首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
已知椭圆E:+=1(a>b>0)的左,右焦点分别为F1,F2,过F1作垂直x轴的直线交椭圆E于A,B两点,点A在x轴上方.若|AB|=3,△ABF2的内切圆的面积为,则直线AF2的方程是( )
查看本题答案
包含此试题的试卷
高三下学期数学《》真题及答案
点击查看
你可能感兴趣的试题
设椭圆的左右焦点分别为F1F2右顶点为A上定点为B已知 设P为椭圆上异于其顶点的一点以线段
已知m>1直线x-my-m2/2=0椭圆C://x2/m2+y2=1F1F2分别为椭圆C的左右焦点.
已知椭圆中心在原点焦点在x轴上离心率点F1F2分别为椭圆的左右焦点过右焦点F2且垂直于长轴的弦长为1
已知F.1F2分别是椭圆E.:+y2=1的左右焦点F1F2关于直线x+y-2=0的对称点是圆C.的一
已知椭圆C+=1a>b>0的左右焦点分别为F1F2离心率为e.直线ly=ex+a与x轴y轴分别交于A
已知椭圆+=1的左右焦点分别为F1F2点Px0y0为椭圆上的动点当∠F1PF2为钝角时点P.的横坐标
已知椭圆的左右焦点分别为F.1F.2点P.为椭圆上一点且∠PF1F.2=30°∠PF2F.1=60°
如图已知椭圆=1a>b>0F1F2分别为椭圆的左右焦点A.为椭圆的上顶点直线AF2交椭圆于另一点B.
已知椭圆C+=1a>b>0的左右焦点分别为F1F2若椭圆C上恰好有6个不同的点P使得△F1F2P为等
如图已知F1为椭圆的左焦点A.B.分别为椭圆的右顶点和上顶点P.为椭圆上的点.若PF1⊥F1APO∥
椭圆Γ:+=1a>b>0的左右焦点分别为F.1F2焦距为2c.若直线y=x+c与椭圆Γ的一个交点满足
已知椭圆C1的方程为双曲线C2的左右焦点分别为C1的左右顶点而C2的左右顶点分别是C1的左右焦点1求
已知椭圆+=1a>b>0的左右焦点分别为F1F2短轴的两个端点为A.B.且四边形F1AF2B是边长为
如图设椭圆+=1的左右焦点分别为F1F2过焦点F1的直线交椭圆于Ax1y1Bx2y2两点若△ABF2
已知椭圆+=1a>b>0的左右焦点分别为F1-c0F2c0.若椭圆上存在点P.使得=则该椭圆的离心率
设椭圆的左右焦点分别为F1F2右顶点为A上定点为B已知 求椭圆的离心率
已知椭圆+=1的左右焦点分别为F1F2点P.在椭圆上若PF1=4则点P.到右准线的距离是.
已知椭圆+=1的左右焦点分别为F.1F.2点
在椭圆上,且|AF
2
|=6,则△AF
1
F.
2
的面积是( ) A.48
40
32
24
已知双曲线C.a>0b>0的左右焦点分别为F1F2点M.与双曲线C.的焦点不重合点M.关于F1F2的
,
,线段MN的中点在双曲线的右支上,若|AN|﹣|BN|=12,则a= A.3B.4
5
6
已知F.1F.2分别为椭圆+=10<b<10的左右焦点P.是椭圆上一点.1求|PF1|·|PF2|的
热门试题
更多
15分Asisknowntoallapositiveparent﹣childrelationshipis1benefittothephysicalandmental2growofchildrenbutkeepingahealthyparent﹣childbond3needtheeffortsofbothparties. Parentsshouldtaketheresponsibility4improvetheirrelationshipwiththechildren.Whatmattersisspendingqualitytimewiththeirchildren5tighttheirscheduleis.Forinstancetheycaneat6mealtogethergotosportingeventstogetherorwatchtheirchildren'sfavoriteTVshowstogether7cancontributegreatlytomakingtheirchildrenfeelsafeand8love. Childrenontheotherhandshouldlettheirparentsknowtheyappreciatewhattheirparents9doforthem.Ifpossibletheycangivetheirparentsagiftonaspecialdayorhelpwithhousework10aregularbasis. Isfohealthyparent﹣childrelationshipiswithoutconflict.Butaslongasparentsandchildrenmake jointefforttheycansettletheconflictandenjoytheirtimetogether.
下列元素中属于金属元素的是
课外小组的同学自制一块多槽铁板设计了如图所示装置用以探究燃烧的条件.说明金属板上白磷足量.回答下列问题 1推出可燃物燃烧需要一定温度的依据是. 2将过氧化氢溶液滴入盛有MnO2的金属槽中发生反应的化学方程式为. 3有同学提出“将NaOH换成水然后将水换成浓硫酸也可以完成探究活动”.你认为是否可行为什么.
