首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
二次函数y＝ax2+bx+c的图象如图所示，那么关于此二次函数的下列四个结论：①a＜0；②c＞0；③b2﹣4ac＞0；④＜0中，正确的结论有（ ）
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
已知二次函数y=ax2+bx+c的图象如图所示则毛1这个二次函数的解析式为__________2当x
已知二次函数y=ax2+bx+c的图象如图所示则毛1这个二次函数的解析式为__________2当x
已知:二次函数y=ax2+bx+c的图象如图所示则ab______0填〉〈或＝
如图2－128所示的是二次函数y＝ax2＋bx＋c的图象则一次函数y=ax－b的图象不经过
第一象限
第二象限
第三象限
第四象限
二次函数y＝ax2＋bx＋ca≠0的大致图象如图所示关于该二次函数下列说法错误的是
函数有最小值
对称轴是直线x＝
当x＜
时，y随x的增大而减小
当－1＜x＜2时，y＞0
二次函数y=ax2+bx+ca≠0的图象如图所示那么一元二次方程ax2+bx+c=ma≠0m为常数且
1
2
-1
-2
二次函数y＝ax2＋bx＋c的部分图象如图所示由图象可知该二次函数的图象的对称轴是直线x＝.
已知:如图所示一次函数y=-2x+3的图象与x轴y轴分别交于A.C.两点二次函数y=x2+bx+c的
定义如果二次函数y=ax2+bx+c的图象经过点﹣10那么称此二次函数图象为线性曲线.例如二次函数y
二次函数y＝ax2＋bx＋c的图象如图所示则方程ax2＋bx＋c＝0的两根为____________
若二次函数y=ax2+bx+c的图象如图所示则直线y=abx+c不过第_____象限.
若二次函数y=ax2+bx+c的图象如图2所示则直线y=abx+c不经过_____象限.
已知二次函数y＝ax2＋bx＋c的图象经过A－1－1B02C13.1求二次函数的表达式2画出二次函数
二次函数y=ax2+bx+c的图象如图所示当函数值y＜0时自变量x的取值范围是__________.
二次函数y＝ax2＋bx＋c的图象如图所示下列结论错误的是A.ab＜0B.ac＜0C.当x＜2时函数
如图已知一次函数y＝0.5x+2的图象与x轴交于点A.与二次函数y＝ax2+bx+c的图象交于y轴上
二次函数y＝ax2＋bx＋c的图象如图所示则方程ax2＋bx＋c＝0的两根为____________
二次函数y＝ax2＋bx＋c的部分图象如图所示由图象可知该二次函数的图象的对称轴是直线x＝.
已知二次函数y＝ax2＋bx－3的图象经过点A.2－3B.－10.1求二次函数的解析式2填空要使该二
已知二次函数y=ax2+bx+cabc是常数图象如图所示则当x满足的条件是
热门试题
更多
TheQingmingFestivaliscelebratedwithathree﹣daynationalholidaywhosenameoriginatesfromthesayingPlantsstarttoreviveandprosperatQingminginacleanandbrightway.ThusthefestivaliscalledQingmingwhichmeanscleanandbright.1Tombsweepingaimstocommemoratefamilyancestorswhilegoingonaspringoutingallowseveryonethechancetoenjoythebeautifulsceneryandenjoytheseason. Traditionalcustoms Tombsweeping.2Onthisdaythewholefamilygathersinfrontoftheirancestraltombs.Theyofferfruitandwinetotheirancestorsandcleantheweedsfromaroundthetomb.Finallytheykowtowandprayhopingfortheirancestors'blessingfortherestoftheyear. Springouting.ThetimearoundtheQingmingFestivalisoneofthemostsuitableseasonsforaspringoutingasplantsarethrivingandflowersareblooming.Peoplecanhaveagreattimeoutdoorswiththeirfriendsandfamily.3 Traditionalfood QingtuanagreenriceballtinyenoughtofitintoyourhandisalsocalledQingmingguoorAiguo.4ItisamixtureofstickyricepowderandgreenvegetablejuicestuffedwithsweetenedbeanpasteQingtuantastessweetwiththefreshfragranceofAicaoagreenspringvegetable. IncelebrationofQingmingpeoplefromShaanximakesteamedbunsknownasHuamomadeintodifferentshapes.5Someareforpeacefulfamilylifewhileothersrepresentthewishforhealth. A.Witheachdistinctlookcomesagoodblessing B.Playingfootballandflyingkitesarepopularactivities. C.ItispopularinthesouthernregionsoftheYangtzeRiver. D.Familymembersgathertogethertocelebrateandtastethefood. E.ThetraditionoftombsweepingoriginatesfromtheQinDynasty F.Manytraditionalcustomsarepracticedtoshowrespectforourancestors. G.Thetwomainactivitiesoverthefestivalincludetombsweepingandgoingonaspringouting.
Societytellsusthatyoucan'tteachanolddognewtricks.Butitdoesn'thavetobethatway.AnewstudypublishedinHumanDevelopmentpointsoutthatusingachildlikeapproachtolearningcanhelppeopleofanyagetakeonandrisetonewchallenges.1 Venture冒险outsideyourcomfortzone.Asadultswetendtousesimilarskillsdayinanddayout:Wetakejobsinfieldswerealreadygoodatdrivethesameroutestothesameplacesandfallintoroutineswe'recomfortablewith.2.Switchingtosomethingmorechallengingmayhavemorecognitivebenefits. 3.Afearofmakingmistakesisanotherreasonadultsaresoslowtolearnnewthings;ifwetryandfailwecanfacecriticismlosemoneyorgetfired.That'swhyit'simportanttobuildupasupportnetworkofpeople﹣atworkandathome﹣whoallowyoutomakemistakesandlearnfromthem. Makeaseriouscommitmentanddon'tgiveup.4.Ifyoucanafforditspendingmoneyonanewpursuit﹣forexamplebookingatriptoRometopracticeyourItalian﹣mightalsomakeithardertothrowinthetowel. Learnmorethanonethingatonce.Wetendtozeroinononehobbyoroneskill.Butdividingthattimeandenergyintothreeorfourareaswillstretchyourbraininalldifferentdirections.5Forexamplemaybeyoustartedlearninganewlanguagein2018andthisyearyouaddsinginglessonsandnextyearyoutrysomethingelse.Youcanaddthingsgraduallybasedonwhatyoucanhandle. A.Turntoyourfriendsandfamily. B.Thefollowingstrategieswilldothetrick. C.Surroundyourselfwithencouragingpeople. D.Tellingfriendsaboutyournewgoalcanhelpkeepyoumotivated. E.Butallthisfamiliaritylimitsthepartsofthebrainwe'reusingregularly. F.Thatdoesn'tmeanyoushouldstartallthenewchallengesallatoncethough. G.Sofeelingcomfortablecanreducestressandmakeyouhappierandmoreproductive.
