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如图,在△ABC中,∠ABC=90°,D为AC延长线上一点,且AD=2,BD=,sin∠ADB=. (1)求AB的长度; (2)求△ABC的面积.
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高一下学期数学《》真题及答案
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如图△ABC中AB=4AC=5D是BA延长线上一点E是∠CAD平分线上一点且EB=EC过点E作EF⊥
.如图在△ABC中AB=BC∠ABC=90°F.为AB延长线上一点点E.在BC上BE=BF连接AEE
如图在△ABC中∠ABC=90°D.是BC边延长线上一点且CD=CA∠ADC=15°CD=6求AB的
如图在△ABC中∠ABC=90°BC=3D.为AC延长线上一点AC=3CD过点D.作DH∥AB交BC
如图在等腰Rt△ABC中∠ABC=90°AB=BCD.为斜边AC延长线上一点过D.点作BC的垂线交其
小明在学习三角形知识时发现如下三个有趣的结论在Rt△ABC中∠A.=90°BD平分∠ABCM.为直线
小明在学习三角形知识时发现如下三个有趣的结论在Rt△ABC中∠A.=90°BD平分∠ABCM.为直线
如图△ABC中∠A.=60°P为AB上一点Q.为BC延长线上一点且PA=CQ连PQ交AC边于D.PD
如图在△ABC中AC=BC∠ACB=90°点D.为△ABC内一点∠CAD=∠CBD=15°E.为AD
如图△ABC中AB=ACD是CA延长线上的一点且∠B=∠DAM.求证AM∥BC.
已知如图△ABC中D.是AC的中点E.是线段BC延长线上一点过点A.作BE的平行线与线段ED的延长线
已知△ABCAB=AC=4BC=2.点D.为AB延长线上一点BD=2连结CD则△BDC的面积是___
如图在△ABC中AB=AC∠A.=30°E.为BC延长线上一点∠ABC与∠ACE的平分线相交于点D.
如图在菱形ABCD中∠ABC=60°E.是对角线AC上任意一点F.是线段BC延长线上一点且CF=AE
如图在Rt△ABC中∠ACB=90°CA=CBD是AC上一点E在BC的延长线上且AE=BDBD的延长
已知如图在Rt△ABC中∠C.=90°∠ABC=60°AC=D.为CB延长线上一点且BD=2AB.求
小明在学习三角形知识时发现如下三个有趣的结论在直角△ABC中∠A.=90°BD平分∠ABCM.为直线
如图在△ABC中AB=AC∠
= 30°,E.为BC延长线上 一点,∠ABC与∠ACE的平分线相交于点D.,则∠D.等于 A.15°
17.5°
20°
22.5°
如图3在△ABC中D.是AC边延长线上的一点∠A.=36°∠B.=62°则∠BCD的度数为_____
如图在△ABC中AC=BC∠ACB=90°点D.为△ABC内一点∠CAD=∠CBD=15°E.为AD
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1Youprobablythinkyouwillneverbeatopstudent.Thisisnotnecessarilysohowever.Anyonecanbecomeabetterstudentifheorshewantsto.Here'show Planyourtimecarefully.Whenplanningyourworkyoushouldmakealistofthingsthatyouhavetodo.Aftermakingthislistyoushouldmakeascheduleofyourtime.Firstyourtimeforeatingsleepingdressingetc.Thendecideagoodregulartimeforstudying.2Aweeklyschedulemaynotsolveallyourproblemsbutitwillforceyourealizewhatishappeningtoyourtime. Findagoodplacetostudy.Lookaroundthehouseforagoodstudyarea.Keepthisspacewhichmaybeadeskorsimplyacornerofyourroomfreeofeverythingbutstudymaterials.Nogamesradiosortelevision.Whenyousitdowntostudyconcentrateonthesubject. Makegooduseofyourtimeinclass.3Listeningcarefullyinclassmeanslessworklater.Takingnoteswillhelpyourememberwhattheteachersays. Studyregularly.Whenyougethomefromschoolgooveryournotesreviewtheimportantpointsthatyourteacherisgoingtodiscussthenextdayreadthatmaterial.4Ifyoudothesethingsregularlythematerialwillbecomemoremeaningfulandyou'llrememberitlonger. Developagoodattitudetowardstests.Thepurposeofatestistoshowwhatyouhavelearnedaboutasubject.Theyhelpyourememberyournewknowledge.Theworldwon'tendifyoudon'tpassatestsodon'tbeoverworried. 5Youwillprobablydiscoverthemafteryouhavetriedthese. A.Thereareothermethodsthatmighthelpyouwithyourstudying. B.Don'tforgettosetasideenoughtimeforentertainment. C.Takeadvantageofclasstimetolistentoeverythingtheteachersays. D.Noonecanbecomeatopstudentunlessheorsheworkshard. E.Maybeyouareanaveragestudent. F.Makefulluseofclasstimetotakenotesofwhattheteachersaysinclass. G.Thiswillhelpyouunderstandthenextclass.
