriendshadcometowatchourclasswalkacrossthat42.ButlikeeveryoneinmygraduatingclassIhadwatchedtheeconomy43frombadtoworseduringmysenioryears.Wegraduateshad44butverylimitedprospects前景.Numerousapplicationswere45andIknewthatthenextdaywhenmylease租约endedIwouldnolongerhaveaplaceto46home. Theweeks47werenoteasy.IdrovetoCaliforniatofindwork.ButwhatIthoughtwould48meaweekdraggedintotwoandthenfourand100jobapplicationslaterIfoundmyself49Iwasbefore. Days50likeweeksweekslikemonthsandthosemanymonthsseemed51.Themost52partwasnomatterhowmuchItriedIjustcouldn'tseemtomakeany53. ThenIbegantowrite.SomethingaboutputtingwordsonapagemadeeverythingseemalittleClearer﹣alittlebrighter.Somethingaboutwritinggaveme54. Iputmyfrustrationintoachildren's55onestoryofwhichwasaboutan56alittlefishwhofightinginariver57togiveuphisdream.Ikeptonwriting.Andthenoneday58anysortofwritingdegreeorcontactsinthewritingworld﹣justalotofhardworkandperseverance﹣Iwasofferedapublishingcontractformyfirstbook!Afterthatthingsbegantobein59soon.Iwasofferedasecondbookdeal.ThenafewmonthslaterIgotaninterviewwiththeWaltDisneyCompanyandwashiredshortlyafter. ThelessonofthestoryWorkhardgiveittimeanddon'tgiveup.Oftenourdreamslieinwaitjustalittlefurtherupstream.Allweneedisthe60topushbeyondtheriver. 41.A.still B.however C.otherwise D.besides 42.A.period B.moment C.stage D.line 43.A.go B.become C.keep D.appear 44.A.exams B.papers C.documents D.degrees 45.A.successes B.surprises C.wonders D.failures 46.A.live B.call C.stay D.move 47.A.ahead B.early C.before D.ago 48.A.give B.pay C.take D.spend 49.A.who B.where C.what D.how 50.A.felt B.flew C.fell D.followed 51.A.meaningless B.helpless C.endless D.hopeless 52.A.interesting B.surprising C.amazing D.frustrating 53.A.effort B.progress C.sense D.effect 54.A.hope B.dream C.future D.strength 55.A.story B.magazine C.book D.journal 56.A.hero B.poet C.writer D.actor 57.A.replied B.responded C.returned D.refused 58.A.without B.except C.through D.among 59.A.sight B.action C.place D.order 60.A.love B.sympathy C.courage D.kindness
Everytime70﹣year﹣oldAndyMackiedrawsabreathit'smusictohisears﹣whetherthere'saharmonica口琴thereornot. MackieaScottishbornretiredhorsetrainerlivesinacamperinnorthwestWashingtonState﹣helivesthereeventhoughtechnically﹣medically﹣heshouldhavediedlongago. AfterhisninthheartsurgeryMackie'sdoctorshadhimon15differentmedicines.Butthesideeffectsmadelifemiserable.Soonedayhequittakingall15anddecidedtospendhisfinaldaysdoingsomethinghealwayswantedtodo. Heusedthemoneyhewouldhavespentontheprescriptionstogiveaway300harmonicaswithlessonsincluded.IreallythoughtitwasthelastthingIcouldeverdohesays. Andwhenhedidn'tdiethenextmonthheboughtafewhundredmore. HarmonicasinhandheexplainsIjuststartedgoingfromschooltoschool. It'snow11yearsand13000harmonicaslater. TokeepthekidsinterestedinmusicastheygetolderMackienowspendsmostofhisSocialSecuritycheckmakingthembeginnerst.ringinstruments.Healsobuysstore﹣madeinstrumentsforkidsthatshowaspecialinterest.Heprovidesfreelessonstoeveryonebygettingtheolderkidstoteachtheyoungerkids. MackiesaysItellthemmusicisagift﹣yougiveitawayandyougettokeepitforever. TheendresultissomethingtrulyuniquetohiscornerofWashington.Itseemseverywhereyoulookeveryplaceyougoeverykidyoumeethasthesamepassionformusic. Ican'texplainthejoyMackiesays.Idon'tthinkBillGatesfeelsanyricherinsidethanIdo.Hebelieveshe'sstilllivingtodaybecauseofthekidsandthemusic. Andhedoesn'texpectanyharmonicaopeningsinheavenanytimesoon. Idon'tthinkthelordwantsmeyetIstillgetsomethingtodo﹣lotsmorekidsoutthere. 24.ItcanbeinferredthatMackiequittakingmedicines. A.fullofconfidence B.fullofexcitement C.withthehopeofrecovery D.withoutanyhopeofsurvival 25.TheunderlinedsentenceindicatesthatMackie A.believeshewillcontinuetolive B.isafraidhewillnotlivelong C.doesn'tthinkharmonicasareneededinheaven D.doesn'tthinkthereareharmonicasinheaven 26.WhatisMackiegoingtodoinfuture? A.Togetmorekidsinterestedinmusic. B.Togiveawayothermusicalinstruments. C.Totrainkidstoplaytheharmonicabetter. D.Togivemusiclessonstoolderkids. 27.WhatdoesthetextmainlytellusaboutMackie? A.Heremainsaharmonicaplayerinspiteofpoorhealth. B.Hesurvivesheartdiseasebecauseofmusicandkids. C.Hebecomesasuccessfulmusicianinspiteofpoorhealth. D.Hemakesmusicpopularbyprovidingfreemusiclessons.
