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（1）已知，且α为第三象限角，求sinα的值 （2）已知tanα＝3，计算的值．
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高一下学期数学《》真题及答案
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TheInternationalVoluntaryServicerunsnumberofYouthExchangesthroughouttheyear.YouthExchangesgivesmallgroupsof4﹣5youngpeopletheopportunitytotakepartinvolunteeringtripsabroadforanaverageoftwoweeks.Theseyoungpeopletheopportunitytotakepartinvolunteeringtripsabroadforanaverageoftwoweeks.Theseyoungpeoplearejoinedby4﹣5youngpeoplefrom3﹣4othernationalitiesandareawonderfulinterculturalexperienceinasafeenvironment. ExampleYouthExchanges YouthExchange1 LocationIreland OthernationalitiesIrelandSpainItalyHungary ThemeFocusesonthetopicofcommunityreconstructionandcommunityactivities﹣﹣﹣exploringhowlocalissuesfacingoutcommunitiesareconnectedtoglobalissues.Thegroupwillalsolearnabouttheeco﹣villageasanexampleofacommunityandtakepartinteam﹣buildingactivities. YouthExchange2 LocationFrance OthernationalitiesBulgariaItalyFrance ThemeOrganicgardening&continualliving.ThisprojectwilltakeplaceinanaturalparkWherethegroupwilltakepartingardeningactivitiesandgames/workshopsaboutcontinuousdevelopment. YouthExchanges3 LocationMacedonia OthernationalitiesSerbiaTurkeyIreland ThemeFoster培育socialinclusionandmotivatepersonaldevelopmentofyoungpeoplethroughsportandoutdooractivities.Promoteoutdooractivitiesasatooltohelpinclusionofyoungpeoplewithfeweropportunities. YouthExchange4 LocationItaly OthernationalitiesItalyBulgariaGreece ThemeAsocial﹣environmentalprojectthatintendstopromotesocialinclusionandcontinuousdevelopmentregardedasaprocessofcivilrightsandactivecitizenship.Over10daysthegroupwillparticipateinactivitiestoraiseawarenessabouttheeffectofourbehaviorontheenvironment. 1WhatdoyoufocusonwhentravellinginFrance? A.Gardeningwork B.Civilrights. C.Developingsocialinclusion. D.Rebuildingcommunities. 2Ifyouareinterestedinprotectingtheenvironmentyoucantakepartin. A.YouthExchange1 B.YouthExchange2 C.YouthExchange3 D.YouthExchange4 3WhichnationalityareYouthExchangesmostpopularwith? A.Spain. B.Italy. C.Ireland. D.France.
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Whatabusyday!Thethreeboyswerefedbathedandchangedintotheirnightclothes.Maryhad1themastoryandfinallytheywereasleep.Babysitting照看thethreeboysagedeightsixandfourisextremely2shethought. SleepsheconsideredifonlyIcould！Butshehaddifficulthomeworktocomplete.Leaningbackshe3herfeetontothesofatogetcomfortable.Whoeversaidbabysittingwasan4waytomakemoneyobviouslyhadn'tmetthethreeboysshethought.Thetelevisionwasontheroomwaswarmandthelightsweredim.Mary's5feltheavierandheavier.Imustn'tsleepshethought﹣whichwas6whatshedidofcourse. Strangelyenoughshesoon7thatshewasaworldfamouschef主厨.Shemadea8andworediamondsanddesignerclothes.Mostdayssherelaxedbythepoolmeetingtherichandfamousor9﹣herfavoritehobby.She10tooktheleadingroleinherownTVshow. Thatisuntilshebecametoo11.Iamdefinitelythebestintheworldshethoughtasshepreparedatastychickendish.But12seemedtogoright.Shespilttheflourshedroppedaneggandshecutherfinger.Despiteallthetroublesshe13togetthechickenintothestove.Soonsmokeblanketedtheroom.Thechickenwasonfire.14setinbutMarycouldnotrun﹣shewas15tothespot.Shetriedhardtomovebutcouldnot16asharpsoundawokeher. Shegotshockedandconfused﹣17waspouringfromthekitchen.Rushingtoinvestigateshewasmetbythree18littlefacesandsomeveryburntbread.Sorrywewerehungryandyouwere19sowetriedtomakesomebreadexplainedaboy.RelievedMarymadethemasnackandsentthembacktobed.She20themnevertofallasleeponthejobagain! 