TOKYOJune8Xinhua﹣﹣TheBeijingOrganizingCommitteeofthe2022OlympicandParalympicsWinterGamesheldapromotioneventintheJapanesecapitalTokyoonSaturdaytointroducethelatestdevelopmentsinpreparationfortheBeijingWinterOlympics. ThepromotioneventwhichusedanexhibitionwallandtheCharmingBeijingphotoexhibitiontoshowcasethepreparationsofBeijing2022waspartofBeijingWeekaseriesofactivitiestocommemoratethe40thanniversaryoftheestablishmentofsister﹣cityrelationsbetweenBeijingandTokyo. Ontheexhibitionwallwithanareaof33squaremetersBeijing2022organizersshowcasedfiveaspectsincludingtheBeijingWinterOlympicsvisionBeijing'swintersportstraditionemblem2íofBeijing2022competitionplanningandtheNationalSpeedSkatingOval. AtthesametimeoldphotosoftheChineseandJapaneseicehockeyteamsechoedthe40thanniversaryoftheestablishmentofsister﹣cityrelationsbetweenthetwocitiesandthethemeoftheBeijingWinterOlympics. ThepromotionvideosoftheBeijing2022emblemsaswellasotherrelatedvideoclipsdrewgreatinterestoftheaudience. TheCharmingBeijingphotoexhibitiondisplayedsomeoftheWinterOlympicvenuesshowingtheprogressofthepreparationsfortheBeijingWinterOlympics. MeanwhilesandtableVRglassesandtheBeijingWinterOlympicsBrochurearealsoprovidedtolettheaudiencevisuallyexperiencetheuniquecharmoftheNationalSpeedSkatingOvalandthefeaturesofothercompetitionvenues. ChangYuDirectorGeneraloftheMediaandCommunicationsDepartmentoftheBeijingWinterOlympicOrganizingCommitteeintroducedtheprogressofthepreparations2022andthevisionofcooperationbetweenBeijing2022andTokyo2020. ChangYusaidthattheBeijingWinterOlympicsOrganizingCommitteestayscommittedtowiththeaimofdeliveringahostingtheGamesinagreeninclusiveopenandcleanmannerwithanaimofdeliveringafantasticextraordinaryandexcellentOlympiceventtotheworld. TheBeijingWinterOlympicswillopenonFebruary42022.whichwillfeaturesports15disciplinesand109events. 1Howwasthepromotioneventcarriedout AByadvertisingonTVinBeijingandTokyo. B.BysendingoffbrochurestocitizensinTokyo. C.Byprovidingvariousvisualexperiences D.ThroughtoursallaroundTokyo. 2Theunderlinedwordcommemorateinparagraph2isclosestinmeaningto A.celebrate B.appreciate C.compare D.combine 3WhatcanbeinferredfromChangYu'sintroduction A.BeijingwillhosttheOlympicsearlierthanTokyo. B.Beijingiswellpreparedforthe2022event C.Beijing2022provesagreatsuccess. D.Beijing2022willbeenvironmental﹣friendly. 4Whichofthefollowingcanbethetitleofthispassage A.TheSister﹣CityAnniversarybetweenBeijingandTokyo B.Beijing2022PromotionEventinTokyo C.BeijingandTokyoFriendshipForever D.PreparationsforBeijing2022Olympic
Beijingroastduckwhichishonoredasbyfar1deliciousdishintheworldhaswonfamebothathomeandabroad.Nowadaysanincreasingnumberof2foreignertravelingtoBeijingfallinlovewith3. Preparingqualityroastduck4bealongcomplicatedprocessofmanystepsfromselectingtheduckatthebeginningto5serveittothedinersattheend.Eachstepiscarefullytakentoguaranteetheroastduckisattractivein6appearredincolorfragrantandhotwiththinsteamwhenserved.Intherestaurantducksareroastedupontheorderofthediners.Afteraroastduckisreadyitisbroughttothedinersinfrontof7achefwillskillfullyslicethejuicymeateachpiecewithwell﹣cookedskin8attach.Youcandiptheslicesofduckintosweetsauce酱andwrapthemeatwithsomespringonionsinsideathinpancakeandonlythendoesonefinallytakeabite!Normallytheremainingbonesoftheduck9cookslowlyinacloseddishformakingdeliciouscream﹣whitesoup.Allgoeswellwithwinethusmakingthedinner10unforgettablefull﹣duckbanquet宴会.