Eatricebrew酒酿inclass?Youmustbejoking.Butthat'swhathappenedinHefeiHupoMiddleSchoolinAnhui.Junior2studentstheremadetheirownricebrewtolearnaboutfermentation发酵. Thestudentshavealreadylearnedthelessoninclass.Buttheywon'treallyunderstandituntiltheymaketheirownbrewsaidLiangWentheirbiologyteacher. Studentsmadethebrewingroups.Theyfirstboughtyeast酵母andcookedtherice.Thentheymixedthericeandyeastcarefullytogetherinabigcleanbowl.Themostimportantthingistoputthebowlinawarmplace.Yeastworksbestthere.That'sthesecretofagoodricebrew!Afteraboutaweekthericebecomesricebrew. Ourbrewlookssodelicious.Icouldn'twaittotasteit!saidXiYiwena14﹣year﹣oldgirl.ButXihadtowaitbecausetheyhadtoeatitatthetastingparty.Duringthepartytheteacherheatedupeachgroup'sricebrewforeveryonetotaste.Thestudentsthenchoseonegroupasthebestbrewmaker. Somegroup'sbrewwaspopularandsooneatenupbutsomewassourandtastedterrible!Somestudentsevenboughtnewbrewbecausetheyfailedtomaketheirown. Workingtogetherbroughtushappinessnomatterwhattheresultwas!saidWangYajuna=15﹣year﹣oldgirl.Hergroupwasthebestintheclass. 1Putthefollowingstepsinthecorrectorder a.thericebecomesricebrew b.buyyeast c.putthebowlinawarmplace d.cooktherice e.mixtheyeastandricecarefullyinacleanhowl A.a﹣b﹣c﹣d﹣e B.b﹣a﹣c﹣d﹣e C.b﹣d﹣e﹣c﹣a D.b﹣d﹣a﹣e﹣c 2Theteacheraskedthestudentstomakebrewbythemselvesbecause. A.theteacherlikedtoeatricebrew B.theteacherwantedthestudentstofindoutaboutfermentationthemselves C.theteacherwantedtomakethestudentsworkharder D.theteacherwantedtofindoutwhomakesthebestbrew 3Somestudentshadsourbrewprobablybecause. A.theydidn'tgetthebestyeast B.theywantedtobuybrewfromsupermarkets C.theydidn'tputthebowlintherightplace D.theydidn'tcookenoughrice 4Thebesttitleforthispassageis. A.Afunlessonaboutfermentation B.Howtomakericebrew C.Thehappinessofworkingtogether D.Scienceoffermentation
计算﹣12019+×sin60°﹣﹣3.