15分KewGardensliesonthebanksoftheRiverThamesinsouthwestLondonwhich1coveralargearea. Thereisavisitorcenternearthegate2youcanpickupaguidebookforthegarden.NeartheentrancearethePalmHouseandsomehugebananatreesaswellasotherplantsfromthehotandwetpartsofAfricaandAsia.ClosetothePalmHouseisamuseumshowingmanyphotosofpeoplethroughouthistorywhohaveusedplants3makedifferentthingsfrompapertoboats. YournextstopmightbethePagodawhichlookslikea4traditionChinesetemplebuilding.Thereisabamboogarden5manyChinesebambooplantsandChinesepalmsinit.TheRoseGardenisbeautifulinsummerandtheWoodlandisanareafullofhugeredwoodtreesfromCalifornia. AvisittoKewGardensisnotcompletewithout6visitKewPalace.At7itbackisawonderfulgardenwhichcansatisfyvisitors'curiosityaboutcommonplantsthatcanbeusedasmedicines. VisitingKewGardensis8enjoyableandeducationalexperienceforpeopleofall9age.Itdoesn'tmatterwhetheryouhaveeverbeentoKewGardensornot.VisitKewGardensonce10youwillfallinlovewithit.
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县娘写的以下作文.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^并在其下面写出该加的词. 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. InChinaandWesterncountrieswhenthatcomestopigswehavereachedanagreementwhichpigsarelazyandstupid.Butthetruthisthatpigsdohavesomegoodqualities.ItwastimetocleartheirnamenowwiththearrivaloftheYearofthePiginChina.Accordingtoapaperpublishingin2017pigsarementalandsociallysimilartodogsandchimpanzees.Theyliketoplayandhavewelllong﹣termmemories.ThereareJovablepigcharactersincartoonseither.PeppaPigforexampleUKtelevisionseriesthatwasbeganin2004hasbecomeoneofthemostpopularcartoonsin180countriesandregions.ThefamilymembersofPeppaPigteachchildrenlovefriendshipandthevalueoffamily.
粗盐提纯和配制5%的食盐水都需进行的操作是
8分 Somepeoplearesorude! Whosendsane﹣mailoratextmessagethatjustsaysThankyou?Wholeavesavoicemailmessageratherthantextsyou?WhoasksforafacteasilyfoundonGoogle?Don'tthesepeoplerealizethatthey'rewastingyourtime MaybeI'mtherudeonefornotappreciatinglife'slittlepoliteness.Butmanysocialagreedstandardsjustdon'tmakesensetopeopledrowningindigitalcommunication. Intextsyoudon'thavetodeclarewhoyouareorevensayhello.E﹣mailtooisslowerthanatext.Voicemailisanowimpolitewayoftryingtoconnect. MyfatherlearnedthislessonafterleavingmeadozenvoicemailmessagesnoneofwhichIlistenedto.ExasperatedhecalledmysistertoexpresshisdissatisfactionthatIneverreturnedhisphonecalls.Whyareyouleavinghimvoicemail?mysisteraskedJusttexthim. Intheageofthesmartphonethereisnoreasontoaskonce﹣acceptablequestionsabouttheweatherforecastabusiness'sphonenumberordirectionstoahousearestaurantwhichcanbeeasilyfoundonGoogleMaps.Butpeoplestillaskthesethings.Andwhenyouanswertheyrespondwithathank﹣youe﹣mail. Howtohandlethesedifferingstandards?Easy.Consideryouraudience.Somepeopleespeciallyolderonesappreciateathank﹣youmessage.Otherslikemewantnoreply. Theanthropologist人类学家MargaretMeadoncesaidthatintraditionalsocietiestheyounglearnfromtheold.ButinmodernsocietiestheoldcanalsolearnfromtheyoungHere'shopingthatpolitenessnevergoesoutoffashionbutthattime﹣wastingformsofcommunicationdo. 1Theunderlinedwordexasperatedcanbereplacedby. A.worried B.annoyed C.surprised D.tired 2Whydidn'tthewriterreplytohisfather? A.Hedidn'treceiveanyvoicemailmessages B.Heenjoyedcheckinghisvoicemail C.Helikedtextmessagesbetter D.Hedidn'twanttotalkwithhisfather 3Whichofthefollowingdoesthewriteragreeto? A.Peopleneedn'tlearnfromoneanotherintraditionalsocieties B.Peopleneedn'tturntoGoogleforhelpwhenintrouble C.Declaringwhoyouareorsayinghellointextsisnecessary D.Dealingwithvoicemailshouldvarywitheachindividual 4What'sthebesttitleofthispassage? A.Nowadayswhatmeansshouldweuseincommunication? B.Nowadayswhatshouldwedowithtextmessages? C.Nowadaysdoyoulikeleavingothersavoicemessage? D.Nowadaysdoyouneedathank﹣youmessage?