Whenhospitalstaffareinfullscrubs手术衣theirfacesarealmostcompletelycoveredbytheircapsandfacemasksandwecanonlyseetheireyesandeyebrows.InordertosolvetheproblemadoctorinSydneyAustraliacalledRobHackettlaunchedacampaignnamedTheatre手术室CapChallenge﹣encouragehospitalstaffstowritetheir'namesandrolesontheircaps.Atfirsthiscolleaguesdidn'ttakeitseriously.HoweverwithtimegoingonithasbeenadoptedaroundtheworldwithstudiesfromtheUSandUKreportinghowthissimpleideacandecreasehumanerrorsinhealthcare. Iwenttoatheatrewheretherewereabout20doctorsandnursesintheroomDr.RobHackettsaid.IstruggledtoevenasktobepassedsomeglovesbecausethepersonIwaspointingtothoughtIwaspointingtothepersonbehindthembecauseIdon'tknowtheirnames.saidRob.Asweallknowdoctorsareastressfulprofession.Whenfacedwithlifeanddeaththeyneedtosavethepatient'slifeforasecond.Atthemomenteffectivecommunicationsareimportant. TheTheatreCapChallenge'isinresponsetoconcernsabouthoweasilyavoidablemistakesandpoorcommunicationarecontributingtorisingharmfuleventsforourpatients.saidRob.Weneedtodevelopsystemswhichreducemistakesandmisunderstandingwithoutcausingharm.Forthistohappenweneedtoleteveryoneknowwe'rehuman.headded. Ontheotherhandfromthepatients'viewpointcapswithnamesonthemcanmakepatientsmoreunworried.Wheneveryoneappearsthenameitisextremelydifficulttodistinguishwhoiswho.Knowingthemrelaxed. 1Whatcanwelearnfromparagraph1 A.Hospitalstaffareaskedtocovertheirfacesinhospitals. B.Robisinfavorofwritingnamesandrolesoncaps C.Robwantedtobeaprofessionaldoctor. D.Rob'sideacanincreasehumanerrorsinhealthcare. 2WhatcanweknowabouttheTheatreCapChallengefromthetext A.Itcanmakethecapsmorefashionable. B.Itisstronglyopposedtobyallthedoctorsandnurses C.Itaimstoavoidmistakesandpoorcommunication. D.Itcanhelppeoplepasssomeglovesinatheatre. 3Whichofthefollowingbestexplainswerehumanunderlinedinparagraph3 A.We'regenerous. B.We'renegative. C.We'resatisfied. D.We'rekind. 4What'sthepatients'attitudetowardsthecampaign A.Supportive. B.Disapproving. C.Doubtful. D.Uncaring.
SupercomputerswhichcananalysebloodsamplesandpredictwhichpatientsarelikelytobecomeseriouslyillcouldsavetensofthousandsoflivesayearitwasrevealedlastnightaccordingtoTheDailyExpress. TheartificialintelligenceAIsystemdevelopedatUniversityCollegeLondonandsettobepilotedinNHShospitalslaterthisyearwillscreenatriskpatientssodoctorscantakeearlyactiontopreventdeathorseriousillness.ProfYoungaconsultantsurgeonatSouthendUniversityHospitalsaid:Iamsoexcitedaboutthisformoftechnology.Insteadofpeoplegettingsickordyingbecausetheyarenotpickedupintimethiswillallowustostepinearlierwhichwillsavelivesandanenormousamountofmoney.IthinkthepotentialofAIinhealthcarelikethisisasbigastheIndustrialRevolutionwas﹣andsignalsacompletelynewexampleinthewaywemanagehealthcare. ThetechnologyisthebrainchildofDrVishalNangaliaaconsultantattheRoyalFreeHospitalinLondon.HeusedAItoanalyseabillionstoredbloodsamplesfrom20differentUKhospitaltrustsdatingbackupto12years.Computersassessbloodtestresultsbypickingupsubtlechangesinredandwhitebloodcellssuggestingapatientisgoingdownhill. Hefoundthetechniqueforecastoutcomesofpatientswithkidneyproblemswithupto95percentaccuracy.Traditionalmethodshighlightingseriouspatientconcernspickedupasfewas16percentofpatientswhowentontodie.Thisgivesustheopportunitynotonlytosavelivesbuttopreventseriousillnessmakingthehealthservicenotonlysaferbutmoreefficient.ProfYoungsaidInsteadofwaitingforpeopletogetworsewewillbeabletotreatthemearlier. 1WhatdoestheunderlinedphrasescreeninParagraph2mean A.comfort. B.treat. C.spot. D.nurse. 2Howdosupercomputershelpsavelives A.Bystoringbloodsamples. B.Byanalyzingpatients'cases. C.Byobservingchangesinbloodcells. D.Byassistingdoctorswiththeiroperations. 3WhydidProfessorYoungmentiontheIndustrialRevolution A.ToshowtheinfluenceofAI. B.Tostresstheimportanceofhealthcare. C.Tointroducethetopicofsupercomputers. D.Topresenttheachievementhehasaccomplished. 4Whatdoweknowaboutthenewtechnology A.Ithelpspatientsrecoverearlier. B.Ithashelpedsavethousandsoflives. C.Itwillpromotethehealthservicegreatly. D.Itisintendedforpatientswithkidneydiseases.
DerekRabeloisnottheonlysurfertoconquerHawaii'sfamousPipelinebigwavebreakbutwhileallothersusetheirsighttodoitthisyoungprofessionalsurfermustrelyonlyonhisothersenses.That'sbecauseheiscompletelyblind. WhenDerekwasbornover24yearsagohegothisnamefromDerekHothefirstHawaiiansurfingworldchampion.AsurfingenthusiasthimselfErnestodreamedthathissonwouldsharethetalentofhisuncle.aprofessionalsurfer.UnfortunatelyDerekwasborncompletelyblindbutthisdidn'tstophisfamilyfrombelievingthathecoulddoanythinghewantedevenifthatmeantbecomingasurfer. Atage2DerekreceivedabodyboardandthebeachesofGuarapariBrazilbecamehisbackyard.Hewasalwayscomfortableinthewaterandsurfingwasinhisbloodbuthedidn'tactuallytryridingawaveuntilheturned17whenhisfatherboughthimasurfboard.HisfathertaughthimthebasicsandencouragehimtokeeppracticingbutaftersuccessfullystandinguponthesurfboardDerekknewheneededtobecomemuchbetterifhewasgoingtoachieveErnesto'sdreamandbecomeaprofessionalsurfer.SohejoinedthePraisdoMorrosurfschoolwherehestudiedundercoachFabioMaru. StandinguponasurfboardandconqueringsmallwavesisonethingwhilegatheringthecouragetotakeonHawaii'sboard﹣breakingPipelineisanother.Butthat'sexactlywhatDerekRabelosetouttodojustmonthsafterlearninghowtosurf.Everyonetoldhimitwastoodangerousbuthefelthecoulddoit.AndhedidearningthepraiseoffamousprofessionalsurferslikeKellySlaterandMickfanning.Now24RabelohasbeensurfingthePipelineeverywintersince. 1Whatdoesthefirstparagraphtellus A.Goodeyesightisnecessaryforbecominggoodsurfer. B.NobodyhaseverconqueredHawaii'sbigwavebreak. C.DerekRabelodreamstoconquerHawaii'sbigwavebreak. D.DerekRabeloistheonlyblindprofessionalsurfertoconquerHawaii'sbigwavebreak. 2HowdidErnestobehaveafterDerekwasborn A.Heneverlostconfidenceinhim. B.Henamedhimafterhisuncle. C.Hesenthimtosurfingchampion. D.Hestartedhisowninterestinsurfing. 3AfterDerekwasabletostanduponthesurfboardhe. A.begantotryridingawave B.wasnolongerafraidofwater C.realizedhestillhadalongwaytogo D.knewhisfathersdreamhadcometrue 4WhichofthefollowingwordscanbestdescribeDerekaccordingtothelastparagraph A.Skillfulbutproud. B.Braveandconfident. C.Courageousbutstubborn D.Thoughtfulandmodest.
