首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
已知双曲线的左右两个顶点是A1，A2，曲线C上的动点P，Q关于x轴对称，直线A1P与A2Q交于点M， （1）求动点M的轨迹D的方程； （2）点E（0，2），轨迹D上的点A，B满足，求实数λ的取值...
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
已知F1F2是双曲线的两个焦点Q.是双曲线上任意一点从某一焦点引∠F1QF2平分线的垂线垂足为P则点
直线
圆
椭圆
双曲线
已知双曲线x2-y2=1点F1F2为其两个焦点点P.为双曲线上一点若PF1⊥PF2则PF1+PF2=
已知椭圆的焦点是F1F2P是椭圆上的一个动点如果延长F1P到Q使得|PQ|=|PF2|那么动点Q的轨
圆
椭圆
双曲线的一支
抛物线
已知函数y＝x－1令x＝―4―3―2－101234可得函数图象上的九个点在这九个点中随机取出两个点P
双曲线实轴的两个顶点为点为双曲线上除外的一个动点若则动点的运动轨迹为
圆
椭圆
双曲线
抛物线
已知双曲线的两个焦点为点在双曲线C.上.Ⅰ求双曲线C.的方程Ⅱ记O.为坐标原点过点Q02的直线l与双
已知双曲线的方程为2x2－y2＝2.1求以A.21为中点的双曲线的弦所在直线的方程.2过点B.11能
已知双曲线的左右两个顶点是A1A2曲线C上的动点PQ关于x轴对称直线A1P与A2Q交于点M 1求
已知双曲线x2－y2＝1点F1F2为其两个焦点点P.为双曲线上一点若PF1⊥PF2则PF1＋PF2＝
已知双曲线x2-y2=1点F.1F.2为其两个焦点点P.为双曲线上一点若PF1⊥PF2则|PF1|+
已知双曲线的焦点在x轴上两个顶点间的距离为2焦点到渐近线的距离为.1求双曲线的标准方程2写出双曲线的
已知双曲线x2﹣=1的左右焦点分别为F1F2过点F2的直线交双曲线右支于A.B.两点若△ABF1是以
设动点P.在直线x=1上O.为坐标原点以OP为直角边点O.为直角顶点作等腰Rt△OPQ则动点Q.的轨
圆
两条平行直线
抛物线
双曲线
.已知以双曲线C.的两个焦点及虚轴的两个端点为顶点的四边形中有一个内角为60°则双曲线C.的离心率为
已知双曲线的焦点在x轴上两个顶点间的距离为2焦点到渐近线的距离为.1求双曲线的标准方程2写出双曲线的
已知中心在原点左右顶点A1A2在x轴上离心率为的双曲线C.经过点P.66动直线l经过△A1PA2的重
设双曲线xy=1的两支为C.1C.2正ΔPQR三顶点在此双曲线上求证P.Q.R.不可能在双曲线的同一
已知双曲线-=1b∈N*的左右两个焦点为F.1F.2P是双曲线上的一点且满足|PF1||PF2|=|
已知双曲线的两个焦点为点在双曲线C.上.1求双曲线C.的方程2记O.为坐标原点过点Q02的直线l与双
设动点P.在直线x＝1上O.为坐标原点以OP为直角边点O.为直角顶点作等腰直角三角形OPQ则动点Q.
圆
两条平行直线
抛物线
双曲线
热门试题
更多
假定你是李华暑假在伦敦学习得知当地美术馆要举办中国画展.请写一封信申请做志愿者内容包括: 1.写信目的; 2.个人优势; 3.能做的事情. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯; 3.结束语已为你写好.