氧是地壳中含量最多的元素已知一种氧原子原子核外含有8个质子和10个中子则该氧原子核外电子数为
treatsmadebythebelovedHostessbrand.Butaftermorethan80yearsAmericamustbidafondfarewelltothesedesserts.EarlylastweekHostessannounceditwasgoingoutofbusiness.'Manypeoplehaveworkedincrediblylongandhardtokeepthisfromhappening'saidHostessCEOGregoryF.Rayburn.'Hostesshasnootheralternativethantobegintheprocessofwindingdown.'Hostesswasfoundedin1930astheInterstateBakeriesCorporation.AsthecompanygrewitboughtthemanufacturerofWonderBreadoneofthebiggestproducts.WonderBreadwasahouseholdnameinthe1950sand1960s.OvertheyearsthesoftwhiteslicesbecameasAmericanasapplepie.InthepastdecadeshoweverHostesshasexperienceddifficultieswithitsmanagementandhighlaborcosts.Thecompanyhadmoneytroublesinthepastbutthistimetherewasnowaytorecover.Alongwiththelossofsugarytreatscomesthelossof20000jobs.ThedownfallofHostessisduenotjusttothecompany'sfinancialdifficultiesbutalsotoachangingAmerica.Ourcountry'stastesandlifestylesarenotthesameastheywereeightyyearsago.Americanshavebecomemorehealth﹣consciousandtheyaredemandingmorehealthfulfoodproducts.Asamanufacturerofhigh﹣calorieproductsHostessdoesnotfitintothisnewwayoflife.TomakemattersworseforHostessAmericansdonoteatasmuchbreadastheyoncedid.'Moreandmorewe'rechoosingone﹣dishmeals'saidHarryBalzarafoodindustryanalyst.'Thetraditionofbreadasasidedishisfading.'Americansarefindingalternativestotheirmorningtoasttoo.Insteadtheyarechoosingquicksnacksandenergybars.WillTwinkiesbecomeanimageofbygoneAmerica?Hostessfansarehopefulanothercompanywillbuyoutthemakerofthisspongysnackandsecureitsspotonsupermarketshelvesforyearstocome.Wecanonlywait.1Whatdoesthepassagemainlytalkabout?A.Americansdon'tlikebreadnow.B.Hostessisgoingtoclosedown.C.Americaischangingfast.D.Hostessbrandispreparingtosell.2WhichofthefollowingisNOTthereasonthatcausesthedownfallofHostess?A.Financialproblems.B.Hightaxcosts.C.Thechangingtaste.D.Poormanagement.3WhatmaybedirectlyaffectedifHostessgoesoutofbusiness?A.Theculturaltradition.B.Thehealthyproblems.C.Thedevelopmentofeconomy.D.Thesituationofemployment.
25分阅读下面短文根据所给情节进行续写使之构成一个完整的故事. TheysayacathasninelivesandIbelievethatsinceIamnowlivingmythirdlifeandI'mnotevenacat.Myfirstlifebeganin1904whenIwasbornintoafarmingfamily.ThoughstrugglingtomakealivingIstartedmyownfamily.ThiswaswhenIbegantoenjoymyfirstlifehappyinexcellenthealthtwolovelygirlsagoodjobandabeautifulhome.Lifewasapleasantdream.Thenitended.Ibecameaffectedwithadiseaseaffectingfirstmyrightarmandlegandthenmyotherside.Thusbeganmysecondlife… DespitemydiseaseIstilldrovetoandfromworkeachdaywiththeaidofspecialequipmentinmycar.Therewere14stepsinourhomeleadingupfromthegaragetothekitchendoorwhichweremyyardstick标准mychallengetocontinueliving.WhenonedayIwasunabletoliftonefootuponestepandthendragtheotherpainfullyafteritIcouldthenadmitdefeatandliedowntodie.SoIkeptonworkingandclimbingthosesteps.Youmightthinkthatherewalkedamanofcourageandstrength.Notso.Herecrippled跛行abitterlyfrustratedmanwhoheldontoeverything﹣clearmindwifejobandhome﹣becauseofthe14miserablesteps.AsIbecameolderIbecamemorefrustrated. ThenonadarknightinAugustIbeganmythirdlife.FiercewindsandslashingrainbeatdownonthecarasIdroveslowlydownoneoftheless﹣traveledroads.SuddenlyIheardthebangofablowout.Ifoughtthecartostopandsatthereastheseriousnessofthesituationsweptoverme.Itwasimpossibleformetochangethattire.Completelyimpossible.ThenIrememberedthatashortdistanceupalittlesideroadwasahouse.IstartedtheengineanddroveslowlyalonguntilIcametothedirtroadwhereIturnedin﹣thankfully.LightedwindowswelcomedmetothehouseandIpulledintothedrivewayandpressedthehorn. 注意 1.所续写短文的词数应为150左右 2.应使用5个以上短文中标有下划线的关键词语 3.续写部分分为两段每段的开头语已为你写好 4.续写完成后请用下划线标出你所使用的关键词语. Paragraph1 Thedooropenedandanoldmancameout. Paragraph2 InthenextfewfrozensecondsIfoundtheoldmanacripplewetthrough!
25分Inthefarawaylandtherewasabeautifulkingdomwithitsuniquerule.Therulesaideveryonemaybecomethekingwithallofhisrightstogovernthecountryforfiveyears.Afterthathemustbecaughthisbodywillbetiedandhewillbethrownawaytoaremoteislandwherethejungleisthickandthereareplentyofwildanimalsandnohuman. Thenonebyonepeoplebecametheking.ThefirstmansaidOkI'mreadytobetheking.Andhebecameakingforfiveyears.Whathedidinhisfiveyearswasenjoyinghisposition.HethrewbigpartieswenttomanybeautifulplacesmarriedmanywomencollectedmanyluxuriousthingsanddidotherthingsthatpleasedhimselfThosewereallhedidandheneverpreparedanythingforhisfuture.Untilonedaythetimecame.OnemorningwhenthekingwokeupsuddenlystrongsoldierscametohispalaceandsaidWecamehereundertheorderofconstitution.Nowit'stimeforyoutobethrownawaytotheremoteisland.Thekingwasn'tsurprisedbuthefeltthattimepassedbytoofast.Hehadenjoyedhimselfinthepastfiveyearsbutnowhehadtoaccepthisdestinywithtearsinhiseyes.Thesoldierssenthimtothedangerousislandandleft.Alltheyheardwasthevoicesofthewildanimalsandthelongscreamoftheformerkingandthensilentagain. Everyotherkingwasthesameuntilayoungmancameanddeclarehiswish.Bytheconstitutionhewasgrantedhiswish.Hewouldbeahugforfiveyearsbeforebeingthrownawaytotheisland.Butifotherkingswouldfollowtheirpassionforhavingfunhedidn't.Thekingwasalwaysseentobethinking. 注意1所续写短文的词数应为150左右. 2应使用5个以上短文中标有下划线的关键词语. 3续写部分分为两段每段的开头语已为你写好 4续写完成后请用下划线标出你所使用的关键词语. Paragraph1 Andnotverylongafterthathemadeasurprisingdecision. Paragraph2 Finallythetimecamewhenthekinghadtobethrownawaytotheisland.