XuLizhena74﹣year﹣oldladyhasbeenactingasatourguidefornearly20yearsinYangShuoGuiLin1isacityknownbothinChinaandabroadforitsbeautifullandscape2sheattendedonlyprimaryschoolwhenshewasyoungShecannowspeakapproximately11foreignlanguages3fluent. Since20yearsagotourists4showaffectionforYangShuoincludingagreatmanyforeignersInordertomakea5liveXuLizhenbegantosellwater.Howevershecouldhardlymakeanymoneyatfirstbecauseforeignersdidn'tunderstandheraccent.Shetriedtoimitatethe6pronounceoftheforeignerstakenotesandlearnthem7heart.IfshecameacrosstouristswhocanspeakbothChineseandaforeignlanguageshewouldaskthemtotranslatetheirwordsmanytimessothatshecouldrememberthem8well.Itisinthiswaythattheoldgrannymasters11languagessuchasEnglishFrenchRussianKorean.Nowshehasnodifficultyatall9communicatewithforeignfriendsinsimpleoralEnglish.Sheisalso10refertoasMotherMoonforherkindnessamongtourists.
将一张正方形的纸片按下图所示的方式三次折叠折叠后再按图所示沿MN裁剪则可得
Withoutreducingfunanyonecanhostabirthdaypartyonatightbudget.SanFranciscotheEastBayandSouthBayinparticulararefullofonlyfound﹣herelocationsthatcanmakethedayspecial.AdayatGreatAmericatourofSBCParkandabaseballgameoraprivatepartyattheOaklandChabotSpaceandScienceCenterareexperiencesuniquetoBayAreafamilies. Thesepartiesarethemostfunbecauseabudgetforcesyoutobecreativewithwhatyou'vegot.Thekeyhereistofindaspotthatisfreeorcheap. Afewplacestoconsiderarepublicparks﹣findoneswithage﹣appropriateplaystructuresthatarerelativelysafe.Inthesummerlocatealocalpoolwithplentyoflifeguardsandhavethosehandyparentscomealongasguests.Andasyouplanconsideryourguests'abilitiesandcomfortlevels.Ifyourchildlovestoice﹣skatebutherfriendshateitmaybeshecanchooseadifferentactivityormainlychoosetodothisasafamilybirthdayouting. Zoosarerelativelyinexpensiveaswell.TheSanFranciscoZoocharges﹩11peradultand﹩5foreachchildages3﹣11and﹩8for12﹣17.TheOaklandZooadmitsadultsfor﹩9andkids﹩5.50forages2﹣14. Museumsandaquariums水族馆oftenhaveafreeadmissionday.YoucantakekidstotheSteinhartAquariumforfreethefirstWednesdayofeachmonth.ThesamegoesfortheExploratoriumalsoinSanFrancisco.ThedeYoungMuseumisalsofreeforallvisitorsthefirstTuesdayofeverymonth.Italsochargesallkidsnothingwhoare12andunderdaily.Organizeyourfreemuseumdaysduringschoolbreaksorholidaysandyou'llsavealot. 1WhatcanyoudoattheOklandChabotSpaceandScienceCenter A.Holdaparty B.AdmireGreatAmerica C.Watchanationalbaseballgame D.LearnaboutthehistoryofSanFrancisco 1Whichofthefollowingisalwaysfreeforakidunder12 A.TheOaklandZoo B.TheExploratorium C.TheSanFranciscoZoo. D.ThedeYoungMuseum 3Whattypeofwritingisthistext A.Abudgetreport B.Atravelguide. C.Abookreview D.Amuseumbrochure
不等式﹣x+1＞0的正整数解是．
AtthefarendofIslingtonRoadinNewtonMassachusettslivesalittlegirlnearanddeartotheneighborhood.Two﹣year﹣oldSamanthaSavitzis1butshelovestotalktoanyonewhoknowssignlanguage.Andherwholepersonalitychangeswhenit'ssomeonewhocan2withher. Herdesireforcommunicationhasbeen3obvioustoeveryoneintheneighborhood.WheneverSamtriestobeneighborlythey4themselveslostforwords.Sotheyneedto5morethanabasicconversationwiththechildinthecommunity. Unfortunatelythisisn'tsomethingyoucan6withease.You'dneedthewholecommunitytolearnsignlanguage7foralittle2﹣year﹣oldgirl.Youcan't8neighborstodothat.Youcanonlyappreciatethemwhentheydo. OntheirownSam'sneighborsgottogether9aninstructorandarenowfully10anAmericanSignLanguageclass.Eventheparentsofdeafchildrendon't11tolearnsignlanguage.NowSamhasawhole12tocommunicatewithher. Andthislevelofinclusionwillalmostcertainlyguaranteeahappiermore13Sam.Herparentssaystherearen'twordsinanylanguagetoexpresstheir14.Infactthey'realreadyseeinga15intheirdaughter.Thefirstthingshesaystousis‘friend'saidhermotherIthinkyourheartwould16justasminedid. SometimesitfeelslikeAmericaislosingits17ofcommunity﹣butthenyouhearaboutaplacelikethiswhereittakesawholevillageto18achild.Nowthevillageisaliveandishereto19usthatwhatmakesagoodneighborhoodisnothingmorethangood20. 1A.blind B.deaf C.lame D.dull 2A.communicate B.sing C.play D.quarrel 3A.cheerfully B.peacefully C.painfully D.doubtfully 4A.make B.find C.let D.have 5A.strikeup B.putoff C.gothrough D.takein 6A.confirm B.trust C.discover D.solve 7A.still B.even C.just D.also 8A.educate B.expect C.wish D.help 9A.trained B.taught C.hired D.dismissed 10A.trappedin B.involvedin C.awareof D.equippedwith 11A.agree B.plan C.promise D.bother 12A.school B.community C.family D.club 13A.well﹣fed B.well﹣known C.well﹣behaved D.well﹣adjusted 14A.sympathy B.dilemma C.gratitude D.love 15A.complaint B.fault C.difference D.commitment 16A.melt B.race C.break D.burst 17A.control B.credit C.sign D.sense 18A.raise B.feed C.tell D.request 19A.urge B.warn C.guide D.remind 20A.neighbors B.friends C.partners D.colleagues