根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. Youhavetheeducationandtheworkexperience.36Howevertohaveasuccessfuljobinterviewthesearestillseveralthingsyoushoulddo. 1.Knowaboutthecompanywhereyouaretryingtogetajob.Findoutwhatthecompanydoesandwhotheircompetitorsare. 2.37Mostinterviewerswillaskaquestionrelatingtoyourstrengthsandweaknesses.Beforetheinterviewexaminethejobyouareapplyingforanddeterminethetopskillsneededforthatposition.Forinstanceifyouareapplyingforajobasatelephoneoperatorit'smoreimportantthatyouhavestrongcommunicationskillsthanthatyouaretidy. 3.Haveevidence.38Butifyoucantelltheintervieweraboutatimeyouorganizedaneventitmakethefactmuchmoresolid 4.Preparequestionstoaskaboutthecompanyandthejob. 39Whenyouareunderpressureitcanbedifficulttothinkstraight.Preparingbeforetheinterviewwillmakeiteasiertogiveanswerstothosetoughquestions.Butyoucan'tthinkofeveryquestiontheymightask.40Rememberfirstimpressionsarelasting. A.Aninterviewisastressfulevent B.Sorelaxandbeconfident C.Goodorganizationalskillaremorethanimportant D.Knowyourcompetitors E.Knowyourself F.Nowallyouneedisthejob G.It'seasytosayyouhavegoodorganizationalskills.
WhenIwasyoungmyfamilybuiltanantfarmforme.Shortlyaftertheantsweredroppedintotheglassbox41sandtheygottoworkmakingtunnels隧道.Iwasamazedthateachoneknewexactlywhattodo.I42theants.MyfavoritewasthebiggestCinderella. Onedayadisaster43theantfarm.IhadputmyfacesoclosetothestructurethatIaccidentallytippeditover44allthetunnels.Althoughtheants45theirearthquakeonebyonetheybegantodie.IwashorrifiedasIwatchedthem46theirtunnel﹣buildingtocarrythebodiestoacornerofthefarm.Mymotlierreportedthattheantsweredyingof47.Theysimplycouldnotstandthe48thattheirtunnelshadbeendestroyed.Cinderellawasthelastto49shedid∞whilecarryingadeadantonherback. 50muchtimehaspassedIstillthinkofthatantfarm.Momhad51itwouldteachmeaboutthenaturalworldbutittaughtme52.Icametorealizetheantswerea53inthebenefitsofteamwork.Working54theywereabletocreateanamazingworldforthemselves.Ialsolearnedthattheyshouldbe55fortheirhardwork.Dayinanddayouteachlaboredattheirtask.Buttherewasanevenlarger56thatIdidnotrealizeuntilrecentlyMisfortuneisanaturalpartoflifeandmustbe57. SoItrytolivemylifelikethosehardworkingants.But58themJtrynottoletfailuredefeatme.IsupposeIcouldhavelearnedallthisbystudyinggreatmomentsinhistoryorreadingaboutgreatleadersbut59anantnamedCinderellashowedmeeverythingIneededtoknowwhenIwasachild.Ihaveto60buildingmytunnels. 41.A.farfrom B.nextto C.fullof D.shortof 42.A.protected B.named C.enjoyed D.counted 43.A.knocked B.kicked C.beat D.struck 44.A.exposing B.destroying C.changing D.burying 45.A.survived B.avoided C.suffered D.remained 46.A.carryon B.keepoff C.beginwith D.giveup 47.A.failure B.overwork C.hunger D.anger 48.A.news B.discovery C.reality D.message 49.A.work B.appear C.die D.leave 50.A.Although B.Since C.Before D.Until 51.A.promised B.concluded C.hoped D.found 52.A.nothing B.everything C.less D.more 53.A.matter B.study C.material D.point 54.A.hard B.together C.actively D.independently 55.A.encouraged B.paid C.rewarded D.admired 56.A.notice B.secret C.lesson D.sign 57.A.accepted B.considered C.remembered D.noticed 58.A.unlike B.except C.without D.against 59.A.mostly B.instead C.again D.probably 60.Astop B.start C.enjoy D.keep