25分AfterstudyforhoursIwentoutsideanduptotheroofnearbyforabreakandwatchedpeopleswimminginthesea.Itwasasunnyday﹣abluecloudlessskyoveracalmsea.ButthenasIlookedinthedistance.Idiscoveredaseriesofthreeorfourbigwavesheadingtowardstheshore.I'dseenthesemini﹣tsunamis小型海啸manytimesbefore.Theywereheadingatspeedinthedirectionoftheswimmingarea.MostpeopleknewtolookoutforthembutfromthescreamsthatstartedcomingfromthebeachIcouldtellsomeonewasintrouble. WithoutthinkingIrandownintothestreetholdingmybodyboard冲浪板onthewayandshoutedatastrangertocallthecoastguard海岸警卫.MyneighborTomhadheardthescreamingaswellandwasalsooutsidewithhisbodyboardsotogetlierwerushedtothestepsthatleddowntothesea. Oncewegotcloserwediscoveredthewaveshadpulledabovandagirlintotheopensea.Iknewthatthenearestboatwouldtakeatleast30minutestoreachus.Iwasn'tusedtothissortofemergency﹣I'dneverbeentrainedasalifeguard﹣butIdidn'tthinktwiceabouttryingtosavethem. IsupposeinawayIwantedtoimpresseveryoneat19adeallikethatcanseemlikeagoodopportunitytoshowoff. TomandIdivedintothewaterandittookus10minutestogettothem.Whenwefinallyreachedthemtheywerealmostlifelesswithonlytheirheadscominginandoutofthewater.Wecouldtelltheywerestillalivefromtheirsmallbreathsbutitwascleartheywouldn'thavebeenabletostaytheremuchlonger.Iheldtheboyandpulledhimovermyboard.Tomthenmovedthegirlontohisboard. Paragraph1 Wediscussedpushingthembacktotheshorebutweweretoofarout. Paragraph2 Thatnightwordcamefromthehospitalthatthetwokidswereingoodcondition.
下列物质性质的表述中属于化学性质的是
15分Whereveryoulookthesedayssomething'slookingbackatyou.Therearevideocamerasonstreet1cornervehiclesandourownfrontdoors. AChicagocompany2callCoolerScreensbelievesthatyouwon'tmindiftheyputcamerasintothedisplaycases展柜instores.Thecamerasaren'tplacedthere3preventyoufromstealing.Insteadtheyrepartofasystemthattriestoguess4youwillbuynextbasedonhowyoulook. Thedoorsonthecases5bevideoscreensthatshowimagesofthegoodssoacustomercanseewhat'savailableinside.Thescreensalsoshowvividads.Theydecidewhichadstoshowby6studyvideoimagesofthecustomers. Acamerafeedsimagesofeachcustomerintoacomputer7guesseshisorhersexandage.Inadditionthesystemtracks8exactwherethecustomerislooking.Dotheeyescometorest9abottleofRedBullordoestheshopperfancyCocaCola?TheCoolerScreenssysteminstantly10analyzeallofthisdataandthenstartsshowingadsonthecoolerdoor.
40%的甲醛HCHO溶液被称为__用于生物标本保存.工业上可用甲醇CH3OH氧化得到其生产过程如图1所示 回答下列问题 1碱洗池内发生反应的化学方程式为. 2氧化室中发生反应的微观过程如图2.请在空白□内画出生成物使该反应的微观过程完整. 3蒸馏室中发生的变化属于填“物理变化”“化学变化”. 4生产50吨__其中含有甲醛吨.
“沸石分子筛”能将氮气等分子吸附是家用制氧机的关键部件.通过控制按钮利用变压吸附技术获得不同浓度的富氧空气图1为该制氧过程的示意图. 1请在图1中画出通过分子筛前后气体主要组成成分的微观示意图.已知气体的体积比等于微粒个数比说明用〇表示氧原子用●表示氮原子. 2欲收集一瓶图1所示的富氧空气用于检验氧气的含量你认为合适的收集方法是理由是. 3用图2所示装置测定富氧空气中氧气的含量你认为一定能引起误差的原因是.
