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过y2=4x的焦点F并垂直于x轴的直线分别与y2=4x交于A，B，A在B上方，M为抛物线上一点，=λ+（λ﹣2），则λ= ．
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高三下学期数学《》真题及答案
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如图所示直线y=2x+2与x轴交于点A.与y轴交于点B.把△AOB沿y轴翻折点A.落到点C.过点B.
各力交于O点的汇交力系的平衡方程若写成一矩式∑Fx=0或∑Fy=0∑mAF=0则必须附加条件是
O、A两点连线垂直于x轴(或y轴)
A点与O点重合
O、A两点连线不垂直于x轴(或y轴)
A点可任选
设正值函数y=fxx≥0连续可微且f0=1已知曲线y=fx与x轴y轴以及过点x0且垂直于x轴的直线所
如图设抛物线的焦点为F抛物线上的点A到y轴的距离等于|AF|-1. I求p的值 II若直线AF交抛
如图M.为双曲线y＝上的一点过点Ｍ作ｘ轴ｙ轴的垂线分别交直线ｙ＝－ｘ＋m于D.C.两点若直线ｙ＝－ｘ
如图直线y=2x+n与双曲线y=m≠0交于A.B.两点且点A.的坐标为14.1求mn的值2过x轴上一
设函数fxx≥0连续可微f0=1．已知曲线y=fxx轴y轴及过点x0且垂直于x轴的直线所围成的图形的
已知椭圆+y2=1的两个焦点为F1F2过F1作垂直于x轴的直线与椭圆的一个交点为P.那么PF2=.
已知函数fx=e﹣2x﹣axa为常数的图象与y轴交于点A曲线y=fx在点A处的切线垂直于直线x+2y
已知直线l13x+4y﹣2=0和l22x﹣5y+14=0的相交于点P..求1过点P.且平行于直线2x
根据下列条件分别求直线方程过两直线3x－2y＋1＝0和x＋3y＋4＝0的交点且垂直于直线x＋3y＋4
设函数fxx≥0连续可导且f0=1．又已知曲线y=fxx轴y轴及过点x0且垂直于x轴的直线所围成的图
斜率不存在的直线一定是
过原点的直线
垂直于x轴的直线
垂直于y轴的直线
垂直于过原点的直线
已知定点P.x0y0不在直线lfxy＝0上则方程fxy－fx0y0＝0表示一条
过点P.且平行于l的直线
过点P.且垂直于l的直线
不过点P.但平行于l的直线
不过点P.但垂直于l的直线
设函数fxx≥0连续可微f0=1已知曲线y=fxx轴y轴及过点x0且垂直于x轴的直线所围成的图形的面
如图M.为双曲线上的一点过点Ｍ作ｘ轴ｙ轴的垂线分别交直线ｙ＝－2ｘ＋m于D.C.两点若直线ｙ＝－2ｘ
设函数fz当x≥0时连续可微且f0=1．现已知曲线y=fxx轴y轴及过点x0且垂直于x轴的直线所围成
设y=fxx≥0连续可微且f0=1．现已知曲线y=fxx轴y轴及过点x0且垂直于x轴的直线所围成的图
设椭圆的右焦点为F右顶点为A已知其中O为原点e为椭圆的离心率 Ⅰ求椭圆的方程 Ⅱ设过点A的直线l与
如图M.为双曲线y＝上的一点过点M.作x轴y轴的垂线分别交直线y=－x＋m于D.C.两点若直线y＝－
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ConfidenceComesFromTreatingOthersAsEquals There'sbeenrecentdiscussionoverChineseattitudestowardforeignerscausedbyanotherquarrelbetweenaforeignerandataxidriver.AccordingtothestudiesdescribedintheOxfordHandbookofChinesePsychologyChinesehavelowerself﹣confidencecomparedtoWesterners.YetdoestheresultstillapplytotheChinesepeopletoday? Yesandno.ForthemomentdifferentattitudestowardforeignerscanstillbefoundinChina'ssocietywithsomedisplayinglowself﹣confidencelikeForeignersareawesome令人敬畏的andWesterncountriesareawesome.Weshouldrespectthemandbeaspoliteaspossibleandshouldn'tletthemlookdownonusandafewunfriendlyopinionssuchasSomeforeignersarerudeanddisrespectfulandtheirlevelofcivility礼貌isfarbehindChina. Chineseusedtobelackinginself﹣confidence.ItmightstartfromthemodernhistoryafterthefailureintheOpiumwarsandthefollowinghumiliation耻辱ofbeingbullied被欺负andbroughttotheirkneesbyWesternguns.Andthedarkhistoryisstilltosomeextentaffectingourmentality心态today. ForsometimetheWesternworldrepresentsthebestofeverythinginsomeChineseeyes.Butourstateofmindisgraduallychanging.WhenaskedWhatmakesyoufeelproudofyourcountry?inschoolclassesinChinaanswersvaryfromtheWorldExpototheOlympicGamesfromathletestoastronautsfromthemushroomingskyscraperstobusymetropoliseswhichhaveallfilleduswithgrowingself﹣confidence. WhileansweringthequestionSinceChinaissogoodtodayandChinesepeoplearemoreconfidentwhyareanincreasingnumberofChineseemigratingabroad?ZhangWeiweiaprofessoratFudanUniversityrepliedthatatleast70percentofChinesemigrants移民becomemorepatriotic爱国的afterleavingtheirhomecountrynomatterwhethertheyhavebecomeanaturalizedcitizenofanothernationornot.Suchresultandexperiencesaremuchmoreconvincingandhavebettereffectthandozensofpatrioticeducationclasses. Thereisnoreasonforusnottobeself﹣confident.Weliveintheworld'ssecond﹣largesteconomy.Chinesenetfinancialassetspercapita人均纯金融资产andthepurchasingpowerofpeoplehaveseenasharprisewithmoreandmorepeoplestartingtopurchaseworksofartinsteadofonlynecessities.Theseallindicatearisingstandardoflifeandself﹣confidence. NeverthelessthepointofthechangingattitudestowardourselvesorothercountriesisnotrealizingothernationsarebetterorworsethanChinabuttreatingthemlikehowwetreatourfellowChinese.Thatiswhatconfidencemeansnotbeingcondescending屈尊notworshipingbutlookingeachotherintheeyewithtrustandrespect. 1AccordingtothetextwhataretheChineseattitudestowardforeignerstoday? A.Theyhavevariousattitudestowardforeigners. B.Theythinktheforeignersarealwaysrude. C.Theyalwaysspeakhighlyoftheforeigners. D.Theybelieveforeignersarejustcommonpeople. 2Chineseusedtolackself﹣confidencebecause. A.Theythoughttheforeignersweremysterious. B.Theyusedtothinkthemselveslesspowerful. C.Theyweredeeplyinfluencedbythedarkhistory. D.Theyoncebelievedforeignerswereawesome. 3AccordingtoZhangWeiweimostChinesemigrants. A.desiretobeacitizenofanothernation B.developastrongerlovefortheirhomecountry C.areunwillingtoreturntotheirmotherland D.serveasbadexamplesinpatrioticeducation 4What'sthemainideaofthepassage? A.Chineseshouldbeproudofthegreatachievementoftheircountry. B.Chinesehaveenoughconfidencetomakegreaterprogress. C.Chinesehavealowerself﹣confidencefacedwithforeigners. D.Chineseshouldbeconfidentandtaketheforeignersasequals.
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.答案应写在答题卡上2每处错误及其修改均仅限一词 3.只允许修改10处多者从第11处起不计分. We'relivinginaworldwherewecanneverstresstheimportantofsharingtoomuch.Bysharingwecanoftengreatreduceoursadnessanddoubleourhappiness. Whenitcametothistopicmemoriesfloodintomymind.TherewasatimewhenIcaughtinthesadnessofnotpassinganimportantexam.MyworldturnedgrayandIdidn'tfeelinterestedinsomethinguntilmybestfriendcameuptocomfortme.EncouragedandmovedbyhiskindnessIsharedmytroublewithhimthatrelievedmesoon.LittlebylittleIregainedmyconfidence.ThefollowedmonthswitnessedmyeffortsandIfinallymadeagreatprogressinotherimportantexams. Asyoucanseewhichwassharingwithmyfriendthathelpedmeoutofthatdarktimeandbringbackmyconfidence.Sharingisbeautifulnotonlyphysicallybutalsomentally.