下列说法正确的是
某公司有如图所示的甲乙丙丁四个生产基地.现决定在其中一个基地修建总仓库以方便公司对各基地生产的产品进行集中存储.已知甲乙丙丁各基地的产量之比等于4542各基地之间的距离之比abcde=23433因条件限制只有图示中的五条运输渠道当产品的运输数量和运输路程均相等时所需的运费相等.若要使总运费最低则修建总仓库的最佳位置为
Ihavealwaysthoughtofmyselfasadoer.InworkIcertainlywasandcontinuetobe.AsamomI'mmostlyadoer.Howevermy1forbreastcancermademe2Ihadn'tbeenadoerinthewayIwantedtobe﹣butthatwasaboutto3. SinceIbecamea4andreportedmanyplanecrashesI'vebeen5offlying.Myfamilyhad6beentoanothercontinenttogether.Nowthatthechemo化疗7asagifttomyselfmykidsandmymomItookthemalltoLondonto8lifebeforebeginningradiationeveryweekdayforsixweeks. ThistimeImadea9nottothinktoomuchaboutit.Lookinginthemirrorwithouthairyoudoyourbestto10yourdayasthoughitwereaday11youdiscoveredyourlump肿瘤.Theneverythingseemsdoable.12Ijustbookedthetrip.InLondoneverydayI13adifferentadventurefromwhichmyfamilyandIlearnedmuchand14ourselves. Ihadwantedtotakea15likethisforyearsbutlifeandworkhadgottenintheway.Now16lifeandworkwehadfinallydone17.Ihavethoroughlyenjoyedfamilylearning18livingbutnothingisbetterthanknowingthatmykidsfeel19forthetrip.Onedayperhapsthey'llrealizethatsometimesthebest20comesaftersurvivingyourgreatestfears. 1A.treatment B.reason C.concern D.anxiety 2A.ignore B.imagine C.realize D.doubt 3A.happen B.continue C.change D.arise 4A.pilot B.doctor C.tourist D.journalist 5A.tired B.fond C.afraid D.proud 6A.frequently B.already C.never D.just 7A.failed B.ended C.delayed D.approached 8A.save B.create C.celebrate D.improve 9A.wish B.decision C.judgment D.conclusion 10A.lookfor B.getridof C.lookbackon D.getthrough 11A.after B.before C.until D.when 12A.But B.So C.Otherwise D.Even 13A.expected B.planned C.experienced D.described 14A.enjoyed B.taught C.introduced D.trained 15A.rest B.lesson C.risk D.trip 16A.intermsof B.owingto C.regardlessof D.inadditionto 17A.them B.it C.everything D.something 18A.for B.by C.with D.beyond 19A.grateful B.eager C.ready D.sorry 20A.work B.chances C.love D.adventures
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分解因式x2+2x+1=.
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SowhyhasEnglishchangedovertime?1actualalllanguageschangeanddevelop2culturesmeetandcommunicatewitheachother.AtfirsttheEnglishspokeninEnglandbetweenaboutAD450and1150wasverydifferentfromtheEnglish3speaktoday.ItwasbasedmoreonGerman4theEnglishwespeakatpresent.ThengraduallybetweenaboutAD800and1150Englishbecame5littlelikeGermanbecausethosewho6ruleEnglandspokefirstDanishandlaterFrench.ThesenewsettlersenrichedtheEnglishlanguageandespecially7itvocabulary.Sobythe1600'sShakespearewasabletomakeuseof8widervocabularythaneverbefore.In1620someBritishsettlersmovedtoAmerica.Laterinthe18thcenturysomeBritishpeople9taketoAustraliatoo.Englishbegantobespokeninboth10country.