﹣MomI'llstayintoaccompanymygrandpathisevening. ﹣! A.Withpleasure B.Nevermind C.Suityourself D.Itdepends
﹣Iwillhavetwofinalexamstomorrow. ﹣Metoo.Soyouanysympathyfrommehere. A.aren'tgetting B.didn'tget C.hadn'tgot D.haven'tgot
Cooperationatworkisgenerallyseenasagoodthing.ThelatestsurveybytheFinancialTimesofwhatemployerswantfromMBAgraduatesfoundthattheabilitytoworkwithawidevarietyofpeoplewaswhatmanagerswantedmost.Butmanagersalwayshavetobalancethebenefitsofteamworkwhichhelpensurethateveryoneisworkingtowardsthesamegoalwiththedangersof'groupthink'whencriticsarereluctanttopointoutaplan'sdrawbacksforfearofbeingkeptoutofthegroup.ThedisastrousBayofPigsinvasionofCubain1961wasaclassiccaseofgroupthink.SkepticswerereluctanttochallengeJohnF.KennedythenewlyelectedAmericanpresident.Moderncommunicationmethodsmeanthatcooperationismorefrequent.Workersareconstantlyintouchwitheachotherviaemailmessaginggroupsormobilecalls.Butdoesthatimproveorlowerperformance?AnewstudybythreeAmericanacademicstriedtoanswerthisquestion.Theysetalogicalproblemdesigningtheshortestrouteforatravellingsalesmanvisitingvariouscities.Threegroupswereinvolved:onewheresubjectsactedindependently;anotherwheretheysawthesolutionspostedbyteammembersateverystage;andathirdwheretheywerekeptinformedofeachother'sviewsonlyintermittently.Thesurveyfoundthatmembersoftheindividualistgroupreachedthepremiersolutionmoreoftenthantheconstantcooperatorsbuthadapooreraverageresult.Theintermittentcooperatorsfoundtherightresultasoftenastheindividualistsandgotabetteraveragesolution.Whenitcomestoidealgenerationgivingpeopleabitofspacetoasolutionseemstobeagoodidea.Occasionalcooperationcanbeabighelp:mostpeoplehavebenefitedfromacolleague'sbrainwaveorjustasoftenwiseadvicetoavoidaparticularcourseofaction.FurthercluescomefromabookSupermindsbyThomasMaloneoftheMassachusettsInstituteofTechnology.Hesaysthatthreefactorsdeterminethecollectiveintelligenceofcooperatinggroups:socialintelligencehowgoodpeoplewereatratingtheemotionalstatesofothers;theextenttowhichmemberstookpartequallyinconversationthemoreequalthebetter;andthecooperationofwomeninthegroupthehigherthebetter.Groupsrankedhighlyintheseareascooperatedfarbetterthanothers.Inshortcooperationmaybeausefultoolbutitdoesn'tworkineverysituation.1TheauthorcitestheexampleofTheBayofPigsinvasionofCubainParagraph1to.A.provethatteamplayersareskilledatcommunicationB.showthatteamworkcannotalwaysbebeneficialC.provethatcriticsareunwillingtochallengeanybodyD.showthedangerofgroupthinkisnotveryserious2Theunderlinedphrase'theintermittentcooperators'inParagraph3refersto.A.thosewhodonotcooperatewitheachotherB.thosewhoareseldominformedofother'sviewsC.thosewhocooperatewithothersoccasionallyD.theconstantcooperatorswithapooraverageresult3Whichofthefollowingfactorsmakesateamcooperatebetteraccordingtothefourthparagraph?A.Groupmemberscooperatingallthetime.B.Groupmembersinagoodemotionalstate.C.Equaldistributionofmenandwomen.D.Equalparticipationinthecommunication.4Whichcanbethebesttitleofthepassage?A.WhenTeamworkWorksB.WhatTeamworkIsAboutC.WhyTeamworkOperatesD.AUsefulTool:Cooperation
Itwasnearlyaweektherescueteamlocatedthecrashedplane. A.since B.before C.until D.after