BestBitesofBeijingispublishedonFridaysandcoversthelatesthappeningsinthecapital'sdiningscene.Hereyouwillfindweeklyupdatesofnewrestaurantsseasonalmenusgooddealsandtrendsforthefoodieinyou.Forcommentsorrecommendationsemailjiangwj@chinadaily.com.cn. EasterafternoonteaatthePeninsulaBeijing EasterfunstartsthisweekendatthePeninsulaBeijingwherefamiliescanenjoyaChampagneSundaybrunchanEasteregghuntandotherfestiveactivities.ThehotelwillalsoupgradeitslegendaryPeninsulaAfternoonTeaforthisspecialoccasionwhichwillbehandcraftedbyExecutivePastryChefFredericMoreau.ExpectclassicandchocolatesconesservedwithhomemadecaramelmangojamlemoncurdandclottedcreamandEaster﹣inspiredpastries.Easterafternoonteaispricedat398yuanfortwoavailablefromApril14to17. EasterbuffetatNewWorldBeijingHotel Itisnottooearlytostartplanningforyournextweekendifyouhaveyoungchildren.DonotmissfunEasteractivitiessweettreatseggdecoratingandfacetimewiththeEasterBunny.TheEasterbrunchatTianTanKitchenoffersitall.Thebrunchispricedat148yuanperpersonwithhalfpriceforchildrenages6﹣12. MoreEasterfunFoodmusicandgames IfyouhavetheentiredaytospendwithyourchildrenonEasterDayheadtotheCityWeekendEasterPartyonApril16.Childrenshorterthan90cmeatforfreewhendiningwiththeirparentsduringbrunch288yuanperadult.Livemusicwillfeaturechildren'ssongsinbothEnglishandChinese.TheSpartanJuniorRacewillhavethelittleonescrawlingclimbingtumblingandjumpingthroughanumberofobstacles.TherewillalsobeothergamesforparentsandkidssuchasDrawSomethingGuesstheBabyandKidsDartsGame.Thepartywillbeheldfrom10amto4pm. 21.IfyouwanttocontactBestBitesofBeijingyoucanreachthemby. A.phoneB.letterC.emailD.Wechat 22.WhenisEasterafternoonteapricedat398yuanfortwo? A.FromApril6﹣12 B.FromApril14﹣17 C.FromApril16﹣18 D.FromApril14﹣27 23.Ifyouwanttopaylesswithyour6﹣year﹣oldchildwhois89cmtallwhichplaceisthebestchoice? A.NewWorldBeijingHotel B.CityWeekendEasterParty C.ThePeninsulaBeijing D.TheSpartanJuniorRace.
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.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. 修改在错的词下画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. DearSir IamLiHuaanundergraduatemajorinEnglish.I'dliketoapplythepositionasanoralEnglishtrainingteacherforthevolunteersofthe2022WinterOlympics. AstheEnglishmajorIhavebeenstudiedatNewYorkUniversityasanexchangestudentforoneyear.MyoralEnglishimprovedgreattherebecauseoftherealEnglishenvironmentandvariousactivitiesthatIlearnedmuchaboutwesternculture.Furthermoremyoutgoingpersonalitymakesitanadvantagetocommunicatewiththevolunteers.Otherwisethereisnoonemoresuitablethanyou. ConsideringthelevelsamongthevolunteersI'veplannedtogiveatrainingcoursewiththreelevelswhichbeginwiththebasics.Moreovermoreknowledgesbesideslanguagewillbedeliveredsuchasforeigncustoms. Lookingforwardtohearingfromyou. Yourssincerely LiHua.