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为了测量某山如图所示的高度甲在山顶A测得C处的俯角为45°D处的俯角为30°乙在山下测得CD之间的距离为400米.已知BCD在同一水平面的同一直线上求山高AB.可能用到的数据≈1.414≈1.732
下列运算正确的是
Differentweathermakespeoplefeeldifferent.Itinfluences影响healthintelligence智力andfeelings. InAugustitisveryhotandwetinthesouthernpartoftheUnitedStates1.IntheNortheastandtheMiddleWestitisveryhotatsometimesandverycoldatothertimes.PeopleinthesestateshavemorehearttroubleaftertheweatherchangesinFebruaryorMarch. Theweathercanalsoinfluenceintelligence.Forexampleina1983reportbyscientistsIQ智商ofagroupstudentswereveryhighwhenaverystrongwindcamebutafterthestrongwindtheirIQwas10%lower2.Veryhotweatherontheotherhand另一方面canmakeitlower.StudentsinmanyschoolsoftheUnitedStatesoftengetworseonexamsinthehotmonthsoftheyearJulyandAugust. Weatheralsohasastronginfluenceonpeople'sfeelings.Wintermaybeabadtimeforthinpeople.Theyusuallyfeelcoldduringthesemonths.Theymightfeelunhappyduringcoldweather3.Theyevendon'tliketooutdooractivities. Lowairpressure气压maymakepeopleforgetful4.Thereisagoodweatherforworkandhealth.Peoplefeelbestatatemperatureofabout18centigrade摄氏度. Areyoufeelingsadtiredforgetfulorunhappytoday?5. A.Itmaybetheweather'sproblem. B.Warmweathercanhaveabadeffectonhealth. C.Thewindcanhelppeoplehavehigherintelligence. D.Butfatpeoplemayhaveahardtimeinhotweather. E.Peoplemayhavehigherintelligencewhenlowairpressurecomes. F.Peopleleavemorebagsonbusesandinshopsonlow﹣pressuredays. G.Peopletherehavehearttroubleandotherkindsofhealthproblemsduringthismonth.
ScottandDanielHarryareenjoyingeverydaytaskslikeshoppingandwashingforthefirsttimefollowingtheirmovetoanaccommodation住宿supporthouseinKurwongbahnorthofBrisbanelastyear. DisabilityServicesQueensland'sStrengtheningNon﹣GovernmentOrganisationsprojectprovidedanaccommodationsupportmodelthatwouldenableresidents居住者likeDanielandScotttolivemoreindependently. Thehouseisjustoneofmanyaccommodationsupportservicesfunded资助throughtheproject.Thefive﹣bedroomhouseprovides24﹣hourcareforuptofourindividualswithcomplexneedsincludingmedicalsupport.Careandstaffinglevelsarevariedandflexibledependingoneachresident'srequirements. ScottandDanielwhohaveasevereformofDuchenneMuscularDystrophyrequire24﹣hoursupportinallactivitiesofdailyliving.Beforetheymovedtothehousetheylivedwiththeirfamily.Scottsayslivingathomewasdifficultasitplacedaphysicalandemotionalstrain负担ontheirparentswhohadtowakethemseveraltimeseachnighttorepositionthemorplacethemonbreathingmachines. WewereheavyheartedsaysScottwhoisplanningtowriteabookabouthislifeexperiences.Butourparentsnowhavealotmoretimeforthemselves.Wenowmanageourselvesonaday﹣to﹣daybasis. Danielisanenthusiasticgardenertakingcareofhisownvegetablegarden.Themensharethehousewithoneotheryoungmanandtheygotorugbyleaguegamesmeetingupwithfriends. LeedingCareAustraliaprovidesthecareserviceatKurwongbah.ManagerLeeGarnisssayssettingupthefacilities设施hasnotbeenwithoutitschallenges. ItisanunconventionalmodelofcareLeesays.ThehomeisScottandDaniel'shomehoweveritisalsoaworkplacefortheirsupportstaff.Balancingthesetworequirementshasbeenachallengeforall. Wehaveexperiencedabitofalearningphaseoverthelasttwelvemonths.HoweverbyworkingasateamwetryourbesttomeettheneedsofbothresidentsandstaffandIthinkwehaveachievedtherightbalance. 1WhatdoweknowaboutthehouseScottandDanielliveinnow? A.Itwasbuiltbytheirparents. B.Itcanaccommodatefourresidents. C.Itbelongstoagovernmentalproject. D.It'slocatedinthecenterofBrisbane. 2WhydidScottandDaniel'sparentswakeupfrequentlyatnight? A.Tohelpthemdoexercise. B.Theyweremakingalotofnoise. C.Tocheckontheirbreathing. D.Theywereunderemotionalpressure. 3HowdidScottfeelwhilelivingwithhisparents? A.Abitguilty. B.Quitehappy. C.Veryproud. D.Slightlyangry. 4Whatwasachallengewhilesettingupthefacilities? A.Lackoffund. B.Noworkplace. C.Inexperiencedstaffmembers. D.Satisfyingbothstaffandresidents'needs.