BathingcrabsareraisedintheYangchengLakeforatleastsixmonthswhichiswhatmakesthemauthenticandahighprice. A.estimate B.fetch C.occupy D.predict
Studentsshouldinvolvethemselvesincommunityactivitiestheycangainexperienceforgrowth. A.who B.when C.which D.where
IfshemakesuchasimplewishasnottobeteasedfordisabilitylastChristmasAmywouldstillfeellonelynow. A.haddarednot B.hadn'tdaredto C.darednot D.didn'tdareto
Asdataandidentitytheftbecomesmoreandmorecommonthemarketisgrowingforbiometric生物测量technologies﹣likefingerprintscans﹣tokeepothersoutofprivatee﹣spaces.Atpresentthesetechnologiesarestillexpensivethough.ResearchersfromGeorgiaTechsaythattheyhavecomeupwithalow﹣costdevice装置thatgetsaroundthisproblem:asmartkeyboard.Thissmartkeyboardpreciselymeasuresthecadence节奏withwhichonetypesandthepressurefingersapplytoeachkey.Thekeyboardcouldofferastronglayerofsecuritybyanalyzingthingsliketheforceofauser'stypingandthetimebetweenkeypresses.Thesepatternsareuniquetoeachperson.Thusthekeyboardcandeterminepeople'sidentitiesandbyextensionwhethertheyshouldbegivenaccesstothecomputerit'sconnectedto﹣regardlessofwhethersomeonegetsthepasswordright.Italsodoesn'trequireanewtypeoftechnologythatpeoplearen'talreadyfamiliarwith.Everybodyusesakeyboardandeverybodytypesdifferently.Inastudydescribingthetechnologytheresearchershad100volunteerstypetheword'touch'fourtimesusingthesmartkeyboard.Datacollectedfromthedevicecouldbeusedtorecognizedifferentparticipantsbasedonhowtheytypedwithverylowerrorrates.Theresearcherssaythatthekeyboardshouldbeprettystraightforwardtocommercializeandismostlymadeofinexpensiveplastic﹣likeparts.Theteamhopestomakeittomarketinthenearfuture.1Whydotheresearchersdevelopthesmartkeyboard?A.Toreducepressureonkeys.B.Toimproveaccuracyintyping.C.Toreplacethepasswordsystem.D.Tocutthecostofe﹣spaceprotection.2Whatmakestheinventionofthesmartkeyboardpossible?A.Computersaremucheasiertooperate.B.Fingerprintscanningtechniquesdevelopfast.C.Typingpatternsvaryfrompersontoperson.D.Datasecuritymeasuresareguaranteed.3Whatdotheresearchersexpectofthesmartkeyboard?A.It'llbeenvironment﹣friendly.B.It'llreachconsumerssoon.C.It'llbemadeofplastics.D.It'llhelpspeeduptyping.4Whereisthistextmostlikelyfrom?A.Adiary.B.Aguidebook.C.Anovel.D.Amagazine.
TheEuropeanmarkethaslongbeenfavoringagoodmanyAfricanandCaribbeancountriesformercoloniesofBritainorFrance. A.manyofwhom B.manyofthem C.manyofwhich D.andmanyofthem
WithitsGeorgianbrickbuildingsandgrassygreenhillsalmosteverywhereinBathfeelslikealivingpostcard.WithlandmarksfromRomanandmedievaltimesyoumayfeelyou'velandedbackintimebutthesplendidrowhousesandpeoplehustlingaboutonsmart﹣phonesbringsyououtofthatfantasy.Bathsomehowweavestogetherthreadsofsmall﹣townlifewithmetropolitanstyle.Ithasgalleriesmuseumsandtheaters.It'sacollegetownanchoredbytheUniversityofBath.AnditisaUNESCOWorldHeritagesite.EvenonameredaytripfromLondonjust90minutesawaybytrainBathbubblesoverwithcharm.BathAbbeyAnimpressivelandmarkinthecenteroftownBathAbbeyisthethirdplaceofworshiptooccupythissitein1200years.Thefirstchurchbuiltin757wasreplacedbyacathedralsoonaftertheNormanconquestofEnglandin1066.Thatonegavewayinthe15thcenturytotheAbbeythat'stheretoday.Walkinsideandeyetheceilingandstainedglasswindowsshowing56scenesfromChrist'slife.AfloorplatemarksQueenElizabethII's1973visit.Toursofthechurchtowerareavailable.RomanBathsTheRomanBathsdatebacktotheyear70withapoolofnaturalhotspringwatercalledtheGreatBathlocatedbelowstreetlevel.Youcanseethesteamswirlingonthestreetabove.Peopledressedinperiodclothing﹣suchasaRomansoldierorstonemason﹣standinthearchways.Thecomplexincludesseveralundergroundspacesanddisplays.Theself﹣guidedaudiotourthoroughlyexplainshowthecitizensofAquaeSulistheRomannamegiventoBathsocializedworkedandworshipped.Attheendofthetourvisitorscansamplesomeofthatrefreshingwater.JaneAustenCentreNovelistJaneAustenlivedwithfamilyinBathbetween1801and1806.AvidreadersofAusten'sworkknowthatBathwasaprominentsettingintwoofherbooksPersuasionandNorthangerAbbey.TheJaneAustenCentreathree﹣storybuildingonGayStreethasapermanentexhibitandtearoom.TheexhibitofferstwofloorsofclothesanecdotesaboutwhatdailylifewouldhavebeenlikeforAusteninBath.Youcanendyourwanderingwithafternoonteainthethird﹣floorRegencyTeaRoom.RoyalCrescentThishalf﹣moonformationofGeorgiantownhousesisoneofBath'smostfamousarchitecturalmasterpiecesanarc﹣shapedclusterofbuildingssetbehindagreenfield.ThefirsthomeNo.1RoyalCrescentwhereformerParliamentmemberHenrySanfordlivedinthelate1700sisalsoamuseum.Roomsarefurnishedin18thcenturystylewithaglimpseoftheupstairs﹣downstairslifestyleoftheerathinkDowntonAbbeybut150yearsearlier.1AccordingtothearticlethefollowingaspectsofBatharecoveredEXCEPT.A.historyB.architectureC.transportationD.accommodation2WhichofthefollowingstatementisINCORRECTaccordingtothepassage?A.BathAbbeyoccupiedthesiteinthe15thcenturyafterseveralhistoricalchanges.B.TheRomanBathsarefeaturedbyahotspringwaterwhereyoucantouraroundwiththelocalguide.C.TwoofJaneAustin'sbooksweresetinBathwhereshelivedfor5years.D.TheroomsinNo.1RoyalCrescentarefurnishedin18thcenturystyleresemblingthatofDowntonAbbey.
Thechangesfacingfastfoodcompanies Fastfoodwasoncethoughttoberecessionproof.WhenconsumersneedtocutspendingcheapmealslikeBigMacsandWhoppersbecomeevenmoreattractive.Asaresultfastfoodchainshavesurvivedtherecessionbetterthantheirmoreexpensivecompetitors.In2009salesatfullservicerestaurantsinAmericafellbymorethan6%buttotalsalesremainedaboutthesameatfastfoodchains.InsomemarketssuchasJapanFranceandBritaintotalspendingonfastfoodincreased. Butinthisongoingrecession萧条whichismoreseverenotallfastfoodcompanieshavebeenasfortunate.ManysuchasBurgerKinghaveseensalesfall.Intherecessionwhilesomepeopletradedowntofastfoodmanyotherseatathomemorefrequentlytosavemoney.SmallerfastfoodchainsinAmericasuchasJackintheBoxandCarl'sJr.havebeenhitparticularlyhardinthisdownturnbecausetheycutbackspendingonadvertising. Infaceofsuchchallengessomefastfoodcompanieshavesacrificedtheirownprofitsbytryingtogivecustomersbettervalue.Duringtherecessioncompaniessetpriceslowhopingtotemptmorecustomersthroughthedoor.Butinmanycasesthatstrategydoesn'twork.Somecompaniesarerethinkingtheirstrategies.KFChaslaunchedachickensandwichthatcostsaround﹩5toattractconsumersawayfrom﹩1specials. Companiesarealsotryingtogetcustomerstobuynewandmoreitemsincludingdrinks.McDonald'sstartedsellingbettercoffeeasachallengetoStarbucks.ItsMcCafelinenowaccountsforanestimated6%ofsalesinAmerica.Asfastfoodcompaniesshiftfromsupersizetomorebuystheyneedtokeepcustomertraffichighthroughouttheday.Manyseebreakfastasabigopportunityandnotjustforfattyfood.McDonald'shasstartedsellingporridgeinAmericabecausetheprofitscanbehigh. Butwhataboutthosegrowingwaistlines?Sofarfastfoodfirmshavecleverlyavoidedgovernmentregulation.Byprovidingoptionslikesaladsandlowcaloriesandwichestheyhaveatleastgiventheimpressionofdoingsomethingabouthelpingtofightobesity肥胖.Theseofferingsdon'tnecessarilyleadtoprofitlossastheycanbroadentheappealofstorestogroupsofdinersthatincludesomepeoplewhodon'twanttoeataburger. Butcallsfortoughergovernmentregulationneverweardown.ThisyearCongresspassedAmerica'shealthreformbillwhichrequiresrestaurantchainswith20ormorestorestoputthecaloriecontentofitemstheyservetothemenu.AndtherecentproposalbyacountyinCaliforniatobanMcDonald'sfromincludingtoysinitshighcalorieHappyMealsbecauselawmakersbelieveitattractschildrentounhealthyfoodsuggeststhatfastfoodcompanieswillhavetocontinuetryingsomethingnew. Thechangesfacingfastfoodcompanies
Sometimesweallgetthefeelingthatwearen'tmakingtheprogresswewanttoinlife.Perhapswedon'thavethecareerwewanttherelationshipwewantorthebodywewant.|Thisisasomewhatuniversalexperiencebutsomeofusfeelitmorestronglythanothers.Andwhenithasbeengoingonlongenoughwestarttolookforhelpfromoutsidesources.Thisiswherethelifecoachcomesinassomeonewhopromisestohelpussortourlivesoutandmakepositiveprogresstowardourgoals. Theeasiestwaytothinkofalifecoachisasapersonaltrainerforyourentirelife.Whileapersonaltrainermightwriteyouaprogramtohelpyougetinshapeandthenencourageyoutocarryoutthatprogramalifecoachwillgiveyouaprogramthatcanhelpyouinmultipleareasofyourlifeandthengiveyouthesamemotivationandencouragement.Ideallythisshouldmeandevelopinginyouthekindoftraitsandknowledgethatwilleventuallyallowyoutooutgrowyourneedforthem. Intheorythere'snothingwrongwiththeconceptoflifecoaching.Theissueinsteadcomesfromthefactthatthereisnoregulationinthismulti﹣milliondollarindustry.Ifyouareinterestedinbecomingalifecoachthenyoucanquiteeasilyapplyonlineandcompleteacourseforaround＄3000.Onecoursepromisesthatyoucanbecomeaqualifiedcoachinjustsixdays!Thisshouldberingingalarmbellsforanyonethinkingofhiringalifecoach.Thisissomeonewhoclaimstohavetheknowledgetohelpyouineveryaspectofyourlife.Howeverisitreallytrue?Ithinkit'sstillquestionable.Ofcoursethisdoesn'tmeanthatthereisnogoodlifecoach.Allitmeansisthattherearemaybadonesoutthereandthatit'sverydifficulttotellthemapartfromtheonesthatoffergenuinevalue. Thereforeit'simportanttorememberthatthebestlifecoachintheworldcanonlydosomuch.Behonestwithyourselfandaskyourselfwhetheryoureallyneedtoshifttheresponsibilityontosomeoneelse.Andyoushouldcertainlythinktwicebeforespendinglargeamountsofmoneyhiringalifecoachespeciallyifyou'recurrentlyunhappywithyourfinancialsituation!Additionallyyou'resupposedtoconsiderthefactthattherearemanyprofessionalswithfarmorequalificationsrelatingtovariousdifferentaspectsofyourlife.Youcanhireapersonaltrainertohelpyouwithfinancesandapersonalshoppertohelpyoupickoutyourclothes.Thiswillbringaboutfarmoregreatchangesthanthevastmajorityoflifecoachescan!