对任意实数x都有a＞0且a≠1则实数a的取值范围是
如图在边长为1的正方形网格中粗实线表示一个三棱锥的三视图则该三棱锥的体积为．
已知在等比数列{an}中a1＝1且a2是a1和a3﹣1的等差中项． 1求数列{an}的通项公式 2若数列{bn}满足bn＝2n﹣1+ann∈N*求{bn}的前n项和Sn．
如图三棱柱ABC﹣A1B1C1的侧面BCC1B1是平行四边形BC1⊥C1C平面A1C1CA⊥平面BCC1B1且EF分别是BCA1B1的中点． Ⅰ求证EF∥平面A1C1CA Ⅱ当侧面A1C1CA是正方形且BC1＝C1C时 ⅰ求二面角F﹣BC1﹣E的大小 ⅱ在线段EF上是否存在点P使得AP⊥EF若存在指出点P的位置若不存在请说明理由．
已知数列{an}为等差数列Sn为其前n项的和．若a1+a3＝6a4＝7则S5＝．
WhilemanycountrieslovetheirteaUKcitizensareparticularlyproudofbeingteapeople.TheaverageUKcitizenconsumesnearly2kilogramsofteaeachyear. TeaonlymadeitswaytoEnglandinlargequantitiesinthefirstyearsofthe17thcentury.TeafromChinaandafewotherAsiancountrieswasbeingsoldmorewidelyinEnglandatthattime.Thenteawasgettingmoreandmorepopularamongdifferentsocialclasses. Therearemanyvarietiesoftea.BlackteamixturesarestillthemostcommontypedrunkintheUK.Blackteaisdarkincolourbecausetheleaveshavebeenallowedtooxidize氧化beforedrying.Thisiswhyweusuallyserveitwithmilkalthoughitisnotuncommontodrinkitblackorwithlemon.Youmaystillfindteamadewithloosetealeavesservedupinapotandpouredintothebestchinacupswithsaucers茶托forvisitors. TeaisstillalargepartofdailylifeintheUKtodaybutitseemstobeonthedecrease.TheamountofteasoldintheUKfellbymorethan10%inthefiveyearsleadingupto2002andhasbeendroppingeversince.Teasalesfellby6%in2014aloneandmostrestaurantsreportsellingmorethantwiceasmanycupsofcoffeeastheydotea.Morethan￡1billionwasspentoncoffeeinhighstreetstoresin2013morethantwicewhatwasspentonteabags. Stillwhatgoesaroundcomesaroundit'ssuretobecomefashionableagain. 1Whichofthefollowingistrueaccordingtothefirstthreeparagraphs? A.TeamadeitswaytoEnglandintheearlyyearsofthe16thcentury. B.TheUKusuallyservesblackteawithlemon. C.TeafromChinawasbeingsoldmorewidelyinEnglandnow. D.UKcitizenstakeprideinbeingteapeople. 2Whatcanweinferfromthefourthparagraph? A.Teasalesfellby6%in2014alone. B.Since2002thesalesofteahasbeenonthedecrease C.In2013themoneyspentonteawas￡3billion D.Mostrestaurantlikesellingteathancoffee. 3Whatdoestheunderlinedsentencemeaninthelastparagraph? A.Itcanneversucceedagain B.Theteacanbecomepopularagain C.Coffeeismorepopularthantea D.Theteaisbecominglesspopular 4Whatistheauthor'spurposeinwritingthetext? A.TointroduceteaintheUK B.Toshowtheauthor'spreferencefortea C.Tointroducethefunctionsoftea D.TocompareteainChinaandUK