72hoursinBeijing TravelingtoChinaisnolongeraluxuryformanyforeignpassportholders.TheChinesegovernmenthaspermitteda72﹣hourvisa﹣freepolicythatoffersaccesstovisitorsfrom53countriesincludingtheUSFranceandAustria.LetsstartwiththecapitalofChinaBeijingHere'sapickofthebestinBeijing! MutianyuGreatWall YourtriptoBeijingisn'treallycompletewithoutseeingoneoftheNewSevenWondersoftheWorldtheGreatWallofChinaTheMutianyusectionoftheGreatWallisbyfarthemostwell﹣preservedofall.TakingaonehourbusrideMutianyuwouldbeyourideallocationforahalf﹣dayofhikingawayfromthelargecrowdsinthecity.AlsotheauthoritieshaveallowedtouriststopaintgraffitionaspecificsectionoftheGreatWallsince2014.TheGreatWallwasdesignatedaUNESCOWorldHeritagesitein1987. 798ArtZone Thiswouldbeonthetopofmylist!Namedafterthe798factorythatwasbuiltinthe1950stheartzoneishometovariousgalleriesdesignstudiosartexhibitionspacesfashionableshopsandbars.Youcouldeasilyspendhalfyourdaywanderingaroundthecomplexfeelingthecontrastofthepresentandthepast. SummerPalace LocatedinnorthwesternBeijingtheSummerPalaceisbyfarthecity'smostwell﹣preservedroyalpark.WithitshugelakeandhilltopviewsthepalaceoffersyouapastoralescapeintothelandscapeoftraditionalChinesepaintings.TheSummerPalacewasaddedtotheUNESCOWorldHeritageListin1998. SichuanProvincialRestaurant WhileinBeijingapartfromtryingthecity'sbest﹣knownPekingducktheSichuanprovincialrestaurantisoneofplaceswhereyoucanenjoyregionaldeliciousfood.ItoffersoneofChina'seightgreatcuisinesSichuanwhichrangesfromMapotofutospicychicken. 1WhichofthefollowingistrueabouttheMutianyuGreatWall A.Itisthemostwell﹣preservedpartoftheGreatWall. B.Youcanpaintgraffitianywhere. C.Youneedahalf﹣daytogetthere. D.ItwasdesignatedaUNESCOWorldHeritagesitein2014. 2WhenwastheSummerPalaceaddedtotheUNESCOWorldHeritageList A.In1950. B.In1987. C.In1998. D.In2014. 3WhichplaceistheauthorsfirstchoicewhenvisitingBeijing A.MutianyuGreatWall. B.SummerPalace. C.798ArtZone. D.SichuanProvincialRestaurant.
1解方程+＝2 2如图在菱形ABCD中AE⊥BC于EAF⊥CD于F．求证△ABE≌△ACF．
It'sonceagainbeendeclaredtheworld'smostpopularmuseum.1.itmaynotbea2 thingfortheLouvre卢浮宫inParis. Themuseumbrokeitsown3in2018welcoming10.2million4andclaimingthetopspotinanindexoftheworld'smost﹣visitedmuseums. ButtheLouvre'suptick小幅上升invisitorsis5toomuchformanyofitsworkers 6byreceptionandsecuritystaffoverthenumberoftourists7throughitsdoorshavehitopeninghoursthroughouttheweek. TheLouvreissuffocating令人窒的theworkersunionsaidinastatement.Thepublichasincreasedbymorethan20%since2009butthepalacehasnotgrownit8. Themuseumwas9onMondayandopenedlaterthanadvertisedonWednesdayduetoa10withthedissatisfiedworkers.visitorshave11outsidethebuildingthroughouttheweekandthosewithoutbookingshavebeen12. Althoughtensionswithitsworkers13themuseum'sbottomlineislooking14.TheLouvrebrokeits201215recordlastyearmarkingadramatic16fromasharpdownturninvisitsin2017thatwasduetoasuddendecreasein17inParis. Thesocialmediathatare18aboutBeyoncéandJayZ'smusic19filmedatthemuseummayhaveplayedintothatincrease. ButwhilevisitornumbersroseattheLouvreoverallattendancewasrelatively20amongthetop20museumsintheworldlastyear.Attendancegrewamongthetop20byjust0.1%from2017to2018. 1A.Moreover B.However C.Finally D.Eventually 2A.splendid B.skeptical C.tough D.sad 3A.promise B.rule C.record D.law 4A.musicians B.artists C.visitors D.volunteers 5A.acquiring B.suffering C.blaming D.proving 6A.strikes B.quarrels C.fights D.contests 7A.flooding B.jumping C.crawling D.slipping 8A.stopped B.added C.started D.paused 9A.decorated B.repaired C.visited D.closed 10A.lecture B.meeting C.speech D.lesson 11A.queued Bdined C.helped D.served 12A.turnedup B.turnedover C.turnedaway D.turnedon 13A.dieout B.payoff C.fadeaway D.goon 14A.healthy B.funny C.tiny D.cozy 15A.quality B.attendance C.photo D.worker 16A.alarm B.attack C.recovery D.prediction 17A.paintings B.products C.population D.tourism 18A.innocent B.selfish C.crazy D.generous 19A.concert B.video C.festival D.industry 20A.high B.huge C.round D.flat
黑白两种颜色的正六边形地砖按如图所示的规律拼成若干个图案则第n个图案中有白色地砖块．用含n的代数式表示
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; 只允许修改10处多者从第11处起不计分. TosupporttheactivitynameGreenTravelStartwithMeItalktomyparentsaboutmyideas.Theywereverysupportivesaytheywouldnotdriveworkfromthenon.InthefollowingweeksastheypromisedIwenttoschoolbybikeeverydaywhilemyparentswenttoworkbybus.Thoughweweretiredbutweallfelthappily.LastFridaytheclassmeetingwasheld.Someparentswereinvitedincludingmyfatherandmother.Wesharedourthoughtduringthemeeting.Allofusheldthesameviewwhichenvironmentalprotectionissoimportantforourlife.
