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如图，在△ABC中，CD平分∠ACB交AB于点D，过点D作DE∥BC交AC于点E．若∠A＝54°，∠B＝48°，则∠CDE的大小为（ ）
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如图所示在△ABC中∠ABC和∠ACB的平分线交于点O.过点O.作EF∥BC交AB于E.交AC于F.
如图BO平分∠ABCCO平分∠ACB过点O.作MN∥BC分别交ABAC于点M.N.若AB=12△AM
如图在△ABC中∠ABC与∠ACB的平分线交于点O.过点O.作DE∥BC分别交AB.AC于点D.E.
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.如图在△ABC中AB=4AC=6∠ABC和∠ACB的平分线交于O.点过点O.作BC的平行线交AB于
如图△ABC中AB=6cmAC=5cmBC=4cm∠ABC与∠ACB的平分线相交于点O.过点O.作D
1如图1在△ABC中∠ABC的平分线BF交AC于F.过点F.作DF∥BC求证BD=DF.2如图2在△
如图BO平分∠ABCCO平分∠ACB过点O.作MN∥BC分别交ABAC于点M.N.若AB=12△AM
已知在△ABC中AC=BC∠ACB=90°点D.是AB的中点点E.是AB边上一点.1过点B.作BF⊥
如图所示在△ABC中∠ABC和∠ACB的平分线交于点O.过O.点作EF∥BC交AB于E.交AC于F
如图在⊿ABC中∠ABC和∠ACB的平分线交于点O.过O.点作EF∥BC交AB于E.交AC于F.BE
如图在△ABC中∠C.=90°∠ABC的平分线交AC于点E.过点E.作BE的垂线交AB于点F.⊙O.
如图13△ABC内接于⊙O.且AB为⊙O.的直径∠ACB的平分线交⊙O.于点D.过点D.作⊙O.的切
如图在△ABC中CD平分∠ACB交AB于点D.过点D.作DE∥BC交AC于点E.若∠
=54°，∠
=48°，则∠CDE的大小为（ ）
A.44°B.40°
39°
38°
如图1－29所示在△ABC中∠ACB＝90°CD⊥AB于点D.点E.在AC上.CE＝BC过点E.作A
如图1在△ABC中∠ABC的平分线BF与∠ACB的平分线CF相交于F过点F作DE∥BC交直线AB于点
BD﹣CE=DE
BD+CE=DE
CE﹣DE=BD
无法判断
如图在△ABC中∠ABC和∠ACB的平分线交于点E.过点E.作MN∥BC交AB于M.交AC于N.若B
如图在Rt△ABC中CM平分∠ACB交AB于点M.过点M.作MN∥BC交AC于点N.且MN平分∠AM
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如图在△ABC中∠ACB=90°CD⊥AB于点D.点E.在AC上CE=BC过点E.作AC的垂线交CD
如图∠ABC的平分线BF与△ABC中∠ACB的相邻外角∠ACG的平分线CF相交于点F.过F.作DF∥
如图在△ABC中∠ABC和∠ACB的平分线交于点E.过点E.作MN∥BC交AB于M.交AC于N.若B
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回答下列问题 1某原子结构示意图和在周期表中的信息如图1．则该元素的质子数为该元素属于选填“金属”或“非金属”元素它在化合物中的化合价为． 2如图2形象地表示了某化学反应前后分子的变化．其中“”表示氧原子“”表示碳原子．该反应的化学方程式为．
8分Scientistshavebeenstudyinghowpeopleusemoneyforlong.Nowthey'refindingsometheoriesmayapplytoonegroupofmonkeys. Researchersrecentlytaughtsixmonkeyshostousemoney.Theygavethemonkeyssmallmetaldisks圆片thatcouldbeusedlikecashandshowedthemsomeyummyapplepieces.Themonkeyssoonfiguredoutthatiftyeygaveoneofthediskstoascientistthey'dreceiveapieceofappleinreturn. Ifyouthinkthatisallthemonkeyscanfigureoutyouarewrong.TworesearchersJakeandAllisonactedasapplesellersintheexperiments.Themonkeysweretestedoneatatimeandhad＝12diskstospendineachexperiment.JakealwaysshowedthemonkeysonapplepiecewhileAllisonalwaysshowedtwopieces.Butthat'snotnecessarilywhattheygavethemonkeys.Thenumberofapplepiecesgivenforadiskwasdeterminedatrandom. ExperimentOneAllisonshowedtwopiecesofapplesbutgavebothpieceonlyhalfthetime.Theotherhalfshetookonepieceawayandgavethemonkeyjusttheremainingpiece.Jakeontheotherhandalwaysgaveexactlywhatheshowedonepieceforeachdisk.ThemonkeyschosetotrademorewithAllison. ExperimentTwoAllisoncontinuedtosometimesgavetwopiecesandsometimesonepiece.ButnowhalfthetimeJakegavetheoneapplepiecehewasshowingandhalfthetimeheaddedabonus.Guesswhat?ThemonkeyschosetotrademorewithJake. InthefirstexperimentthemonkeyscorrectlyfiguredoutthatiftheytradedwithAllisonthey'dendupwithmoretreats.InthesecondonewhenamonkeyreceivedtwopiecesfromJakeitseemedlikeagain.WhenAllisongavethemonkeyonlyonepieceinsteadofthetwosheshoweditseemedlikealoss.ThemonkeyspreferredtradingwithJakebecausethey'drathertakeachanceofseemingtowinthanseemingtolose. Wealsosometimesmakesillybusinessdecisionsjusttoavoidthefeelingthatwe'regettinglessevenwhenwe'renot.Wouldyouhavemadethesamechoices? 1Whatconclusionmightexpertsdrawfromthefirstexperiment? A.Peoplearesmarterintermsoffinance. B.It'seasytoteachmonkeyshowtotrade. C.Businesstheoriescanapplytoallmonkeys. D.Themonkeysshowcertainbusinesssense. 2Whatdoesabonusinparagraph5referto? A.Acoin. B.Achance. C.Ametaldisk. D.Anapplepiece. 3WhydidthemonkeyschoosetotrademorewithJakeinthesecondexperiment? A.Becausetheydidn'tlikethefeelingoflosing. B.BecausetheygetmoreapplepiecesfromJake. C.BecauseJakealwaysgavethemtwoapplepieces. D.BecausetheapplepiecesfromJakewereyummy. 4Whatcouldbethebesttitleforthepassage? A.DiskforAppleWhotoTradewith? B.ShoppingforBargainSameofdifferent? C.Moneky'sBusinessSenseSmartorSilly? D.People'sBusinessDecisionLoseorGain?
下列实验方案不合理的是
15分BornonJune121929AnneFrankwasaGerman﹣Jewishteenager1wasforcedtogointohidingduringtheHolocaust大屠杀.Sheandherfamilyalongwithfourothers2spendovertwoyearsduringWorldWarⅡ3hideinanotherpartofroomsaboveherfather'sofficeinAmsterdam. Sinceitwasfirstpublishedin1947AnneFrank'sdiaryhasbecomeoneofthe4powerfulmemoirs回忆录oftheHolocaust.5itmessageofcourageandhopeinthefaceofdifficultyhasreachedmillions.Thediaryhasbeentranslatedintomorethan60languageswithover30millioncopies6sell.AnneFrank'sstoryisespecially7meaningtoyoungpeopletoday.Formanysheistheirfirstexposure接触tothehistoryoftheHolocaust. AfterbeingreportedtotheNazisAnneherfamilyand8otherslivingwiththemwerearrested逮捕andsenttoNaziconcentrationcamps.InMarchof1945several9monthaftershewasarrestedAnneFrankdied.Shewasfifteenyearsold. Hercourageandlegacyliveonandsheisfrequentlyregarded10arolemodelfortod
10分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. ManystudentsgotoInternetbarsplayvideogamesthattakesmuchoftheirprecioustime.SomestudentsevenstayedinInternetbarsdayandnightforgottheirstudies.Nodoubtthesestudentswillfinallyendupwiththeirbrightfuturedestroy.Furthermoresomestudentsvisitunhealthilywebsitesbyaccidents.Andtheyarefinallyabsorbedtotheexcitementofreadingunhealthystoriesorwatchingdirtyvideos.AlltheseareharmfultotheteenagersandifonlythisisnotcontrolledortheuseoftheInternetisnotproperlyguidedsomeofuswillgothewrongway.