假定你是李华.你们班的外教Smith先生即将回国.你将代表全班在欢送会上发言.请你用英文发言稿内容包括 1.赞扬Smith的人品和工作. 2.感谢他在学习和生活中给予的帮助. 3.表达对Smith的祝福. 注意1.词数100左右.发言稿的开头已给出不计入总词数. 2.可适当增加细节使行文连贯. DearMr.Smith It'shardtosaygoodbye.Wordscannotconveyourendlessloveandthankstoyouforyou'vedonesomuchforusintheseyears. .
若1﹣2aii=1+bi其中ab∈Ri是虚数单位则|a﹣bi|=
HavingdatedmyboyfriendforayearIgotanengagement订婚ringforChristmas.MomsistersandIsearchedbridalshops婚纱店formyweddingdressIwouldwearinJune.Wefinallyboughtabeautifuldressinalittleshopwhileitwastoolargeandcostly.WithnoalterationsintheshopIwouldhavetogetitresizedinmyhometown. NextmorningIwasinformedthatnumbersofhand﹣sewnpearls珍珠madethedressunaltered.AfriendrecommendedmeMrs.Whitewhodidalterationsathome.OnedayIvisitedMrs.White.Sheaskedmetotryitonandputpinsintotheshouldersandsidesofmydressandtoldmetopickitupintwodays. WhenthetimecametopickituphoweverIgrewdoubtful.HowcouldIhavelefta$1200weddingdressinthehandsofsomeoneIbarelyknew?Whatifshemadeamessoutofit? Thankgoodness.Thedressstilllookedexactlythesameasifithadbeenmadeespeciallyforme. Onesmallproblemsolvedabiggeronecameup.OnValentine'sDaymyhusband﹣to﹣besaidhewasnotreadytogetmarried.Iwasheartbroken.AnyhowIsurvived. OnedayinthefallofthatyearatthesupermarketIhappenedtoseeMrs.White.Shepolitelyaskedaboutmyweddingandwasshockedthatitwascanceled.IthankedheragainforadjustingmyweddingdressandaddeditwassafelybaggedformyMr.Right.WithalightinhereyesshebegantellingmeabouthersinglesonTim.ThoughIwasn'tintodatingagainIlethertalkmeintomeetinghim. OneyearlaterIdidhavemysummerweddingafterall.AndIdidwearthedressofmydreams﹣standingbesideTimthemanIhavesharedthelasteighteenyearsofmylifewithwhomIwouldneverhavemetwithoutthatspecialweddingdress. 28.Whendidtheauthorandherhusband﹣to﹣beplantoholdtheirwedding? A.InspringB.InsummerC.InfallD.Inwinter 29.TheunderlinedwordalterationsinParagraph1probablymeans. A.choicesB.exchangesC.aidsD.changes 30.Whatcanbelearnedabouttheauthor? A.Sheactuallygottoknowherhusbandviahermothers﹣in﹣law B.Shehadtogetherweddingdressadjustedbecauseofmanypearls. C.Sheforcedherhusband﹣to﹣betocancelthewedding D.Shesafelybaggedherdressandneverworeitagain 31.Whatcanbethebesttitleforthepassage? A.MyMother﹣in﹣law B.AnUnfortunateWoman C.MySpecialWeddingDress D.AWonderfulWeddingCeremony.