1A.given B.written C.told D.taught 2A.successful B.helpful C.tiring D.surprising 3A.shook B.put C.bent D.kept 4A.difficult B.boring C.important D.easy 5A.eyes B.mind C.heart D.legs 6A.nicely B.exactly C.curiously D.carelessly 7A.realized B.reminded C.learnt D.dreamt 8A.decision B.fortune C.business D.plan 9A.cooking B.reading C.running D.babysitting 10A.just B.ever C.even D.only 11A.selfish B.proud C.stubborn D.sensitive 12A.everything B.something C.anything D.nothing 13A.tried B.arranged C.managed D.prepared 14A.Panic B.Pain C.Noise D.Stress 15A.frozen B.dragged C.pushed D.brought 16A.because B.until C.as D.unless 17A.smoke B.light C.water D.fire 18A.cheerful B.strange C.guilty D.confident 19A.busy B.hungry C.worried D.asleep 20A.promised B.allowed C.expected D.persuaded
InChinathehistoryofpeopleplantingandusingbamboocandatebacktoasfaras7000years.AsearlyastheShangDynastybamboowasbeingusedinancientpeople'sdailylives.Itwasusedforfoodclothinghousingtransportation1musicinstrumentsandevenweapons. The2applyofbambooinscienceandtechnologyisthrilling.In251BCLiBinginSichuan3leadthelocalpeopleinbuildingtheDujiangWeirs都江堰thefirstirrigationnetworkintheworldinwhichbambooplayed4importantrole.Theworld'soldestwaterpipewasalso5makeofbamboo.DuringtheHanDynastythepeopleinSichuan6successsanka1600﹣metre﹣deepwellwiththickbambooropes.ThistechnologydidnotspreadtoEurope7the19thcenturyanditwasbyusingthetechnology8theAmericansdrilledthefirstoilwellinPennsylvaniain1859. InChineseculturebambooiswell﹣knownas9ofthefourgentlemeninplants.Tomanyfamousmenbambooisasymbolofgoodnessandhonesty.Itisalwayscloselyrelatedtopeopleofpositivespirits.Bambooculturecontributestoencouragingpeopletoholdonwhen10facetoughsituations.
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TheiPhonetheiPadeachofApple'sproductssoundscoolandhasbecomeafad一时的风尚.Applehascleverlytakenadvantageofthepoweroftheletteri﹣andmanyotherbrandsarefollowingsuit.TheBBC'siPlayer﹣whichallowsWebuserstowatchTVprogramsontheInternet﹣adoptedthetitlein2008.Alovelybear﹣popularintheUSandUK﹣thatplaysmusicandvideoiscallediTeddy.Aslimmed﹣downversionofLondon'sIndependentnewspaperwaslaunchedlastweekunderthenamei. Ingeneralsingle﹣letterprefixes前缀havebeenpopularsincethe1990swhentermssuchase﹣mailande﹣commercefirstcameintouse. MostiproductsaretargetedatyoungpeopleandconsideringthemajorreadersofIndependent'siit'snosurprisethatthey'veselectedthisfashionablename. Butit'shardtoseewhat'ssospecialabouttheletterIWhynotuseaborcinstead?AccordingtoTonyThorneheadoftheLanguageCenteratKing'sCollegeLondoniworksbecauseitsmeaninghasbecomeuncertain.WhenAppleusesinooneknowswhetheritmeansInternetinformationindividualorinteractive.ThornetoldBBCMagazines.EvenwhenApplecreatedtheiPoditseemsitdidn'thaveonecleardefinitionhesays. HoweverthankstoApplethetermisnowassociatedwithportability轻便addsThorne. ClearlytheletterIalsoagreeswiththeideathattheWesternWorldiscenteredontheindividual.Eachpersonbelievestheyhavetheirownneedsandwelovepersonalizedproductsforthisreason. AlongwithGoogleandblogreadersofBBCMagazinesvotediasoneofthetop20wordsthathavecometodefinethelastdecade. Butashistoryshowspeoplegrowtiredoffads.Fromthe1900sto1990sproductswith2000intheirnamesbecamefashionableastheyearwasassociatedwithallthingsadvancedandmodern.Howeverasweenteredthenewcenturythetrendinevitably一定的disappeared. 1PeopleuseiPlayertoC. A.listentomusic B.makeacall C.watchTVprogramsonline D.readnewspapers 2WecaninferthattheIndependent'siisaimedatA. A.youngreaders B.oldreaders C.fashionablewomen D.engineers 3NowadaystheitermoftenremindspeopleoftheproductswhichareA. A.portable B.environmentallyfriendly C.advanced D.recyclable 4ThewritersuggeststhatB. A.iproductsareoftenofahighquality B.thepopularityofiproductsmaynotlastlong C.theletterbreplacesletteritonametheproducts D.iTeddyisalivebear.