6分STOCKHOLMMarch11Xinhua﹣﹣AlthoughstillcoldintheNordicinearlyspringSwedishkidscouldn'twaittogoforoutdooractivitiesintheearlyspring. OnSaturdayoutdoorclubsandexhibitorsbroughttheirnewproductstotheSwedishOutdoorShow2017inStockholmandencouragedkidstoplayandjointheiractivities. ThisisgoldpanningthatwedointhemiddlepartofSwedenasmalltowncalledKopparberg.ItisaniceactivityforchildrenforadultsjusttobeoutinthenatureandseethelovelynaturethatwehaveinSwedenandmaybefindsomegoldexhibitorUllaKalander﹣KarlssontoldXinhua.TheyhaveseentheprogramontelevisioncalledGoldRushthatcomesfromCanada.Somanypeopleareinterestedingoldpanningtheywanttoberich.Butyoudonotberichyoujustberichofseeingthenaturesheadded. ApartfromtraditionalactivitieslikekayakingandclimbingdivingisanotherfavoriteoutdoorsportsfortheSwedes. Stockholmissurroundedbylakesandeveryoneisreallygoingintolakesanddivingswimmingetc.KidsaretaughttoswimalreadyinschoolsoeverySwedishkidcanswimandgoingfromthereintodivingiseasyofcourseexhibitorAndersHolmbergtoldXinhua. Thethree﹣daySwedishOutdoorShowlastsuntilSundayandisexpectedtobringabout30000activeoutdoorpeoplewithdifferentinterestsandlevelsofexperience. 1HoldingSwedishOutdoorShowisto. A.makesomepeoplebecomerich B.makeaprofitfortheorganization. C.getmorepeopletogetclosetonature D.makepeoplemuchstrongerinhealth 2Theunderlinedpartinthefirstparagraphprobablymeans. A.werenotwillingtogo B.hadastrongdesiretogo C.couldhavenoalternativebuttogo D.coulddecidewhethertogoornot 3TheAuthor'spurposeofwritingthepassageisto. Ainform B.entertain C.persuade D.describe
25分假如你是李华你的英国笔友Peter即将完成学业不久前来信就是否到中国工作询问你的意见.请根据以下提示回一封电子邮件 1建议他来中国 2阐述你的理由就业机会多所学专业受欢迎不同的文化体验等 3承诺可提供帮助. 参考词汇专业major 注意 1词数100～120 2文章开头和结尾已给出不计入总词数 3可适当增加细节以使行文连贯. DearPete I'mverygladtohavereceivedtheletteryousentmelastweek. Bestwishes. Yours LiHua.
某校化学兴趣小组学习了气体的制取和收集后对相关知识进行总结请你一起参与并完成下面内容 1写出下列仪器名称ab． 2请写出装置A制取氧气化学方程式．若用E装置收集氧气则氧气应从口通入填“c”或“d” 3装置BC都可用来制取二氧化碳装置C相对于装置B在操作方面的优势是． 4加热碳酸氢钠NaHCO3固体来制取CO2应选用的发生装置为若用F收集CO2并测量生成的CO2气体的体积其中在水面上放一层植物油目的是植物油上方原有的空气对实验结果填“有”或“无”明显影响．
10分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仅限一词 2.只允许修改10处多者从第11处起不计分. Onasnowywinternightabuswith45passengerhadanaccidentbecauseofthewetroad.Andallofthemweretrappinginthebusandwhatwasworsethebusranoutgasanditwasverycoldinit.Theycoulddonothingbuttowait.Amanlivednearbysawwhathadhappened.Heandsomevillagersmanagedtoopenthedoorandhelpedallofthemoutofabus.Thenhetookustohishomebutofferedfoodandwaterandevensomewarmclothestothechildren.Theyspenttwodaysinhishomeandhelpcamefinal.Allofthemarethankfultohimforwhathedid.