如图已知⊙O是△ABC的外接圆且BC为⊙O的直径在劣弧上取一点D使=将△ADC沿AD对折得到△ADE连接CE. 1求证CE是⊙O的切线 2若CE=CD劣弧的弧长为π求⊙O的半径.
假如你是李华你的好朋友苏茹在交友方面存在一些困难请根据下面的提示给她写一封信. 内容要点如下 1.要交朋友首先要做一个朋友 2.要和朋友同甘共苦患难之中的朋友才是真正的朋友 3.友谊需要时间和投入effort. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. 3.信的开头与结尾已为你拟好不计入总词数. DearSuRu Iamsorrytoknowthatyouarehavingtroubleinmakingfriends. Yours LiHua
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某种机器使用若干年后即被淘汰该机器有一易损零件为调查该易损零件的使用情况随机抽取了100台已被淘汰的这种机器经统计每台机器在使用期内更换的该易损零件数均只有891011这四种情况并整理了这100台机器在使用期内更换的该易损零件数绘制成如图所示不完整的条形统计图. 1请补全该条形统计图 2某公司计划购买一台这种机器以及若干个该易损零件用上述100台机器更换的该易损零件数的频率代替一台机器更换的该易损零件数发生的概率. ①求这台机器在使用期内共更换了9个该易损零件的概率 ②若在购买机器的同时购买该易损零件则每个200元若在使用过程中因备用该易损零件不足再购买则每个500元.请你帮该公司用花在该易损零件上的费用的加权平均数进行决策购买机器的同时应购买几个该易损零件可使公司的花费最少
﹣2的绝对值为
Chinahasannouncedit'sabolishingitsone﹣childpolicy.Whatdifferencehasitmadestatisticallyspeaking? 400millionbirthsprevented Theone﹣childpolicyofficiallyinplacesince1979hasprevented400millionbirths.Parentshavefacedfinesandotherpunishmentsforhavingmorechildren. ThemajorityofthedecreaseinChina'sfertilityratehappenedinthe1970s.Itdroppedfrom5.8childrenperwomanin1970to2.7in1978.Despitetheone﹣childpolicytheratehadonlyfallento1.7by2013. 2128﹣babydeathsrate Sincetheone﹣childpolicywasintroducedbabygirlshavebecomemorelikelytodiethanboys. Inthe1970saccordingtotheUnitedNations60malesper1000livebirthsdiedundertheageofone.Forgirlsthefigurewas53.Inthe1980saftertheone﹣childpolicybecameofficialtherateforbothwas36.Bythe1990s26malesper1000livebirthsdiedbeforetheageofone﹣and33girls.The2000ssaw21boysper1000livebirthsdyingand28girls. 1.16boysbornforeverygirl SexuallyselectiveabortionshavebeenconsideredasamajorcauseofChina'sunusualimbalance. Gietel﹣BastenassociateprofessorinsocialpolicyatOxfordUniversitysaysthebirthsofmanygirlsarenotregisteredifparentshavebrokentherulebyhavingtwochildrenaddingofficialsoftenturnablindeye.It'sestimatedtherearenow33millionmorementhanwomeninChina. 421families WiththeageingofChina'spopulationandthecontinuationoftheone﹣childpolicya421homeisthedescriptiongiventohouseholdsinwhichtherearefourgrandparentcaredforbytwoworkingageparentswhothemselveshaveonechild. By2050it'spredictedthataquarterofChina'spopulationwillbe65orolder.Thepredicteddeclineinthenumberofpeopleofworkingageisthoughttohavepersuadedthegovernmenttodroptheone﹣childpolicy. 1Whenwasthebabydeathsrateforbothboysandgirlsequal? A.Inthe1970s. B.Inthe1980s. C.Inthe1990s. D.Inthe2000s 2Whatmakestheone﹣childpolicyabolishedaccordingtothepassage? A.Thedeclineofbirthrate. B.Theriseofbabydeathsrate. C.Thechangeoffamilystructure. D.Thedeclineofworkingagepeople. 3Thepassagesumsuptheonechildpolicyby. A.number B.example C.contrast D.analysis