Outof89sitesgivenspecialprotectionduetothequalityoftheirlandscapeplanningpermissionforturbines轮机hasbeenapprovedat14. AffectedareasrangefromCornwalltotheLakeDistricttheOuterHebridesandtheShetlandIslands.Peopleclaimthattheprojectswouldspoilmuch﹣lovedviewsandhavecalledforclearerrulesonwherewindfarmscanandcannotbebuilt. Environmentalistshavecalledforachangeintheplanningsystemandsaythecurrentarrangementhasledtoafree﹣to﹣allamongwindfarmdevelopersInCornwallplanstobuild20turbineseach415ftinheight﹣tallerthanBigBenorStPaul'sCathedral﹣onlandnexttoBodminMoorhavebeenapprovedbythelocalcouncildespiteoppositionfromFriendsoftheEarththeRSPBandNaturalEngland.ExpertshavesaidtheturbineswillbevisiblefrommuchofBodminMoorandwillhaveahugeimpactonadistinctiveareaoflandseape. Theareaisalsohometomorethanonemillionstarlings八哥鸟andtothousandsofgoldenplover千鸟aprotectedspecies.Conservationistsestimatethat16000starlingsanddozensofgoldenploverwouldbekilledeveryyearbytheturbines ArthurBoytthechairmanoftheStopTurbinesinNorthCorwallcampaigngroupsaidThisareaofCornwallisfamousforthesceneryandtheviews.Itisawildandbeautifulareaofcountryside.Thewindfarmwouldviolatewhatisaverypeacefuldistinctandbeautifullandscapeandreduceittoinsignificancebehindthoseturbines. ButCharlesAnglinoftheBritishWindEnergyAssociationwhichrepresentstheindustrysaiddecisionsshouldbemadeonacase﹣by﹣casebasis. HesaidhebiggestthreattotheUk'sandtheworldshabitatsandwildlifeisdisastrousclimatechange.Todoanythingaboutthatwehavetochangethewayweuseandproduceenergyandthatdoesmeanexpandingtheamountofrenewableenergyweuse. Thelocalimpactisveryimportantbutit'spartofthewiderimpact.Wewouldbeshootingourselvesinthefootifwerejectedwindoutofhandbecauseofpurelylocalconsiderations. 1Accordingtothepassagewhatwillbeinfluencedbythebuildingofturbines A.Thelivingplacesoflocalanimals. B.Quietandnaturalscenery. C.Beautifullandscape. D.Alloftheabove. 2ThepurposeofmentioningtwofamouslandmarksBigBenandStPaul'sCathedralisto. A.makeadvertisementsforBritishtourism. B.showhowhighthesetwobuildingsare. C.comparetheheightofturbinestothem. D.expresstheauthorssurpriseattheheight. 3WhatcanweInferfromCharlesAnglinswords A.Anaturaldisasteriscoming. B.Theimpactshouldbeconsideredfirst. C.Weshouldmakedecisionsbasedontheconditions. D.Expansionofrenewableenergyisthesolutiontoclimatechange. 4What'sthemainideaofthepassage A.ClimatechangeonEarthistooserious. B.Peoplecallforrulesonthebuildingofturbines. C.BuildingturbineshasarousedargumentsinBritain. D.Alotoforganizationsaretakingactionstoprotectourenvironment.
能表示如图所示的一次函数图象的解析式是
小明和小刚用如图所示的两个转盘做游戏游戏规则如下分别旋转两个转盘当两个转盘所转到的数字之积为奇数时小明得2分当所转到的数字之积为偶数时小刚得1分．这个游戏对双方公平吗若公平说明理由．若不公平如何修改规则才能使游戏对双方公平
画一个正方体的三种平面展开图要求展开图是中心对称图形． 画出的图是正方体的展开图但不是中心对称图形每种可得2分．
DaveMerryandhistoolshavebeenthroughalottogether.ThetoolshelpedDavenow80repairhishomeinSt.PaulMinnesotawhereheandhiswifeAnnetteMerrylivedfor46yearsandraisedthreechildren.Thetablesawthejointerplanethedrillpressandthedozensofotherpowerandhandtoolshadprideofplaceinhiscarefullyorganizedworkshop.'Ihadawholesetupanditwasbeautiful'saysDavearetiredengineer.ButthenAnnetteexperiencedastroke中风thatleftherrelyingonawalkertogetaroundandtheMerrysdecidedtomoveintoassistedliving.Dave'sworkshopwasobviouslyaminorconsiderationgivenAnnette'sconditionbutthefamilyknewthatgivingitupontopofeverythingelsewouldhurt.ItwastheMerrys'daughterwhocameupwithapossiblesolution.She'dheardaboutsomepeoplewhoweresettingupatoollibrary﹣anonprofitfacilitythatwouldlendouttoolsjustasaregularlibrarylendsbooks.MightDadbeinterestedindonatinghis'Isaidyes'Davesays.ThepeoplecreatingtheSt.PaulToolLibrarywerethrilled.Theyhadexpecteditwouldtakeayeartocollectenoughtoolstomaketheirfacilityfullyfunctional.Insteadittookoneday:thedayDavedonatedhis.Thelibrary'sfoundersdroveovertotheMerrys'houseandpickedeverythingupthemselves.ThelibraryishousedinthebasementoftheAmericanCanFactory.Memberspayanannualfeefrom﹩20to﹩120forunlimitedtooluseandavaryingnumberofvisitstotheworkshop.Andtheygetanextrabenefit:DaveMerry.'Almosteverytimewe'reopenDave'shere'saysoneofthefoundersPeterHoh.'Itmeansalottometobeabletogoandusemytools'Davesays.'ButitmeansjustasmuchtohelpDIYersusethetoolsproperly.'AsHohputsit'Thisishisworkshopnow.'1WhatdoweknowaboutDaveMerryA.HehadfewDIYtools.B.Hekepthistoolswell.C.Heownedatoollibrary.D.Heusedawalkingstickafterstroke.2HowdidthedaughterhelpherparentsA.ShetookoverDad'sworkshop.B.SheofferedDadusefulinformation.C.Shemovedthemintoassistedliving.D.ShesoldDad'stoolstoatoollibrary.3WhatisavailabletothevisitorstotheSt.PaulToolLibraryA.Freeuseofthetools.B.AvisittotheMerrys'house.C.Dave'sinstructionsforusingthetools.D.Hoh'sshareoftheprofitfromthelibrary.4WhatcanbeasuitabletitleforthetextA.ArtofLivingB.SettingupaLibraryC.AFamily﹣runLibraryD.RecyclingThroughDonating