下列物质在氧气中燃烧产生大量白烟的是
8分Beneathasanddune沙丘inBeidaiheliesoneofChina'snewestartgalleriesAsabranchoftheUllensCentreforContemporaryArtinBeijingtheDuneisunlikeanyotheradvancedartmuseuminChina.Mostareremarkablebuildingsstandinginthedowntown.ButtheDuneisquietandprivateitsgalleriesspreadingagainstthesands. HarmonywiththelandscapeandthelocalcommunityisattheheartoftheDune'spurposeItaimstobesustainable可持续的ecologicallyaswellasfinanciallyandtohelpprotecttheenvironmentratherthandestroyingit.Ourworkwasnotjusttodesignaphysicalstructure'saysLiHuadesigneroftheprojectbuttoinventanentirelynewtypeofsystem. Insteadofplacingthemuseumontopofthedunesaswasoriginallyplannedhedecidedtoburythebuildingbeneaththemtoprotectthecoastalecology. Becausethemuseumislitnaturallybyskylightsvisitors'experiencesoftheartworkwillvarywiththeseasonsandtimeofday. TheDune'sinnerpartsaremeanttodevelopacloserelationshipbetweenviewerworkandspace.GoingtoamuseuminChinaoftenfeelslikegoingtoashoppingcentersaysMr.LiIt'sanexperienceofrushedconsumerism消费主义.BycontrasttheDuneremindsviewersofthecaveswherethemostprimitivehumanartwasfirstpainted.ThedesignwasinspiredbyLouisKahnanAmericanarchitectwhoimaginedmuseumsasasocietyofroomswhichencouragepeopletoslowdown.Giventheseparatelocationvisitorswillhavetomakeasincerepilgrimage朝圣totheartasMr.Liputsitratherthanjustahurriedurbanfly﹣by. 1What'sthecharacteroftheDuneinParagraph1? A.It'snoisy B.It'sinthedowntown C.It'sthemostadvancedartmuseum D.It'sburiedbeneathadune 2What'sParagraph2manlyabout? A.theartworksoftheDune B.thepurposeoftheDune C.theside﹣effectsoftheDune D.theoriginoftheDune 3Theauthorwritesthispassage. A.tocomparetheDunewithotherartmuseums B.tocriticizeadvancedartmuseums C.tointroducetheDunetoreaders D.topraiseLiHu'scontributionstotheDune 4Wecanlearnfromthepassagethat. A.theDunewasplannedtobeplacedbeneaththedunesinthebeginning B.viewerscanvisittheDuneanytimeintheday C.visitingamuseuminChinaissincerePigrimagetotheart D.theDunemakesviewersthinkofthecaveswiththemostprimitivehumanart
10分 Howtobecomeamorethankfulperson Inthebusinessofday﹣to﹣daylifeweoftenforgettostopandbegratefulforthepresentmoment.Beinggratefulisimportantandhasmanymentalandphysicalbenefits.Ifyouwanttoworkonbeingmoregratefultryshiftingyourfocusthroughouttheday.Workonpracticingmindfulnesswhichcanhelpyouappreciatethepresentmoment.1 Begratefulthroughouttheday. Givethankseachmorning.Ifyouwanttoworkonbeingamorethankfulpersonworkonsettingthetoneforgratitudewhenyouwakeup.2Takeamomenttobethankfulfortheabilitytoliveanotherday. Takeafewmomentstolookatthebigpictureaswell.3Howeveryouhavearoofoveryourhead.Yourjobmaynotbepartofyour10﹣yearplanbutyouhavemoneycominginandasenseofpurposeeachday. Expressyourgratitude Expressingyourappreciationcanmakeyourselfandothersmoreawareofit.4Expressinggratitudedoesnothavetobeabigsweepinggesture.Sendsomeoneaquicktextmessagetothankthemforlisteningtoyouandtalkingoveraproblemtheothernight.Leaveanoteinyouroffice'skitchenthankingsomeoneforalwaysrememberingtobringinfreshcoffee. 5 Beslowatappreciatingslighthappinessandtrytoenjoytheaftertaste.Takefivesecondstocloseyoureyesandrememberthesmellofcoffeeasyousitatyourdesk.Smileasyourememberyourco﹣worker'spraise.Don'tjustobservethegood.Workactivelytoembraceit. A.Enjoysmallpleasures. B.Gratitudeisgoodforyou. C.Pausebeforegettingoutofbed. D.Keeptheshortnessoflifeinmind. E.Youmaynothavethebestapartmentintheworld. F.Trytotalkaboutyoursenseofgratitudethroughouttheday. G.Youshouldalsofindabalanceallowingyourselftofeelgrateful.
碳酸钠和碳酸氢钠是生活中常见的盐课外小组通过以下实验进行鉴别. 实验1 实验2 实验3 回答下列问题 1实验1中控制的变量是实验1得出的结论是. 2实验2的目的是. 3①实验3﹣2中观察到的现象是. ②完全分解8.4gNaHCO3能生成CO2g. ③要确定碳酸氢钠的分解产物还需进行的实验是.