Mostanimalsonlandareknowntousbutmanylivingthingsunderwaterarenot.Nowlet'sgettoknowsomeofthem. Seacucumber Seacucumberarestrangeanimalslivingatthebottomofthesea.Theywearbrownorpalegreencoatswithmanysticksup.Whensummercomestheystaydeeptosleepbecausetheyareafraidofheat.Andwhenitisautumntheymovetoshallow浅的waterandgettheirfood. Pike Thepikeisakindoffreshwaterfish.Theyaregoodswimmersandlikeswimmingnearboatswaitingtobefed.Theyhavesharpteethtocatchfishes.Whentheyareyoungtheyliveingroups.Howeverwhentheygrowuptheyprefertolivealone. Cuttlefish Acuttlefishcanswimquitefastsoitisalsocalledrocket火箭fish.Ithaseightarmsandtwofeelersonitsheadjustarounditsmouth.Itejectsink喷墨whenitisindanger.Itsmeatisdeliciousanditisoftenthefirstchoiceformanypeople. Octopus Anoctopushaslongarmswithwhichtocatchfoodandprotectitself.Whenitissleepingoneortwoofitsarmsarestillondutykeepingmoving.Onceitfeelssomethingdangerousitcanwakeupatoncetotakeaction. 1Seacucumbersstaydeeptosleepinsummerbecausethey. A.areafraidofhightemperature B.wanttogetstrongandfat C.areafraidoftheirenemy D.wanttolivealone 2Accordingtothepassagelikestoswimnearboats. A.theseacucumber B.thepike C.thecuttlefish D.theoctopus 3Whathappensifacuttlefishmeetsitsenemy? A.Itrushesattheenemyatonce. B.Itcutsoffoneofitsarms. C.Itbiteswithitssharpteeth. D.Itejectsinktotheenemy. 4Theofanoctopuscanhelpprotectitwhenindanger. A.color B.arms C.sound D.smells
YouprobablyknowwhoMarieCuriewasbutyoumaynothaveheardofRachelCarson.Oftheoutstandingladieslistedbelowwhodoyouthinkwasthemostimportantwomanofthepast100years? JaneAddams1860﹣1935 AnyonewhohaseverbeenhelpedbyasocialworkerhasJaneAddamstothank.Addamshelpedthepoorandworkedforpeace.Sheencouragedasenseofcommunity社区bycreatingsheltersandpromotingeducationandservicesforpeopleinneedIn1931AddamsbecamethefirstAmericanwomantowintheNobelPeacePrize. RachelCarson1907﹣1964 Ifitweren'tforRachelCarsontheenvironmentalmovementmightnotexisttoday.Herpopular1962bookSilentSpringraisedawarenessofthedangersofpollutionandtheharmfuleffectsofchemicalsonhumansandontheworld'slakesandoceans. SandraDayO'Connor1930﹣present WhenSandraDayO'ConnorfinishedthirdinherclassatStanfordLawSchoolin1952shecouldnotfindworkatalawfirmbecauseshewasawoman.ShebecameanArizonastatesenator参议员andin1981thefirstwomantojointheU.S.SupremeCourt.O'Connorgavethedecidingvoteinmanyimportantcasesduringher24yearsonthetopcourt. RosaParks1913﹣2005 OnDecember11955inMontgomeryAlabamaRasaParkswouldnotgiveupherseatonabustoapassenger.HersimpleactlandedParksinprison.ButitalsosetofftheMontgomerybusboycott.Itlastedformorethanayearandkickedoffthecivil﹣rightsmovement.TheonlytiredIwaswastiredofgivinginsaidParks. 1WhatisJaneAddamswell﹣﹣knownforinhistory? A.Hereffortstowinaprize. B.Herlackofpropertraininginlaw. C.Hersocialwork. D.Hercommunitybackground. 2WhatisthereasonforO'Connor'sbeingrefusedbythelawfirm? A.Herlackofpropertraininginlaw. B.Herlittleworkexperienceincourt. C.Thediscriminationagainstwomen. D.Thepoorfinancialconditions. 3Whomadeagreatcontributiontothecivil﹣rightsmovementintheUS? A.JaneAddams. B.RosaParks C.SandraDay D.RachelCarson. 4Whatcanweinferaboutthewomenmentionedinthetext? A.Theyarehighlyeducated. B.Theyaretrulycreative. C.Theyarepeace﹣lovers. D.Theyarepioneers.