如图所示一动点从半径为2的⊙O上的A0点出发沿着射线A0O方向运动到⊙O上的点A1处再向左沿着与射线A1O夹角为60°的方向运动到⊙O上的点A2处接着又从A2点出发沿着射线A2O方向运动到⊙O上的点A3处再向左沿着与射线A3O夹角为60°的方向运动到⊙O上的点A4处A4A0间的距离是…按此规律运动到点A2019处则点A2019与点A0间的距离是．
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HowSuperAreSupermarkets? Buyingeweek'sgroceriesistiring.Youwanttogetitoveranddonewithquicklysoyouheadforthenearestsupermarketyoufindeverythingyouneedunderoneroofandyoufeelgladthatthosedaysofgoinginandoutofdifferentshopsinthehighstreetareover.Supermarketsseemtobeabigplus.Thereisadownsidethough. IntheUK90%ofallthefoodpeopleconsumeisboughtat5differentsupermarketchains.Thismakesthesecompaniesextremelypowerfulwhichletsthemusetheirhugebuyingpowertosqueezesmallsupplierstogetthebestdeal.Milkisagoodexample.Supermarketsliketousethingslikemilkwhichisthetopofalmosteveryone'sshoppinglisttoattractcustomers.Toofferthelowestpricepossibletotheconsumerthesupermarketsforcedairyfarmerstosellmilkatlessthanthecostofproduction.Supermarketsguaranteetheirgoodprofitswhilefarmersareleftstrugglingtomakeendsmeetandthetaxpayerpaystosupportthesystemwithoutevenknowingit. Itwouldbeniceiflocalgrocerssupportedlocalagriculture.Butforthebigsupermarketsthisjustdoesn'tmakesense.Supermarketsdon'twantlittlefarmersthinkingtheycandecideprices.Sosupermarketshavestartedaglobalsearchforthecheapestpossibleagriculturalproduce.Inmanysupermarketsitisdifficulttofindanythingwhichisproducedlocally. UKfarmersusedtogrowalotofapples.Notanymore.In199936%ofappleswereimported.By2015thefigurehadrisento80%andthedomesticproductionofappleshadfallenbytwothirds.TheconsumermightjustbehappytogetareasonablypricedmealmadeupoffoodsfromThailandSpainItalyandZambiabutweshouldalsobearinmindtheInfluenceonlocalproducers. Thenthere'spackaging.Supermarketslikeeverythingtobepackedandwrappedsoitcanbepiledneatlyonshelves.Supermarketsproducenearly10milliontonsofwastepackagingintheUKeveryyearofwhichless5%isrecycled.Somesupermarketsmakesurethatlargerecyclingbinsareobviousintheircarparksshowingthattheyareenvironment﹣friendly.Butthatisjustanimage. Whenanewsupermarketisplannedthereareclaimsaboutthenumberofnewjobsthatwillbecreated.Unfortunatelythenumberofjobslostintheareaislargerthanthenumberofnewpositionsinthesupermarket.Onaverageeachnewsupermarketleadstothelossof276jobs. Howeverthemodernworldisallaboutshoppingandthefreedomtobuywhateveryouwhatsoitwouldbeimpossibletostoppeopleshoppingatsomeparticularkindofshop.Butsomemeasuresdoneedtobetakenwhensmallsuppliersloseprofitslocalproducerssuffersealevelsriseandjobsarelostanywaywecan'tjustcareaboutafreecarparkandspecialoffers. 1Theauthormentionsmilkinparagraph2toexplainhowsupermarkets. A.cheatthetaxpayers B.supportlocaldairyfarmer C.harmsmallsuppliers‘benefits D.providecustomerswiththecheapestproduct 2Accordingtothepassagesupermarketskeeppriceadvantageby. A.competingagainsteachother B.importingforeignproducts C.purchasinglocalproducts D.reducingproducttax 3Whichofthefollowingshowsthestructureofthepassage? CPCentralPointPPointSPSub﹣pointCConclusion 4Whatistheauthor'sattitudetowardssupermarkets? A.Critical B.Sympathetic C.Doubtful D.Cautious
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. LastSundayitwasmyfather'sfunnyday.Aftersuppermyfatherwenttoseethefilm.Butinoursurprisehecamebackjustabouthalfanhourlater.Iaskedhimwhatwasthematter.Hesmiledandtoldusaboutthefunnythingwhathadhappenedinthecinema.Hewassittinginhisseatwhileawomancametoherandsaidtheseatwashers.Surprisingtheylookedattheirticketcarefullyonlytofindtheseatsshownintheirticketswerethesamewhilethecolorsweredifferent.Sotheylookedattheticketsmorecarefully.AfterawhilemyfatherapologizedthewomansayingSorryImakeamistake.Takethisseatplease.Thefactwasthathisticketfoundoutinhisdeskdrawerwasforthefilmamonthago.