30分5pmma'am.What?Mybabycannolongerwaitforthat!Canyoupleaseaskthecrewafavortomakeit1?My3﹣month﹣old﹣babywasalreadyvery2Hisstomachbecamelargerandlargerineachhourthat3. Threedaysagowebroughthimtothe4whereIworkedseveralvomiting呕吐.Iknewthedangerverywellbecausetherewerealready5patientsofthiscasethatwehadencountered.ButitwasnotassimpleasI6Itheldabiggerunknownthreatthatneeded7surgery.Butbeforethedoctorcouldfigureoutthebest8heorderedaCTScanoftheWholeStomach.Itwasscheduledatthemostfamoushospitalofthecity9ourownhospitaldidn'thaveityet. Everythingabouthimsuddenlybecamesounstable.Iknewthathischanceof10becameverythin.SoIwasafraidthathecouldn'twaitforanotherfewhours. Ma'amwe'resoblessed.His11ismovedto3pm. Iwas12butanothermuchbiggerproblem13Ididnothavethemoneyneeded.Ihadtosendmessageswithmy14toborrowmoneytothepersonsinmycontactlist.Ionlyhadfewminutesleftthen.Icriedwhile15amiracletoprovidemewaysrightthen.As16asIgotupfrommykneesmycellphonesuddenlyrang17.Ms.Luceropleaseclaimyourmoneythrough…AndoneafteranotherI18differentmessagestellingmetogetthemoneytheysentformybaby.Ihadthemoneytheninlessthananhour!NotonlyfortheCTScanbutforourimmediateneedsduringourwholehospitalstay! Iwassoawed敬畏的athowdestiny命运19alltheincidentsin.livestocomeupforblessingsthatithaspreparedaheadofus!Butmostofallforthe20signthatHehasshownmethatmybabyshalllive! 1A.later B.longer C.earlier D.shorter 2A.weak B.thin C.strong D.healthy 3A.passedaway B.passedby C.passedon D.passeddown 4A.school B.company C.hospital D.government 5A.meaningless B.valueless C.homeless D.countless 6A.made B.expected C.provided D.felt 7A.fast B.simple C.slow D.immediate 8A.approach B.thing C.tool D.hospital 9A.since B.before C.or D.and 10A.arrival B.survival C.death D.danger 11A.surgery B.result C.recovery D.schedule 12A.nervous B.relieved C.worried D.embarrassed 13A.rose B.raised C.arose D.aroused 14A.request B.command C.suggestion D.order 15A.playingwith B.lookingfor C.prayingfor D.givingup 16A.far B.well C.long D.soon 17A.quietly B.totally C.hardly D.continuously 18A.accepted B.received C.wrote D.sent 19A.found B.built C.arranged D.damaged 20A.first B.second C.third D.fourth
15分假设你是学校的学生会__李华一批来自英国的高中生与你校的高中生开展了为期两周的交流项目.现在他们即将回国你将在欢送会上致辞.请根据以下提示写一篇发言稿. 1.回顾双方的交流项目如学习生活文艺等方面 2.谈谈收获 3.表达祝愿. 注意 1.词数80左右 2.可适当增加细节以使行文连贯.
10分WhenIheardthepianoIwalkedtoMrs.Windsor'shouseandwaitedoutsideasIalwaysdid.ThatmeantshewasworkingwithanotherstudentandIwasnotsupposedtobotherthembyringingthebell.IstoodagainstthewallanddaydreamedwhatI'dratherbedoing.AlmostanythingIsigheddejectedly.IhadbeentutoredenoughtoreadunderstandandevenwritesomemusicalcompositionsbutIjustdidn'thaveagiftforit.Itdidn'tcometomenaturally.IthoughtbacktohappiertimeswhenIwaswritingstoriesandactingthemoutwithmyfriendscuttingupoldclothestomakedressesthatperformerswearinplaysandbuildingsceneryoutofoldthingswefound.ButMrs.WindsorhadofferedtogivemethelessonsforfreesoIfeltmydutytotry. ThedooropenedandWendyBartoncameout.Iwalkedinsatdownonthepianobenchandbegantosortthroughmysheetmusic. HelloIheardavoicebehindmesaysoftlyIturnedaroundtoseealittlegirlstandingbehindmeeatinganapple.ButbeforeIcouldmakeanyresponseMrs.WindsorwalkedintotheroominherusualurgentmannerandannouncedJenniferthisismyniecePasha.PashathisisJennifer.Pashawillbegivingyouyourlessontoday.I'muptomyearsinsomethingelse!shethenexitedtothekitchen. Pashasetherappledownonthesidetableandslidbesidemeonthepianobench. Whatpiecedoyoulikebest?sheasked. Whatdoyoumean?Iasked.They'reallthesametome.Idon'tknow. Youmeanyoudon'thaveafavorite? Nonotreally. Pashalookedatmeratherpuzzledthenopenedmysheetmusictothebeginningpageandaskedmetoplay.Iarrangedmyfingersonthekeysandstudiedthenotesonthepageforamoment.ThenIfrownedandconcentratedtomakethenotesonthepagematchthefingermovementsIhavetoadmitIwasarathermechanicalpianist. AfteraboutapageortwoPashagentlyputherhandontopofmineasiftocalmmyfingers.Therewasalongpause.Whatareyouhearinginthemusic?IlookedatherratherstrangelyandadmittedIdidn'tknowwhatshemeant. Likeastory.Whatstoryisbeingplayingoutwithinthemusic? IguessI'veneverthoughtaboutitbefore.Idon'tknow. HereletmetryandyoulistenPashaadvised. Sheclosedhereyesandtookadeepbreathlettingherfingersdancelightlyoverthekeys.Thenshebegantoplay.Seeitbeginsherebesidesomekindofriver.Hearthewaterflowingbesideyou? Herfingersroseandfellgentlyonthekeys.Nowtheprincessappearsandshe'spickingflowersfromthewater'sedge.AcarefreehappypieceofmusicfilledtheairintimetoPasha'sdancingfingers.Ohbutsheslips!Themusicchanged.Andourprincessisbeingcarriedoffbythefast﹣flowingstream.Quicklytheprincess'shorseseesherplight因境Pashacontinuedandracestotheriver'sedgewhereheswimsouttolethercatchholdofhim.Theymakeittothebankandshehugsherfaithfulhorseandswearsshewillneveragainwearprincessskirtsthatweighherdown.ShewillonlywearjeansandT﹣shirtfromnowon.Pashafinishedwithabigsmileandthenlookedatme. Aren'tyouthegirlwhotellsthestories?sheasked. Iguess.Idotellalotofstories. Ohyes!Allthekidstalkaboutthem.I'veheardaboutyou.Wellallyouhavetodoislearntohearthestoriesinthemusic.That'sallthereistoit. I'veneverthoughtitthatway. Let'stryanotheroneshallwe?Pashasmiledandtogetherweplayedthatafternoonfindingthestoriesinthemusicandlearningthatsometimesittakesafriendtopullyououtoftheriverontodrylandagain. 1Jennifergotlostinthoughtwhenshe. A.playedthepianowithPashaforthefirsttime B.listenedtoPashatellherstoryabouttheprincess C.rememberedhappiertimesofwritingstoriesandactingthemout D.discoveredthatMrs.Windsor'sniecewouldbegivingthepianolesson 2WhichofthefollowingcanbestdescribePasha? A.Creative B.Naughty C.Humorous D.Brave 3Whichofthefollowingisthehesttitleforthetext? A.NeverGiveup B.APianoLesson C.WhyIHatedPlayingthePiano D.AFriendforEver 4Thistextwouldbeprobablyfoundin. A.acollectionofstoriesaboutfriendshipandlearning B.abookofdailyrecordsaboutfamousyoungmusicians C.amagazineseriesaboutthechallengesofovercomingfears D.aseriesofnewspaperarticlesaboutmusicalinstruments
钢铁被称为工业的骨骼. 1工业上炼铁的化学方程式为. 2钢铁在生产生活中可用于举一例.