把两个全等的直角三角板ABC和EFG叠放在一起使三角板EFG的直角顶点G与三角板ABC的斜边中点O重合其中∠B＝∠F＝30°斜边AB和EF长均为4． 1当EG⊥AC于点KGF⊥BC于点H时如图①求GHGK的值 2现将三角板EFG由图①所示的位置绕O点沿逆时针方向旋转旋转角α满足条件0°＜α＜30°如图②EG交AC于点KGF交BC于点HGHGK的值是否改变证明你发现的结论 3三角板EFG由图①所示的位置绕O点逆时针旋转一周是否存在某位置使△BFG是等腰三角形若存在请直接写出相应的旋转角α精确到0.1°cos73.2°≈0.29若不存在说明理由．
WealwaysknewourdaughterKendallwasgoingbeaperformerofsomesort.She1peopleinoursmalltownbyputtingonshowsandsingingonourfrontporchwhenshewasonlythreeorfour. WhenKendallwasfivewebeganto2thatshewasblinkingalotandclearingherthroat3.Wehadhertestedforallergiesbutthedoctorsaidshewasn'tallergictoanythingatall.Aftertheproblem4wetookhertoourlocalchildren's5whereshewasdiagnosedwithTourette'sSyndrome. Itwasprettydevastating令人悲痛的becauseotherchildrenconstantlymadefunofherandsadlyevenateacher6her.Sheonlyhadoneortwofriendsbutthatwasokaybecausetheywere﹣﹣andcontinuetobe﹣﹣realthekindwho7hernomatterwhat.ThroughallthisKendallcontinuedtosingandentertain.Toour8herproblemdisappearedwhenshesang. In2005whenKendallwassixteen.wethoughtshewasprettymuchoutofthewoods﹣oratleastheadinginthatdirection9asifTourette'sSyndromewasn'tenoughforabeautifulyounggirltodealwithastrangeaccidenthappenedAtabirthdaypartyKendallwasseriouslyhurtinagameandwas10tothehospitalwhereshespentthenextweekparalyzedfromtheneckdown.Ironicallyherbiggest11wasn'twhethershewouldwalkagainbutwhethershewouldbeabletoaudition试镜forAmericanIdol. Sometimesweall12becauseofthepainwewitnessedButonthedayKendallwalkedintothestadiumtoauditionforAmericanIdol﹣an13threemonthsafterheraccident﹣wecriedtearsof14.AndourtearsturnedintoshoutswhenshewasgivenagoldentickettoHollywood. Kendalliseighteennowlivingeverydaytoits15.She'srecordedaCD.She'salsoonCMT'sMusicCityMadnessforanoriginalsongandvideoandishavingsomegoodsuccess. Whenshewasalittlegirltryinghardtobestrongshelooked16atme.herbigeyesfilledwithtearsandaskedmewhyshehadtohaveTourette'sSyndrome.Myheart17tomaketheworldrightformychild.ButIlookedrightbackatherandtoldherthe18asIseeit. KendallGodgaveyoua19heartanangelicvoiceastrongmindandabeautifulappearance.Withallofthat.hehadtomakeit20foreveryoneelse. 1A.treated B.entertained C.attracted D.showed 2A.notice B.know C.assume D.predict 3A.regularly B.fluently C.loudly D.frequently 4A.improved B.changed C.worsened D.arose 5A.school B.hospital C.museum D.charity 6A.helped B.comforted C.abused D.teased 7A.stickby B.turnto C.lookafter D.associatewith 8A.luck B.sorrow C.delight D.disappointment 9A.Therefore B.However C.Anyway D.Besides 10A.walked B.accompanied C.rushed D.invited 11A.concern B.dream C.problem D.disease 12A.laughed B.worried C.panicked D.cried 13A.mere B.uneasy C.precious D.desperate 14A.sadness B.despair C.joy D.regret 15A.happiest B.fullest C.simplest D.busiest 16A.down B.around C.forward D.up 17A.ached B.relieved C.lightened D.moved 18A.way B.story C.news D.truth 19A.sick B.broken C.pure D.fragile 20A.right B.similar C.different D.fair
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和修改. 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. DearTom HowisitgoingKnowingthatyouareinterestinginChinesecalligraphyI'mwritingtotellyouit'smypleasuretohelpyoulearnthem. AsIhavebeenpracticingitformanyyearsIhavemuchvaluableexperienceandknowexactwhatyouneedforcalligraphy.SoIwillpreparesometoolthatareofgreatuseforyoulikethewritingbrushinkandpaperthatarenecessaryforpracticingcalligraphy.AsyouknowIhadpianolessonsfromMondaytoSunday.IwillbefreeonSundayafternoon.Thusyoucancometomyhomeat2:00p.m.oneverySundayifitisconvenientforyou. I'msurethatbylearnChinesecalligraphyyouwillhaveagoodunderstandingofChineseculturethaneverbefore.I'mlookingforwardyourreply. Yourssincerely LiHua
假如你是李华你的笔友Peter听说高考即将来临想了解一下你们如何备战高考请你回一封邮件说明相关情视内容包括: 1.想方设法掌握知识; 2.保持精力充沛 …… 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. DearPeter Iammorethandelightedtohearfromyou. Lookingforwardtoyourearlyreply! Yours LiHua