已知∠AOB=60°OC是∠AOB的平分线点D为OC上一点过D作直线DE⊥OA垂足为点E且直线DE交OB于点F如图所示.若DE=2则DF=.
Whenpeopleusewordsand短语differentfromthestandardlanguageitiscalledadialect.
BecausemostJapanesepeopledon'treallyliketheideaofhavingaroommatealotoftheseyoungpeopleenduplivingaloneincludingyoungwomen.WhileTokyoismuchsaferthanlargecitiesinmanyothercountriescrimesdohappenandcriminalsoftenconsideryoungwomenwholivealonetobeeasytargets. Tohelpaddressthisproblemandalsotoputthemindsoffemaletenants房客ateaseapartmentmanagementcompanyLeoPalace21hasdevelopedwhatitcallstheManontheCurtainsystem. Usingaprojector投影仪controlledbyasmartphoneManontheCurtainthrowsanoutlineofamanontoyourcurtainssothatwhenpeopleoutsidelookatyourwindowstherewillappeartobeaguyinsidethusmaskingthatyoulivealone.Ifyou'rewonderinghowthat'sbetterthanjustputtingacardboardcutout剪贴画byyourwindowManontheCurtainisfull﹣motionprojectingvideosofactualactorsforanextremelylifelikelook. Currentlythesystemhas12differentoptionsincludingsuchfrighteningroutinesasabodybuilderworkingoutwithdumbbellsandasportsfanswingingabaseballbataroundwhichseemslikeitcoulddoubleasafitnessvideothatyoucoulddoyourselftogetherwithyourshadowyprotector. Sinceit'dbeeasytoinferthatashortsetpatternisafakeeachvideoisroughly30minuteslongwithavarietyofmotions. Grantedsomeoftheoptionssuchasthemanvacuumingorplayingguitararen'tgoingtobeaseffectiveifawould﹣becriminaliscloseenoughtothewindowtonoticethelackofsound.Buttheimagesthemselvesareveryconvincing. 1Whichofthefollowingstatementsisright? A.Tokyoisacityofnocrime. B.LadiesareeasilyrobbedinJapan. C.Onlyyoungladiesenjoybeingalone. D.LeoPalace21worksonapartmentaffairs. 2WhatistrueabouttheManontheCurtainSystem? A.It'sapopularmobileAPP. B.Itcanfindcriminalbehaviors. C.Itplaysavividcartoonfortenants. D.It'smainlydesignedforfemalelivingalone. 3WhatdoweknowaboutParagraph3? A.Cutoutsarebetterthanthesystem. B.Cutoutsaren'teffectiveatall. C.Peoplemaythinkyouarenotalone. D.Youcanwatchvideoswhenalone. 4Whatcanweinferaboutthesystemfromthelastparagraph? A.Itmaybeimprovedbythecompany. B.Itsvideowilllastlonger. C.Itsmotionsaren'tvividenough. D.Itwon'tbewellreceived.
如图直线y=4﹣x与双曲线y=交于AB两点过B作直线BC⊥y轴垂足为C则以OA为直径的圆与直线BC的交点坐标是.
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