第一节完形填空 ThespringIwasinGradeThreemyteacherplannedactivitiestocelebratetheseason.ForweeksI41dying染色eggs.Itoldmomhowmuchfunitwouldbe.BeforethebigdaymyteachertoldustocometoclassonFridaywithanemptyinside42andourspellingtestsignedbyaparentandifwedidn'ttheteacher43wewouldsitoutfromtheactivities. AtnineyearsoldIwasthe44student.Iwashard﹣workingobedient顺从的andresponsible.SowhenIforgottobringmyspellingtestIwas45andfrightened.Iknewwhatthe46wouldbe.Whenmyclassjumped47fromtheirchairstocollectartsuppliesIsat48atmydeskfightingthewelling﹣uptears. Itwasn't49beforemyteacherpulledmeaside.ShekneltdownandtoldmeIshould50theclass.With51inhereyesshetoldmeIcouldbringmyspellingtestonMonday.Andthenshegave52ahug.My53disappearedwiththisunexpectedgift. Twentyyears54Istillrememberthatmomentwhenmyteachergraced使人增添优雅mewithloveand55.Shecouldhavestoodhergroundandletmesitoutasanexampletotheotherstudents.56sheknewpunishingmeforthissmall57wouldn'tteachmeanewlesson. ThelessonI58washowmuchgracecanliftsomeone's59Thismovesmeto60thesamegracetoothers. 41.A.lookedfor B.lookedinto C.lookedforwardto D.lookedthrough 42.A.bottle B.bag C.egg D.box 43.A.scolded B.warned C.praised D.believed 44.A.shy B.pretty C.annoying D.perfect 45.A.puzzled B.shocked C.funny D.fortunate 46.A.result B.cause C.reason D.exam 47.A.slowly B.hopefully C.heavily D.happily 48.A.still B.calm C.relaxed D.stubborn 49.A.short B.certain C.long D.soon 50.A.leave B.serve C.desert D.join 51.A.water B.trust C.sweat D.rain 52.A.us B.me C.mom D.them 53.A.satisfaction B.pleasure C.disappointment D.memory 54.A.ago B.before C.on D.later 55.A.understanding B.knowledge C.skill D.ability 56.A.and B.so C.or D.but 57.A.gift B.toy C.mistake D.art 58.A.learned B.taught C.had D.took 59.A.life B.spirit C.height D.quality 60.A.offer B.tie C.change D.compare
Theunusualabilityofblindpeopletosenseunseenobjectshasbeendemonstratedforthefirsttimeinsightedvolunteerswhosevisionwasblankedoutbyscientists. Thefindingssuggestblindsightwhichhasbeenobservedinblindpeoplewhoseeyesfunctionnormallybutwhohavesuffereddamagetothebrain'sVisualcentreisarealandnotimaginedphenomenon. Intheteststheblindhavebeenabletodistinguishbasicshapesofobjectstheycannotseeaswellastheirorientation定向anddirectionofmotion.Onotheroccasionsablindpersonhasreportedexperiencingafeelingthatanobjectispresentwhilenotbeingabletoseeit. Anumberoftheorieshavebeenproposedtoexplainblindsight.Generallyitissuggestedthatotherpartsofthebrainbesidestheprimaryvisualcortexrespondtonervemessagesfromtheeyesatanunconsciouslevel. ScientistsfromtheUniversityofHoustoninTexastemporarilyblindedagroupof12volunteersbyusinganelectromagneticfieldtoshutdowntheprimaryvisualcortex.Imageswerethenflashedinfrontofthemonascreen. Inoneexperimentvolunteerswereshowneitherahorizontal水平的orverticalbar.Inanotheraredorgreendotappeared. Mostofthetimethevolunteerswereunawareoftheimageswithwhichtheywerepresented.Buttheyguessedeithertheorientationofthebarorthecolourofthedotcorrectlymoreoftenthanwouldhavebeenexpectedbythelawofaverages. Theresearcherssaidthefindingssuggestedthatavisualpathwaybypassingtheprimaryvisualcortexmustberesponsibleforblindsight. 32.Whatdoweknowabouttheprimaryvisualcortexinthebrain? A.Itcanbereplacedbyotherpartsofthebrain. B.Itworksbysendingmessagestotheeyes. C.Itistheonlyparttoreacttomessagesfromtheeyes. D.Itisnottheonlyparttoreacttomessagesfromtheeyes. 33.Whywastheprimaryvisualcortexshutdownintheexperiment? A.Sothatthevolunteerscouldn'tsee. B.Sothatimagescouldflashonascreen. C.Inordertotestthevolunteers'eyes. D.Inordertogetmessagesfromtheeyes. 34.Whichofthefollowingcanreplacetheunderlinedwordbypassinginthelastparagraph? A.Leadingto.B.Goingaround.C.Existingin.D.Comingfrom. 35.Inthistexttheauthorexplains. A.whyblindsightisneeded B.howblindsightpossiblyoccurs C.howtheprimaryvisualcortexworks D.whytheprimaryvisualcortexisimportant.