已知双曲线的渐近线方程为y＝±x一个焦点F20则该双曲线的虚轴长为
YouhadbetterstayinChinaforfurthereducation.SometopAmericanuniversitiesareaccusedofAsianAmericanapplicantsusingraceasafactor. A.welcoming B.employing C.denying D.restoring
Ihavehadalifelongfascination﹣callitobsessionifyoulike﹣withcommunicationwithmakinglinkstootherplacesotherculturesotherworlds.Therootsofthisobsessionhaveoftenpuzzledme.Iamnot﹣neverhavebeen﹣agregariousperson.QuitetheoppositeIwasasolitarychildandmyclassmatesatschoolanduniversityalwaysthoughtofmeasaloner.Iwasnevercrazyaboutthenoisysolidarityofsocialgatherings.SowhywasIpossessedofadesiretomakecontactwithdistantplaces?ItcanpartlybeexplainedbythestartIhadinlife.Igrewuponwhatseemedatthetimeliketheedgeoftheworld﹣inaremotepartofruralIrelandinahouseholdwithfewbooksormagazinesandnotelevision.Foreigntravelwasunheardof.ApartfromthosewhoemigratedtoGreatBritainortheUnitedStatesvirtuallynobodyweknewhadeverbeenabroad.NobodyeverwentoverseasonholidayandnoforeignlanguagesweretaughtintheschoolsIattended﹣withtheexceptionofLatin.Welivedinaclosedsocietythatthoughtofitselfasself﹣sufficient.Therewashoweveronechinkoflightinthesuffocatinggloom﹣theradiowhichwecalled'thewireless.'Itwasbymodernstandardsahugeapparatuspoweredbyvalves﹣whichiswhyittooksometimetowarmup﹣anda'magiceye'tuningindicator﹣agreenishglasscirclethatwinkedatyouasthesignalwaxedorwaned.Thebestthingaboutourwirelessthoughwasthatithadashortwaveband.Thiswasthesourceofendlessfascinationtomebecauseitmeantthatevenwiththisprimitivedeviceonecouldlistentotheworld.AtfirstIcouldn'tunderstandhowitworked.Whywasreceptionsomuchbetteratnight?Whywasitsoinfuriatinglyvariable?Iaskedmyfatherwholookedevasiveandjustsaidithadsomethingtodowith'thewhachamacallitsphere'healwayscalledcomplicatedthingsthewhachamacallitbutthisgavemeenoughofasteertogotothelocallibraryandstartdigging.InduecourseIdiscoveredthathewasreferringtotheionosphere﹣alayerofchargedparticleshighupattheedgeoftheEarth'satmospherethatactsasakindofreflectorforradiowavesofcertainfrequencies.Thereasonshortwaveradiocouldtravelsuchhugedistanceswasthatitusedtheionospheretobouncesignalsroundtheworld﹣whichwaswhyradiohamsinLatinAmericaorAustraliacouldsometimesbeheardbyayoungboyonthewesternseaboardofIreland.Signalsfromsuchdistantshoresweremorelikelytogetthroughatnightbecausethentheionospherewashigherandtransmissionoverlongerdistanceswaspossible.Iwasspellboundbythisdiscoveryofhowtechnologycouldpiggybackonanaturalphenomenontopushforwardlow﹣powersignalsthroughimmensedistances.ButmostofallIwasentrancedbytheideaofshortwaveradioforthiswasatechnologywhichbelongednottogreatcorporationsorgovernmentsbuttopeople.Itwaspossiblemyfatherexplainedtoobtainalicensetooperateyourownshortwaveradiostation.Andallovertheglobepeopleheldsuchlicenseswhichenabledthemtositintheirbackroomsandbroadcasttothewholeworld.Theworldsuddenlyseemedwideopentome.1Thesecondparagraphprimarilyservesto.A.revealtheauthor'sattitudetowardforeignculturesB.presentinformationthatshedslightonacertainpreoccupationC.todisplaytheauthor'snostalgiaforhisadolescenceD.foreshadowthecrucialdifferencebetweentheauthorandhisfather2Theauthorconsidershisfather'sanswerinParagraph3tobe.A.incompletebuthelpfulB.humorousbutmeaningfulC.lightheartedyetconcernedD.sillyandconfusing3Whichofthefollowingiftruewouldmostweakentheclaimofoperatingashortwaveradiostation?A.ManygovernmentsaroundtheworlddonotregulateshortwaveusersB.ShortwaveequipmentisveryinexpensiveandisgettingcheaperallthetimeC.Mostindividualswhoapplyforshortwavelicensesareturneddown.D.CommunicationsexpertspredictthattheInternetwilleventuallyreplaceshortwaveradio.4Thepassageisprimarilyabouttheauthor's.A.decisiontopursueacareerinscienceB.acceptanceofhisfamily'sshelteredoutlookC.devotiontothestudyofemergingtechnologyD.discoveryofamedium'sliberatingpotential
某电商为某次活动设计了“和谐”“爱国”“敬业”三种红包活动规定每人可以依次点击4次每次都会获得三种红包的一种若集全三种即可获奖但三种红包出现的顺序不同对应的奖次也不同．员工甲按规定依次点击了4次直到第4次才获奖．则他获得奖次的不同情形种数为
已知复数z满足z1﹣i＝2﹣i其中i是虚数单位则复数z在复平面内对应的点位于
已知F1F2是椭圆+＝1的左右焦点点M的坐标为﹣1则∠F1MF2的角平分线所在直线的斜率为
Raisingachildcanbebutitiswellworthit. A.overthemoon B.apieceofcake C.onitslastlegs D.aHerculeantask
It'sthattimeofyearagainwhenAlipayusjusthowmuchwe'vebeenspendingandonwhat. A.reminds B.reminded C.hasreminded D.isreminding
ThepolarbearisfoundintheArcticCircleandsomebiglandmassesasfarsouthasNewfoundland.Whiletheyarerarenorthof88°thereisevidence1theyrangeallthewayacrosstheArcticandasfarsouthasJamesBayinCanada.Itisdifficulttofigureoutaglobalpopulationofpolarbearsasmuchoftherangehasbeen2poorstudied;howeverbiologistscalculatethatthereareabout20000﹣25000polarbearsworldwide. Modernmethods3trackingpolarbearpopulationshavebeenemployedonlysincethemid﹣1980sandareexpensive4performconsistentlyoveralargearea.InrecentyearssomeInuitpeopleinNunayut5reportincreasesinbearsightingsaroundhumansettlementsleadingtoa6believethatpopulationsareincreasing.Scientistshaverespondedby7notethathungrybearsmaybecongregating聚集aroundhumansettlementsleadingtotheillusion错觉thatpopulationsare8highthantheyactuallyare.Of9nineteenrecognizedpolarbearsubpopulationsthreearedecliningsix10bestableoneisincreasingandninelackenoughdata.
IsFreshAirReallyGoodforYou? Weallgrewuphearingpeopletellustogooutandgetsomefreshair.1AccordingtorecentstudiestheanswerisabigYESiftheairqualityinyourcampingareaisgood. 2Iftheairyou'rebreathingisclean﹣whichitwouldbeifyou'reawayfromthesmogofcities﹣thentheairisfilledwithlife﹣givingenergizingoxygen.Ifyouexerciseoutofdoorsyourbodywilllearntobreathemoredeeplyallowingevenmoreoxygentogettoyourmuscles肌肉andyourbrain. Recentlypeoplehavebegunstudyingtheconnectionbetweenthenaturalworldandhealing治愈.3Intheseplacespatientscangotobenearnatureduringtheirrecovery.Itturnsoutthatjustlookingatgreengrowingthingscanreducestresslowerbloodpressureandputpeopleintoabettermood情绪.Greeneryisgoodforus.HospitalpatientsWhoseetreebranchesouttheirwindowarelikelytorecoveratafasterratethanpatientswhoseebuildingsorskyinstead.4Itgivesusagreatfeelingofpeace. 5Whilethesun'srayscanageandharmourskintheyalsogiveisbeneficialVitaminD.TomakesureyougetenoughVitaminD﹣butstillprotectyourskin﹣putonsunscreenrightasyouheadoutside.Ittakessunscreenaboutfifteenminutestostartworkingandthat'splentyoftimeforyourskintoabsorbaday'sworthofVitaminD. A.Freshaircleansourlungs. B.Sowhatareyouwaitingfor? C.Beinginnaturerefreshesus. D.Anothersidebenefitofgettingfreshairissunlight. E.Butisfreshairreallyasgoodforyouasyourmotheralwayssaid? F.Justasimportantlywetendtoassociateairwithhealthcare. G.AllacrossthecountryrecoverycentershavebegunbuildingHealingGardens.