IntheworldofdigitalhealthSiliconValley﹣basedMindstrongstandsout.Ithasaremarkableteamandtensofmillionsoffunding.Italsohasafascinatingidea﹣itsappbasedonmentalfunctioningresearchcanhelpdetecttroublingmentalhealthpatternsbycollectingdataonaperson'ssmartphoneusage﹣howquicklytheytypeforinstance. Thecompany'sappcollectsinformationabouthowpeoplearetypingandrunsitthroughamachinelearningalgorithm计算程序todeterminewhichdatacanpredicttheiremotionalstate.Theideaistousethatdatatoestablishanormalpattern﹣soitcanbecomparedwithsomeone'stypinghabitsonanygivenday.Ifthehabitschangeslowerormoreanxiousthannormaltheappcanwarnahealthcareprovider. ThepromiseofthistechnologyhasmadeMindstrongincrediblypopularsinceitwaslaunchedlastyear;alreadymorethanadozencountiesinCaliforniahaveagreedtoapplythecompany'sapptopatients.DoestheappliveuptoitspromiseThere'snowaytotell.Almostnooneoutsidethecompanyhasanyideawhetheritworksleadingsomeexpertstowonderifthetechnologyisreadyfortherealworld.Iwouldn'twasteallthattimeandmoneyinthewilduntiltheygetsurethatsomeofthosethingsareasspecificastheyhopetheyaresaidRosalindPicardaresearcheratMITMediaLabwhoisfamiliarwithMindstrong'swork. Ithaspassedthegold﹣standardclinicaltestsfordepressionandanxietysaidDr.PaulDagumthecompany'sfounder.We'reconfidentandwe'realreadyseeingsomereallyexcitingresults.Mindstrongofficialssaidthatamongtheirmostencouragingresultsisthatitsappcanevenpredicthowapersonwillfeelnextweekkindoflikeaweatherappforyourmood.Foraclinicianorsomeonelookingafterapatienttheyknowthatitcouldbeveryverypowerful.Dagumsaid. 1WhatcanMindstrongsappdo A.Improveitsusers'mentalhealth B.Getitsuserstotypemorequickly. C.Discoveritsusers'mentalstate. D.Workoutthecausesofitsuser'trouble 2Whatisthesecondparagraphmainlyabout A.Thewaysofcollectingdata. B.Theapp'sworkingprinciple. C.Theanalysisoftypinghabits D.Thedevelopmentoftheapp 3WhatisRosalindPicard'sattitudetowardstheapp A.Skeptical B.Positive C.Uncaring D.Defensive 4WhatcanweinferaboutDagum'sopinionontheapp A.Theapphasapowerfuleffectonanxiety. B.Theappcanalsopredictweatherconditions. C.Careproviderscouldbeadvocatesoftheapp. D.Doctorsbenefitmorefromtheappthantheirpatients.
假定你是李华你的美国朋友Peter正在你们学校开展为期两周的交流活动.请你给他写封邮件邀请他一起去郊游欣赏中国美丽乡村.内容包括: 1.时间和地点; 2.特色乡村文化体验如赏美景看演出品美食等 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
WhenIwasaboyourextendedimmigrantfamilywouldsometimesgatheratmyaunt'stinyhouseoverthesummer.Relativesfromalloverthecountrywouldcomeintovisit.Theadultswouldcrowdtogetherinthelivingroomtotalkandcatchuponeachother'slives.Andthekidswouldbesentoutintothefrontyardtoplaywhendinnerwasslowlycookedforallofus. Thosewerethedaysbeforevideogamessmartphonesandmotorizedtoyssoweoftenendedupplayinganoldgame.Irememberoneofthosemomentsespecially.AsIwastheyoungestandsmallestofallthekidsthereIgotcaughtfirstandcouldn'tcatchanyoneelse.MybrothersandcousinswerealltoofastformeandIgrewmoreandmorefrustrated.Ifinallyfellmyfacefirstintothedirt.Igotupwithtearsforminginmyeyes.ThenIsawoneofmyfemalecousinsSusanstandingthere.Shestartedtorunbutwasgoingmuchslowerthanbefore.Ieasilycaughtupandseizedher.ThensheturnedtomesmiledandsaidI'mit!Youdbetterrun!Iranofflaughingwithgleewhilesheturnedandstartedtochaseothers. NowIseehowheractofkindnessthatdaysavedmefromsadnessandreturnedmetojoy.Itdidn'tmatterthatwehardlyeversaweachother.Iknowwearefamilyandshelovesme. Inherwonderfulbook:BoxofButterfliesRomaDowneywritesWearealloneweallbelongtoeachotherandweareonebig.beautifulfamily.Perhapsitistimethatweallstartedtotreateachotherthatway.Perhapsitistimethatwesharedourloveourkindnessourlaughterandourjoywitheveryonewithoutfear.Perhapsitistimetofinallyandforeverbringthisworldtogetherinonebigfamilyreunion. 1Whentheadultswerechattingthekidswould. A.playvideogames B.sitinthefrontyard C.learntocookdinner D.playtraditionalgames 2TheauthorwasabletocatchSusanbecause A.theothersrantoofast B.theauthorwasgoodatrunning C.Susangaveherachance D.Susanwantedtochaseothers 3Whatcanbeinferredfromthepassage A.TheauthorisgratefulforhatSusandidtoher. B.TheauthorcantmeetSusananymore. C.Theauthorurgesotherstolovetheirfamily. D.Theauthorbelievestheworldwillbecomeabigfamily 4Whatcouldbethebesttitleofthepassage A.Amemoryofmychildhood. B.Sharingofgoodnessunitesus C.Kindnessbrightensourlife. D.Agooddeedisinvaluable
如图作等边△ABC取AC的中点D以AD为边向△ABC形外作等边△ADE取AE的中点G再以EG为边作等边△EFG如此反复当作出第6个三角形时若AB＝4整个图形的外围周长是．
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
当x＜时，y随x的增大而减小 当－1＜x＜2时，y＞0 
湘公网安备 43130202000226号