Youmightnotrealizejusthowmuchworkgoesintomakinganewspaper.Apartfromsearchingforagoodstoryandtheendlesseditingrequiredtocorrectmistakescopyeditorsneedtomakesurethateverythingfitsperfectly.Agoodheadlinetellsasmuchaspossibleinashortspace.Thereneverseemstobequiteenoughspacetoexpresscompletelywhatyouwanttosay. Newsheadlinesoftenfocusonthecentralandmostimportantnewinformation.Therelevantlyinsignificantinformationmightbeleftoutinordertostressthemainideaorjusttobebrief.Newsheadlinesarefeaturedbythevividlanguage.Theyaddsomethingspecialtoattractreaders'eyes.Becausetheheadlineaimstodescribethemainfocusofthestoryinsixorsevenwordseverywordcountsandaccuracyisdecisive.Forinstancestab刺杀isabetterverbthankillbecauseittellsthereaderhowthecriminaldidhisdeedsimilarlyToyotaisabetternounthancar.Butthemakeofagoodheadlineisnotcharacterizednecessarilybytheamountofinformationinit.Forinstancethefront﹣pageheadlineontheLosAngelesTimesonSeptember11﹣thedayNewYork'sWorldTradeCenterwasattacked﹣simplyreadTERRORSTRIKESallincapitals.Whilethesetwowordsdonotdescribehowwhereorwhythebuildingswereattackedtheywereaccompaniedbyahalf﹣pagephotothatcaptured捕捉theeventinwhicharound3000peoplelosttheirlives. 1Whatisvitalinmakingnewsbesidesagoodstoryandperfectedition? A.Anappropriateheadline B.Acapitalheadline C.Vividlanguage D.Abriefreport 2Newheadlinesshouldbe. A.attractive B.countable C.insignificant D.longenough 3Theunderlinedwordtheyinthelastparagraphrefersto. A.thebuildings B.thetwowords C.thepeople D.thetwintowers 4TheexampleofTERRORSTRIKESisusedtosupporttheviewthat. A.agoodheadlinetellsasmuchaspossibleinashortspace B.newsheadingoftenfocusonthecentralandmostimportantnewsinformation C.agoodheadlineisnotmarkednecessarilybytheamountofinformationinit D.newsheadlinesarefeaturedbythevividlanguage
设xy满足约束条件则的取值范围是
Dr.CarolineLyonProfessorChrystopherNehanivandDr.JoeSaundershavecarriedoutexperimentsaspartoftheiTalkprojectwiththechildlikeiCubhumanoidrobottoshowhowlanguagelearningsppears.Initiallytherobotcanonlybabblespeaklikeababyandtakesspeechasastringofsoundsnotdividedupintowords.Afterhavingafewminutesofconversationwithhumansinwhichtheparticipantswereinstructedtospeaktotherobotasifitwereasmallchildtherobotadapteditsoutputtothemostfrequentlyheardunitsofpronunciationtoproducesomewordformssuchasthenamesofsimpleshapesandcolors. Dr.CarolineLyonsaidItisknownthatlittlebabiesaresensitivetothefrequencyofsoundsinspeechandtheseexperimentsshowhowthissensitivitycanbemodeledandcontributetothelearningorwordformsbyarobot. TheiTalkprojectteacherstherobotofspeakusingmethodssimilartothoseusedtoteachchildrenandisakeypartinthelearningprocessofthehuman﹣robotinteraction.AlthoughtheiCubrobotislearningtoproducewordformsitdoesnotknowtheirmeaningandlearningmeaningisanotherpartoftheiTalkproject'sresearch.Thesescientificandtechnologicaladvancescouldhaveasignificanteffectonthefuturegenerationofinteractiveroboticsystems. 32.What'sthefirstparagraphmainlyabout? A.Threescientists. B.TheiCubrobot C.Talksbetweentherobotandhumans D.Ascientificexperiment. 33.Wecaninferthatthischildlikerobotcan. A.hardlyspeakcompletesentences B.speakfluentlylikeahuman C.teachababytospeak D.betaughtbyitsrobotfellow 34.WhichofthefollowingcanindicateDr.CarolineLyon'sremarks? A.Theexperimentsareleanedbyarobot B.Babiesaremoresensitivetothesoundsinspeechthantherobot C.Theapproachofteachingkidscanbeadoptedtoteachtherobot. D.Therobotcanteachitselflikeababy. 35.Inthelastparagraphwecanlearnthat. A.theiCubrobothasagoodunderstandingofwords B.theexperimentsareentirelycomplete C.themainsectionoftheiTalkprojectliesinroboticsystems D.theiTalkproject'sresearchisatthebasicstage.