8分TodayismyfirstdayatMerchistonCastleSchoolandIwasreallynervousaboutitbecauseIhavenevervisitedtheschoolbeforeanddidn'ttakeanysummercourse.DespitemyanxietyIsoonrelaxedonceIarrivedthestaffweresonicethatIfeltmyspokenEnglishwasbetterthanitactuallywas!AssoonasIwalkedintothedayroomofmyboardinghouseIwasabsolutely完全地amazedbythefriendlyatmosphereeveryonewassofriendlythataboyasshyasIhadnodifficultyinsettinginandImademanynewfriendsonmyveryfirstdayalthoughIwasstrugglingtorememberallthenames. AlsoIrealizedtherewereotherinternationalstudentsinthehousefromallovertheworldsuchasSouthKoreaJapanandRussia.AlthoughtheirEnglishwasnotsofluentitdidn'ttakelongforustounderstandeachotheratall.InsomewaysitwasevenbettertopracticeEnglishbyspeakingtotheinternationalstudentsbecausewewerebothlearning. AsaboarderthequalityoffoodissomethingIconsiderveryimportantandMerchistonhasnotletmedown.Theschoolkitchensarerunbyaprofessionalcateringcompanyandthequalityoffoodisexcellent.Alsotheytaketheissueofahealthydietreallyseriously.IrememberonceIwasaskedtotakemoresaladformymealbyamemberofthekitchenstaffforIdidnothaveenoughvegetables.Thisbringstoanotherpointofbeingaboarderyouneedtolearnhowtolookafteryourselfandberesponsibleforyourself.Oneofthehugeadvantagesofbeingaboarderisthatwecanhavebreakfastintheschoolwhichmeanswedon'thavetopullourselvesoutofthebedasearlyasthedaypupils! 1WhywasthewriternervouswhenhewasatMerchistonCastleSchoolonthefirstday? A.Becausehehadnofriendsandrelativesthere. B.Becausehedidn'tknowtheschoolwell. C.BecausehewasnotgoodatEnglish. D.Becausehewasshy. 2Onthefirstday. A.thoughthewriterwasanxioushesoonrelaxed B.hefoundthedayroomofhisboardinghouseterrible C.hemademanynewfriendsbuthedidn'trememberanyoftheirnames D.hethoughthespokeEnglishbetterthanthestaffintheschool 3WhichofthefollowingisWRONGaccordingtothepassage? A.IntheboardinghousethereareonlystudentsfromSouthKoreaJapanandRussia. B.Theinternationalstudentsintheboardinghousedon'tspeakEnglishveryfluently. C.ThefoodinMerchistondoesn'tmakethewriterdisappointed. D.Theprofessionalcateringcompanythinkstheissueofahealthydietveryimportant. 4Theunderlinedwordboarderinthelastparagraphmeans. A.astudentwhoisfromabroad B.astudentwholivesatschool C.astudentwhoisgoodatEnglish D.astudentwhousedtobeshy
10分1Therewerefewpeopleontheearthandnaturalresourcesseemedtobeunlimited.Todaythingsaredifferent.Theworldhasbecometoocrowded.Weareusingupourresourcestooquicklyandatthesametimewearepollutingourenvironmentwithdangerouschemicals2. Everyonerealizestodayiftoomanyfisharetakenfromtheseatherewillsoonbenoneleft.Yetwithmodernfishingmethodsmoreandmorefisharecaught.Weknowthatiftoomanytreesarecutdownforestswilldisappearandnothingwillgrowintheland.Yetwecontinuetousebiggerandmorepowerfulmachinestocutdownmoreandmoretrees.3Howeverinmostcountrieswasteproductsarestillputintoriversorintotheseaandtherearefewlawstostopthis.Weknowtoothatifthepopulationoftheworldcontinuestoriseinafewyearstherewillnotbeenoughfood. 