10分 Howtoenjoyschool Schoolisagreatplacewhereyouarealwaysoccupiedinexpandingyourknowledgeandfurtherimprovingyourself.ButSchooldoesn'thavetobeaprison.1Learnsomeconcretestrategiestohelpyouenjoyyourschoollifemakingfriendsandkeepingitfun. Cheeryourselfupeachday.YoucouldwakeupeachmorningwithabadattitudeandeachCorningwillturnintoabadday.Oryoucouldlistentosomeenergetictuneseatabreakfasttoyourtasteandmakeyourschooldaypleasant.2 3Ifitmakesyouhappierandmorecomfortablewithyourenvironmenttrydecoratingyourschoolbagsnotebooklockerandothersuppliesnecessary'forschool.Usestickerscolorfulpens°rotherstufftomakeyourschoolthingsalittlemorefuntocarryaroundwithyou. Joinanafterschoolclub.Ifsagreatwaytomakefriendsbyjoiningaformalcluborgroupatyourschool.4Checkouttheoptionsofferedatyourschoolandconsiderjoiningonethatlinesupwithyourhobbies. Avoiddistractions.5Butitalsorisksgettingyouintotroubleandforcingyoutofallbehindwhenyou'renotpayingattention.Itmaynotseemlikeitbutthebestwaytoenjoythelessonsistolistenmorecloselynotfindwaystodistractyourself. A.Purchasethingstomakeyoufeelhappy. B.Personalizeyourschoolbelongings. C.ItmightseemfunhidinganiPhoneinyoursweatshirtatschool. D.Forinstanceyoucouldjointhemusicloversorchessplayers. E.Ifyoudecidethatyourdaywillbefunitlikelywillbe. F.Joinaclubthatyouhavelittleinterestintomeetsomeoneyoumightnotmeetnormally. G.Whetheryoufindschooldifficultboringorstressfulyoucantrytomakeiteasier.
10分TimeaftertimeIamondifferentinternetforumsandIendupcommunicatingwithpeoplewhowanttostartablogorwebsiteandaregoingtogetstartedsoonthinkingaboutitorstillgoingovermyoptionsandsoon.Whileabitofplanningandresearchwillserveyouwellwhenstartinganyprojectoftenmonthslaterthesesamepeoplearestillthinkingaboutit. Whiletherearemanyreasonsthatmaystopsomeonefromevenstartingaprojecttheyhaveinmindfearbeingthemostobvioustheideaofperfectionismseemstobethesecondmost.1 ThereisaproverbTomorrowisoftenthebusiestdayoftheweek.Thereisnosuchthingastheperfectplan.Infactyouspendsomuchtimebeingconcernedaboutgettingeverythingrightandperfectbutitwearsyourinitialenthusiasmdown.2 Yesyoushouldwanttobereachingforexcellencebutwhostartsoutwithbeingexcellent?Excellencewillonlycomefromtrialanderror. Justmakeadecisionandstartfollowingthrough.Forgettryingtobeaperfectionist.3 ItcomesfromthebeliefthatanythingIdothatislessthanperfectisnotworthdoing.Thiswayofthinkingleadstoonebecomingdiscouragedandthenfailedeventostartyourproject. Tostartjustbeginwithsomethingthatisgoodenoughandthenkeepworkingtoimproveonit.Makeabasicplantakeactionandthenstartimprovingtheactualresults.4Letgoofthefearstopthinkingandstartdoingandforgetstartingoutwithit'sgottobeperfect. I'llleaveyouwiththewordsofanactualdoerwhowasnotaperfectpersonandallhisdecisionswerenotperfect.5Youdon'thavetoseethewholestaircasejusttakethefirststep. A.Infactperfectionismisanunhealthybelief. B.I'llprovideyouwithsomeexamplesofaction. C.Yettheonlywaytoasolutionistostartdoing. D.Howeverheisanexampletobefollowedtoday. E.Onceyoubeginit'softenlesspainfultokeepworking. F.Gettingstartedonaprojectisnotalifeanddeathdecision. G.Theresultisthattimepassesandsodoestheperfectmoment.