设△ABC的内角ABC所对的边长分别为abc且2b﹣ccosA=acosC. Ⅰ求角A的大小 Ⅱ若角B=BC边上的中线AM的长为求△ABC的面积.
已知函数fx=ex+ax的图象在点0f0处的切线与曲线y=﹣lnx相切则a=
WhydointerviewersliketoaskWhatareyourfavoriteinterestsandhobbies?atjobinterviews?Becausetheywanttodigdeepintoyourpersonallifeandgetabroaderperspectiveaboutyou.36. Ifyouhaven'timpressedtheintervieweryetyoumighteventurnthegameinyourfavorbytalkingaboutsomeimpressivehobbies.37.Youwouldn'twanttomissthisopportunity. DosandDon'tswhiledescribingyourinterestsandhobbies. Ideallyyoushoulddescribeahobbyorintereststhataddvaluetothejobinconsideration.Perhapsyouhaveintereststhatdriveattentiontoyourpositivesinbuildingpersonalrelationshiporyoumayhavehobbiesthatproveyouranalyticalskills. 1.38ForexampleifyouhaveappliedforSalesJobandtheemployerasksyouaboutinterestsyoumayelaborateuponyourinvolvementinyourfavoritesportteam.Thiswaytheemployerwillnotethatyouarearesultorientsperson﹣﹣﹣anaggressive/focusedplayerwhosetstoachievetargets.Justlikeanysalesannualtargets. 2.Don'tusegeneralstatementtodescribeyourhobbiessuckasMyhobbiesarelisteningtomusicwatchingtelevision.Suchananswerdistractstheattentionoftheemployerandwillnotmaketheimpressionyouwant.39. 3.Trytobalanceinlistingindividualhobbiesaswellasbeingpartofgroupactivities.40. A.Moreimportantlyinterestisthebestteacher B.Yourlifeoutsideworkmaytellalotaboutyou C.Don'ttalkabouttheactivitiesthatdistracttheirattention D.Furtheryoumaylosethechanceforkeepingtheinterestinyou E.Whatyoudoinyourfreetimemayhighlightinterestingaspectsaboutyou F.Selectthoseactivitiesthatcangiveyouanedgeoverothersasacandidate G.Mostimportantlybehonestandbackupwhateveryousayaboutyourhobbies.
设集合A={﹣10}B={t|t=y﹣xx∈A且y∈A}则A∩B=
过点31的直线l被曲线x2+y2﹣2x﹣4y=0截得的弦长为2则直线l的方程为
AsachildImadethemostimportantdecisionofmylife.Idecidedtherewasnoreasonthatmy61disablewouldpreventmefromrealizingmydreamsorstopmefrombeing62truehappywithmylife. I63placeinaspecialschooltogetherchildren64.Sufferedfromdifferentdiseases.HoweverIstudiedhardandfinallyenteredanordinaryschoolwithordinarykids65trytoenjoymylifelikeanyotherkids66myage. Itwasn'teasybutIfinallysucceededandprovedthattherewasnogoalthatIcouldn'tachieve.OverandoveragainIovercamedifficultiesand67understandthattherewasnolimittothehumanspirit. TodayIam68ownerofasuccessfulbusiness.Ihavealotoftruefriends.Itravelaroundtheworldandteachpeopletorealizetheirown69dream.Mybeliefinmylifeis70.thatthereisawillthereisaway.
假如你是学生会__李华为了推广中国传统文化学生会将举办一年一度的英语演讲比赛本年度的主题为MyFavouriteTraditionalChineseFestival请给你的英国朋友Carlie写一封邮件邮件的内容包括 1.说明你打算参加比赛及原因 2.比赛的相关内容例如时间主题等 3.希望她给予你相关的指导. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.开头和结尾已给出不计入总词数. DearCarlie Howiseverythinggoing? Lookingforwardtoyourreply. Yours Lihua.
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. ChinesepeopleoftenburytheashesoftheirlatelovedonestoshowrespectforthemonTombSweepingDaywhichnormally61fallonApril5everyyear.Itisadayforpeopletovisittheirancestor'stombsandhonorthemby62burnpaperofferings.Chinesepeopletraditionallybelievedthatsoulswillrestinpeace63theirbodiesarecoveredbysoilwhichwasconsideredmorerespectto64dead. Butattitudetowardsburialshaschanged.NowChineseare65increasingchoosingseaburialsinwhichashesaccompaniedwithflowerpetals花瓣arethrownintothesea.Oldpeopledonotcarehowthey66buryafterdeathwhattrulymattersto67theyisthehappinessoftheirchildren. Havinganenvironmentallyfriendlyburialhasbecomeimportantformanypeople.China'slatestpolicyonburialsencourageseco﹣burialsincludingseaandtreeburials68makeaharmoniousrelationshipbetweenhumans69nature.Eco﹣burialssavelandreducefuneralexpensesanddolessharm70theenvironment.