4Ifweeatmorevegetablesandlessmeattherewillbemorefoodavailableforeveryone.Landthatisusedtogrowcropsfeedsfivetimesmorepeoplethanlandwhereanimalsarekept.5theworldpopulationwillnotrisesoquicklyifpeopleusemodernmethodsofbirthcontrol.Finallyifweeducatepeopletothinkaboutthproblemsweshallhaveabetterandcleanerplanetinthefuture. A.Whatcanwedotosolvetheseproblems? B.Soweshouldtryourbesttoprotecttheenvironment. C.Inthepastmandidn'thavetothinkabouttheprotectionofhisenvironment. D.Werealizethatiftheriversarepollutedwithwasteproductsfromfactorieswewilldie. E.Whydosomepeopledosofoolishthings? F.Ifwecontinuetodothishumanlifewon'tsurviveinthefuture. G.Outnaturalresourceswilllastlongerifwelearntorecyclethem.
8分IdecidedtoskitotheNorthPole.ItwasafterIsawanadvertisementinanewspaperlookingforpeopletojoinateamtoski350milestotheNorthPole.Backin1996therehadneverbeenawomanfromtheU.K.whohadaccomplishedthischallenge.IwonderedwhatitwouldbeliketosurviveintemperaturescoldenoughtofreezeyourfleshinsecondssoIsentofffortheapplicationform. Theapplicationformfullofpicturesofmaleexplorersarrived.ThewordsAreyoumanenoughfortheultimate极端的challenge?mademeangryandevenmoredeterminedtogetontheteam. Over500individualsappliedforaplaceintheteamandtheselectionprocessincludedphysicalandpsychologicaltestsdesignedtopickthebestgroup.InonetesttherewasahugeropeladderwehadtoclimbandIfrozeatthetopbecauseIhaveafearofheights.Ithoughtmyhopeswerefadingasmostotherapplicantssailedpastleavingmebehind.ButtwoothershelpedmeoverandlaterIfoundoutthattheorganizerswerenotlookingforamazingindividualsbutgreatteamplayersandthismomenthadshownthemwhowouldtakecareofothersintheteam. Ihadrevealed展示myweaknessandinaplaceliketheArcticyouhavetobeyourselfasthereisnowheretohide.Thesepersonalitiesofaskingforhelpandshowingweaknessarenecessaryforwomentomaster. IrealizedthatbybeingmyselfIcouldsucceed.Iwasselectedfortheteam.IrealizedthatIcouldachievemorethanIeverimagined﹣﹣﹣moreimportantlybysharingmystorywithothersIcouldinspirethemtotakeastepintothenewworldandrevealmoreoftheirabilities. 1Howdidtheauthorreactonseeingtheadvertisement? A.Shegotcross. B.Shewasdetermined. C.Shegotfrightened. D.Shewashesitating. 2Whatdidtheorganizersviewasthemostimportantintheselection? A.Personalquality. B.Individualability. C.Spiritofteamwork. D.Couragetochallenge. 3Whatdoestheauthorthinkofwomen'sshowingweakness? A.Beneficial. B.Shameful. C.Merciful. D.Disturbing. 4What'stheintentionoftheauthorinwritingthispassage? A.Toinspireustoprepareforourfuturegoal. B.Toadvisewomenhowtoturntoothers. C.Tomakesuggestionstoherteammembers. D.Toencouragepeopletoexploretheunknown.