“和田白玉”的主要成分是SiO2SiO2属于填物质类别.
氢氧化钠是重要的化工原料其俗称是
7.5分AsayoungchildAnnMakosinskiwouldspendhoursexperimentingwithhertoysandothereverydayobjectsaroundhertocreateherowninventions. Nowafirst﹣yearArtsstudentMakosinskiisawell﹣knowninventor.ShewontherecentSustainableEntrepreneurshipAwardofExcellencewhichrecognizescreativebusinesssolutionstosocialproblems一thesamerecognitionwasgiventoBarackObamain2014.Hertwoinventions﹣theHollowFlashlightandthee﹣Drink﹣havebeencausingexcitementinternationallysincetheircreation. WhenMakosinskiwas15yearsoldshecreatedaflashlightpoweredbytheheatofone'shand.Thisinventionwastheresultofa9thgradescienceprojectbuthergoalwastoofferapracticalsolutiontopeoplewithunlimitedaccesstopowerandelectricity.OneofmyfriendsfromthePhilippinestoldmethatshefailedschoolbecauseshehadnolighttostudywithatnightsothatwaskindoftheinspiration.Makosinskiexplained. At12thgradeMakosinskithenwentontocreatethee﹣Drink.Itisacoffeecupthatharveststheextraheatofahotdrinkwhileitcoolsstoresitaselectricityinanintemal内置的batteryandmakesitavailabletochargeanexternaldevicesuchasaphonewhoselifecannowbelongerbyapproximately10to30minutes. Myfavoritepartofcreatinginventionswouldbewhenyouhadtheideaandyouhavetophysicallybuilditanditdoesn'tworkoutshesaid.Soyouhavetofigureoutdifferentwaystosolveit.AlotoftimesI'llgiveupandI'llcomebackafteracoupleofdaysandI'lltakeitupagain. Heradvicetootherstudentinnovators?Startnow.There'snothingholdingyouback.Actuallyyoucandowhateveryouwant.MakosinskisaidIfyouwanttomakesomethingfollowyourheartthengoahead.Ifthere'ssomethingyoureallywanttodoyouwillmaketimeforitandyouwillfindtimeinthedaytodoyourschoolwork. 1Makosinskycreatedthepowerlessflashlightmainlyto A.satisfyherdesiretocreateinventions B.settleproblemsinstudyforherfriend C.helpthosewhoareshortofelectricity D.finishtheassignmentofascienceproject 2Whichofthefollowingismainlyexplainedinparagraph4? A.Howthee﹣Drinkwasinvented. B.Whythee﹣Drinkwascreated. C.Whatthee﹣Drinkbrings. D.Howthee﹣Drinkworks. 3Whichcanbethebesttitleforthispassage? A.PopularInventionsbyaTeenagerGirl B.TeenagerGirlAdvancinginCreation C.ValuableAdvicefromaCreativeGirl D.AwardsGiventoaYoungInventor
7.5分Believeitornotitistruethatwearelikelytochargeourphoneusingourownbody'senergy.Let'stakealookatthisproduct﹣HandEnergy.HandEnergyisanapple﹣sizeddevicethatchargesourphoneanytimeanywhere. Inatimewherepower﹣banksandsolar﹣powerdeviceshavebecomemainstreamadevicethatletsyouchargedoesn'tsoundveryspecial.Butwhilepower﹣bankshavetobechargedtheold﹣fashionedwayandsolar﹣powerdevicesneedthesuntostoreenergyHandEnergyjustneedsahand.Togetthislittleguytoproduceenergywhichitthenstoresinbuilt﹣inbatteriesallyouhavetodoisholditinyourhandandrotate旋转yourwrists. TouseHandEnergyusersstartbywindingastarterring.Thissendsasignaltoactivatetherotor旋转器atwhichpointtheycanstartrotatingtheirwriststokeeptherotorspinning.ItmightsoundhardtobelievebuttherotorinsideHandEnergyspinsatanaveragespeedof5000rotationsperminutechangingmechanicalpowerintoanelectriccurrentandchargingthebuilt﹣inbatteries.TochargeadeviceallyouhavetodoisconnectittoHandEnergyusingaUSBwire. HandEnergywassuccessfullycrowd﹣fundedonKickstarterraisingover﹩7100000onemonthandwillcomeintothemarketforthemassesinJune2019atapriceof﹩99.Onethingisforsure﹣itbeatspayingthousandsofdollarsonasolar﹣poweredchargingdevice. 1FromthefirsttwoparagraphswecanknowHandEnergyis. A.handytouse B.complexinstructure C.freeofbattery D.solar﹣powered 2HowdoesHandEnergyproduceenergy? A.Byreceivingsignalsfromthestarterring. B.Bykeepingitsrotorspinning. C.Byconnectingittopowersource. D.Byturningelectricpowerintomechanicalpower. 3WhatcanbeinferredaboutHandEnergyfromthelastparagraph? A.Itissortofexpensive. B.Itiswidelyavailable. C.Itispopularwiththepublic. D.Itispromisinginthefuture.
热门题库
更多
高三上学期数学
高一下学期英语
教案备课库
高一上学期生物
高一下学期生物
高二上学期数学
高二上学期物理
高二上学期英语
高二上学期生物
高二下学期数学
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理
高三上学期生物
高三上学期化学