Allchildrenshouldgetaccesstoahigh﹣qualityeducationtheirracezipcodeorfamilyincome. A.dueto B.regardlessof C.apartfrom D.dependingon
Thecreationcankeeppeopleawayfromtheirsmartphonesinawaysimilartoe﹣cigaretteshaveallowedpeopletoquitsmoking. A.that B.how C.which D.what
1Inwhichrestaurantcanyouhaveamealwithpeacefulcountrysurroundings?A.CHANGTOMTHAIRESTAURANTANDHOTELB.JACK'STRADITIONALANDAMERICANRESTAURANTC.MOGHULEXPRESSINDIANTAKEAWAYD.THEMARINARESTAURANT2Itcanbeconcludedthat.A.youcanenjoythefreshestlocalproduceinCHANGTOMTHAIRESTAURANTANDHOTELB.JACK'STRADITIONALANDAMERICANRESTAURANTsatisfiesalldifferenttastesC.youcanhaveyourorderdeliveredinMOGHULEXPRESSINDIANTAKEAWAYforanextrafeeD.THEMARINARESTAURANTprovidesthebestaccommodationofthefourrestaurants
﹣ThesewinterdaysaregettingtobemorethanIcantake. ﹣Holdon.Accordingtotheweatherreportpeoplehavesomereliefbytheendoftheweek. A.would B.should C.need D.shall
IamimpressedwithChina'scommitmenttoitsclimategoalsevidencedbythefactwearesureofChinahasmetits2020targetsthreeyearsaheadofschedule. A.that B.which C.what D.where
NeedaJobThisSummer?Theprovincialgovernmentanditspartnersoffermanyprogramstohelpstudentsfindsummerjobs.Thedeadlinesandwhatyouneedtoapplydependontheprogram.Notastudent?Gotothegovernmentwebsitetolearnaboutprogramsandonlinetoolsavailabletohelppeopleunder30buildskillsfindajoborstartbusinessesallyearround.JobsforYouthIfyouareateenagerlivingincertainpartsoftheprovinceyoucouldbeeligible符合条件forthisprogramWhichprovideseightweeksofpaidemploymentalongwithtraining.Whoiseligible:Youth15﹣18yearsoldinselectcommunities社区.SummerCompanySummerCompanyprovidesstudentswithhands﹣onbusinesstrainingandawardsofupto$3000tostartandruntheirownsummerbusinesses.Whoiseligible:Studentsaged15﹣29returningtoschoolinthefall.StewardshipYouthRangerProgramYoucouldapplytobeaStewardshipYouthRangerandworkonlocalnaturalresourcemanagementprojectsforeightweeksthissummer.Whoiseligible:Studentsaged16or17attimeofhirebutnotturning18beforeDecember31thisyear.SummerEmploymentOpportunities机会ThroughtheSummerEmploymentOpportunitiesprogramstudentsarehiredeachyearinavarietyofsummerpositionsacrosstheProvincialPublicServiceitsrelatedagenciesandcommunitygroups.Whoiseligible:Studentsaged15orolder.Somepositionsrequirestudentstobe15to24orupto29forpersonswithadisability.1WhatisspecialaboutSummerCompany?A.Itrequiresnotrainingbeforeemployment.B.Itprovidesawardsforrunningnewbusinesses.C.Itallowsonetoworkinthenaturalenvironment.D.Itoffersmoresummerjobopportunities.2WhatistheagerangerequiredbyStewardshipYouthRangerProgram?A.15﹣18.B.15﹣24.C.15﹣29.D.16﹣17.3Whichprogramfavorsthedisabled?A.JobsforYouth.B.SummerCompany.C.StewardshipYouthRangerProgram.D.SummerEmploymentOpportunities.
设向量＝m0＝11且||2＝||2﹣|﹣|2则m等于
热门题库
更多
高三下学期数学
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
湘公网安备 43130202000226号