下列化学用语与含义相符的是
下列关于实验现象的描述正确的是
30分OnewinterwhenIwaseightmyfatherandItookaridetoAuntSally'shouse.Halfwaybackhomethecar1toshakeandslowdown.Dad2thatthecarhadaflattire.Tomake3worsewewerestuckinthemiddleofasnowstorm.Icouldhearthe4inmydad'svoiceashesaidwecouldonlyuseaChristmasmiraclerightnow.IrememberhowmuchI5thatoldredcarmainlybecausetheradiodidn'twork.Actually6reallyworkedinthatcarbut7Dadgothismiracle﹣theheaterbegantooperateandwewerevery8thatwewouldn'tfreezetodeath.We9thereforsomeonetocomealongandhelpusout. Thecoldwindstartedblowingin10thelittlespaceinthedoorandthewindow.Itwhistledandmoanedand11meverymuch.FromthewindIcould12thepinetreeintheairtiedtotheroofofthecar.DadandIbothbegansearchingforsome13toclog堵塞thatthinspaceto14thecoldout.AsI15myjacketpocketIrealizedtherewasapieceoffoldedpaperinit.Ipulleditout16torealizethatitwasthewordsofthecarol颂歌Hallelujah.Ihadasudden17tosingsoIbegantosingit.Dadalso18menowandthen.BythetimeIsangHallelujahafterthesecondversethewindshad19.Aswesang…andeverybreathwedrewwasHallelujahwehearda20honk喇叭声comingfrombehindus.ItwasmyuncleMitchcomingourwaywithhelp. 1A.continued B.tended C.refused D.began 2A.wished B.realized C.doubted D.imagined 3A.conditions B.images C.things D.roads 4A.helplessness B.excitement C.sadness D.disappointment 5A.wanted B.hated C.repaired D.missed 6A.something B.anything C.nothing D.everything 7A.luckily B.expectedly C.generally D.regularly 8A.afraid B.thankful C.sure D..hopeful 9A.called B.asked C.waited D.looked 10A.through B.by C.across D.between 11A.encouraged B.loved C.surprised D.scared 12A.see B.admire C.smell D.grow 13A.way B.time C.person D.energy 14A.give B.take C.let D.keep 15A.fellinto B.reachedinto C.lookedinto D.putinto 16A.just B.even C.only D.still 17A.desire B.chance C.change D.act 18A.supported B.praised C.joined D.comforted 19A.grew B.calmed C.started D.stopped 20A.strange B.familiar C.frightening D.boring
15分TheTowerBridgeisoneofthetwenty﹣sevenbridgesovertheRiverThames.ItisclosetotheTowerofLondonfrom1theTowerBridgegotitsname.ItisasymbolofLondon. ItisrecordedthattheTowerBridge2buildin1894andnowitisoneofthe3famousbridgesintheworld.It'sinterestingthatitsmiddlepartcanberaised4letbigshipspass.Itusedtoberaisedabout50timesadaybutnowitisraisedonly4to5timesaweek.Ifyouareluckyenoughtoseethebridgewithitstwoarmsopenhighintheairyou'llneverforgetit. PeopleoftenthinktheTowerofLondonandtheTowerBridgeare5thesameage.6infacttheTowerofLondonwasbuilt1000yearsagowhilethelatteronly7haveahistoryofover100years. TheTowerBridgewasfirstpaintedchocolatebrown.Lateritwaspaintedredwhiteandblue.ItspicturealsoappearedintheopeningoftheSummerOlympicGames8holdinLondonin2012.Socometovisitthefamousbridge.You'll9surehaveawonderfulexperienceandit'llleaveyoualasting10impress.
下列有关金属的说法不正确的是
某兴趣小组用10g镁条与一定溶质质量分数的稀硫酸反应．测得产生氢气的质量与稀硫酸的质量关系如图所示假设镁条中除表面含有氧化镁外．没有其他杂质 1当所用稀硫酸的质量为70g产生的氢气的质量为 2用化学方程式说明当稀硫酸的质量为10g时为什么不产生氢气 3计算稀硫酸中溶质的质量分数
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