设e1.e2分别为具有公共焦点F1与F2的椭圆和双曲线的离心率P为两曲线的一个公共点且满足•=0则+的值为
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短文.短文中共有10处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. 增加在缺词处加一个漏字符号∧并在此符号下面写出该加的词. 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. Dearmanager I'mwritingtotellyouthathappenedtomeinyourdepartmentstorethedaybeforeyesterday.Igotheretobuyashirt.Ichoseoneandpaidit.HoweverwhenIgothomewithitbutIfoundthefrontpartandthebackpartwereofdifferentcolor.IwentbacktoyourstorewiththeshirtwithoutdelayhopethatIcouldhavethemchanged.Buttheshopassistantinyourstorerefusedtodothatforme.ShesaidthatIshouldhavelookedforitcarefullywhenIboughtit.NowIhavenochoosebuttowritetoyou.Ibelievethatyouwillhavetheproblemsettling. Yourssincerely LiHua.
设椭圆C1a>b>0的一个顶点与抛物线C2x2=4y的焦点重合F1F2巧分别是精圆C1的左右焦点离心率e=过椭圆C1右焦点F2的直线与椭圆C1交于AB两点. Ⅰ求椭圆C1的方程 Ⅱ是否存在直线l使得•=﹣1若存在求出l的方程若不存在说明理由 Ⅲ设点Mt0是一个动点若直线l的斜率存在且N为AB中点MN⊥AB求实数t的取值范围
Santa'sgiftbagfullofairisnolongerajokeasaCanadiancompanythatsellscrispcannedairfromtheRockyMountainshascashedinonChina'sairpollution. JusttwomonthsafterarrivinginChinaVitalityAir'sfirst500canistersweresoldout.Thenextpre﹣ordered4000canistersareexpectedtobedeliveredtothecountryintwoweekssaidCatherineQimarketingdirectorofVitalityAirChina.VitalityAirsaiditsproductsaresoldprimarilytohigh﹣endclubsnightclubsandinternationalschoolsinChina. TheairisharvestedfromtheRockyMountainsandisavailableintwovarieties﹣BanffandLakeLouise.Thepriceis129yuan﹩19.95percanisterQitoldChinaDaily.OurproductssellnotonlyinChinabutalsootherplacesincludingtheMiddleEastandIndiashesaid.TheproductoriginatedwithapracticaljokeinwhichVitalityAirfounderMosesLamputaplasticbagoffreshaironeBaywithapricetagof99UScents.Itsoldquickly.Thenextbagoffreshairwasauctioned拍卖at﹩168andalsowassold.ThenLamrealizedthedemandforqualityconvenientandfreshairbypeoplewhohavestayedindoorsforalongtime.Eachcanisterof7.7literswillsupply150doses.TheproductisavailableatTaobaoanonlinemarketplacerunbyAlibabaGroupHoldingandatVitalityAir'swebsitesaidQi. ZhangNaxinarespiratoryphysician呼吸内科医生inTianjintoldDailyNewsthat150dosesofCanadianairwon'tmakemuchofadifference.Apersonbreathes20timesonaverageperminuteandonebottlewouldlastforlessthaneightminutes. TinaWangamanageratalogisticscompanyinChinasaidshewasintriguedbytheproduct.I'vehadthefluthisweekandthebadairheredoesn'thelpmegetbetter.ThisbottleoffreshairisjustwhatIneedsaidWangwhoaddedthatshethoughtthepricewastoohigh. 28.WhydidVitalityAirdecidetosellair? A.Itbeganwithajoke B.Itforesawthemarket C.Itwantedtomakeanewproduct D.ItdecidedtoreduceChina'spollution 29.Wherecanyoubuytheair? A.Inastore B.Online C.Inthemarket D.Taobao 30.Howmuchshouldtwocanisterscostyou? A.﹩19.95 B.﹩39.9 C.﹩99 D.﹩129 31.What'sTina'sattitudetowardstheproduct? A.Surprised B.Doubtful C.Supportive D.Curious.
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