近似数5.10精确到
GetaThoroughUnderstandingofOneself Inallone'slifetimeitisoneselfthatonespendsthemosttimebeingwithordealingwith.1 Whenyouaregoingupwardsinlifeyoutendtooverestimate高估yourself.Itseemsthateverythingyouseekforiswithinyourreach.2It'slikelythatyouthinkitwiseforyourselftostayawayfromtheouterworld.Actuallytogetathoroughunderstandingofoneselfyoumayaswellkeepthefollowingtipsinmind. Gainacorrectviewofoneself.Youmaylookforwardhopefullytothefuturebutbesurenottoexpecttoomuchfordreamscanneverbefullyrealized.Youmaybecourageoustomeetchallengesbutitshouldbecleartoyouwheretodirectyourefforts.3 Self﹣appreciate.Whetheryoucompareyourselftoahighmountainorasmallstoneyourepresentastateofnature.4Ifyouearnestly诚挚地admireyourselfyou'llhavearealsenseofself﹣appreciation. 5Intimeofangerdoyourselfafavorbyreleasing释放itinaquietplacesothatyouwon'tbehurtbyitsflamesintimeofsadnessdoyourselfafavorbysharingitwithyourfriendssoastochangeabadmoodintoacheerfuloneintimeoftirednessdoyourselfafavorbygettingagoodsleep. Getafullcontrolofone'slife.Thenonewillfindone'slifefullofcolorandflavor. A.Ithasitsownvalue. B.Dooneselfafavorwhenit'sneeded. C.Doyourselfafavorwhenyouresisttheattackofillness. D.Butitispreciselyoneselfthatonehastheleastunderstandingof. E.Especiallyifitiswellwithinyourreachyouarejusttooblindtoseeit. F.Whenyouaregoingdownhillyoutendtounderestimateyourself. G.Solongasyouhaveaperfectknowledgeofyourselftherewon'tbedifficultiesyoucan'tovercome.
比较大小32．
如图1在平面直角坐标系xOy中已知点A和点B的坐标分别为A﹣20B0﹣6将Rt△AOB绕点O按顺时针方向分别旋转90°180°得到Rt△A1OCRt△EOF．抛物线C1经过点CAB抛物线C2经过点CEF． 1点C的坐标为点E的坐标为抛物线C1的解析式为．抛物线C2的解析式为 2如果点Pxy是直线BC上方抛物线C1上的一个动点． ①若∠PCA＝∠ABO时求P点的坐标 ②如图2过点P作x轴的垂线交直线BC于点M交抛物线C2于点N记h＝PM+NM+BM求h与x的函数关系式当﹣5≤x≤﹣2时求h的取值范围．
如图在平面直角坐标系中函数y＝kx与的图象交于AB两点过A作y轴的垂线交函数的图象于点C连接BC则△ABC的面积为
下面是一道确定点P位置的尺规作图题的作图过程． 如图1直线L1与L2相交于点OAB是L2上两点点P是直线L1上的点且∠APB＝30°请在图中作出符合条件的点P． 作法如图2 1以AB为边在L2上方作等边△ABC 2以C为圆心AB长为半径作⊙C交直线L1于P1P2两点．则P1P2就是所作出的符合条件的点P． 请回答该作图的依据是．
下列等式成立的是
随着高铁的建设春运期间动车组发送旅客量越来越大相关部门为了进一步了解春运期间动车组发送旅客量的变化情况针对2014年至2018年春运期间的铁路发送旅客量情况进行了调查过程如下． Ⅰ收集整理数据 请将表格补充完整 Ⅱ描述数据 为了更直观地显示动车组发送旅客量占比的变化趋势需要用填“折线图”或“扇形图”进行描述 Ⅲ分析数据做出推测 预估2019年春运期间动车组发送旅客量占比约为你的预估理由是．
假定你是中国高中生李华今年暑假期间将去澳大利亚悉尼南部Kogarah的一所综合性学校KogarahHighSchool学习一个月并将寄宿在当地的居民Silvia家中.请给Silvia写一封电子邮件询问一些将在Kogarah生活的有关情况.具体询问内容如下 1.住宿是否可以有单间2.房间里是否有网络 3.是否可以自己煮饭4.是否有便利的交通. 注意1.词数100左右 2.可适当增加细节以使行文连贯. 3.开头语和结束语已为你写好不计入总词数. DearSilvia GreetingsfromChina!IanLiHuaahighschoolstudentinChina.. Lookingforwardtoyourreply. Bestwishes. Yourssincerely LiHua.
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