RunningforaDream IwillneverforgetthatNovemberday.Itwashotterthannormal.Thiswasthe1myfatherandIhadwaitedsolongforbecausewehadbeenworkingtowardsthisraceforthreeyears.Dozensoffamiliarfacesfromchurchandschoolflashedacrossmyview.Theyhadcome2me.Isawworryand3onmyfather'sface.Thentheracebegan! ForthefirsttwoandahalfmilesIfelt4.Ihadneverbeforebeensoreadyforsomething.Theweeksleadinguptotheracewerefilledwithcontrolled5andastrictdiet.Myfriendshadn'tseenmeinweeksbuttheyunderstoodthe6requiredtomakemydreamareality.AsinallofmyracesIdidn't7outinthefrontIlovedthepleasureofpassingpeopleasmystrengthovertooktheirprematurespeed. Thenwithoutwarningmystrengthbegantodecrease.NeckandneckwithoneofmygreatestcompetitorsI8seethefinishline.Ihadbegunthefinaldashinto9whenmykneesbecameweakandmylegsgaveway.NothingIcoulddowouldmakethem10weight. Iwatchedasrunnersrushedbyme.11IknewmydreamsofvictoryweredestroyedIhadtofinishtherace.Howevermylegshurtbadly.Withallofthe12leftinmeIgotonmyhandsandkneesandcrawled爬inchbyinchacrossthefinishline.Voicesboth13andfamiliarcheeredmeon.Theygavemethecouragetokeep14untiltheveryend. Thedoctorswerethereinsecondsbutmyeyessearchedthecrowdforhim.TherewasonlyonepersonIwantedto15to.IwhisperedI'msosorryDadI'msosorryI16you.HelookedatmesayingYoucouldneverdisappointme.Sometimesthesethingsjust17.Allthatmattersisthatyoudidyourbest. Butweworkedso18.Whataboutourdream?HereachedoverformyhandandsaidDon'tyouknowthatyouaremydreamandithascometrue? Itwasn'tlongbeforemyrunningshoeswerebackonmarkinga19pathformyjourneyIlearnedthatallofthemilesthetearsthesweatandthepainmydadandIexperiencedtogetherwerenotfora20.WhatIrealizedthoughwasthattohimIwasthegreatestprizehehadeverwon. 1A.dream B.weather C.result D.day 2A.for B.to C.across D.over 3A.coldness B.astonishment C.excitement D.amusement 4A.proud B.great C.nervous D.afraid 5A.programs B.studies C.instructions D.practices 6A.understood B.blamed C.criticized D.concerned 7A.look B.move C.start D.come 8A.should B.could C.must D.need 9A.relief B.spirit C.pleasure D.glory 10A.give B.feel C.hold D.add 11A.Where B.Because C.If D.Although 12A.trust B.emotion C.strength D.confidence 13A.loud B.foreign C.rough D.firm 14A.going B.running C.fighting D.training 15A.refer B.talk C.listen D.agree 16A.frightened B.disturbed C.disappointed D.bored 17A.develop B.change C.follow D.happen 18A.late B.hard C.closely D.quickly 19A.new B.near C.rough D.narrow 20A.wish B.duty C.rank D.race
假定你是高三学生李华你的美国朋友Peter写信询问你的高考志愿.请你用英语回信介绍以下情况 内容要点 1.你准备报考哪所大学 2.该大学简介 3.你为什么选择该大学. 注意 1.词数100左右 2.开头语和结束语已为你写好不计入总词数.
设θ为第二象限角若tan＝则sinθ•cosθ＝．
已知sin+α＝则cosπ﹣2α的值等于
已知数列{an}满足an＝an+1+nn≥2当a1＝1时a4＝．
设集合A＝{x|x＞0}B＝{x|x2﹣5x﹣14＜0}则A∩B等于
若实数xy满足约束条件且目标函数z＝x+y的最大值等于
若0＜x1＜x2＜1则
过椭圆W＝1的左焦点F1作直线l1交椭圆于AB两点其中A01另一条过F1的直线l2交椭圆于CD两点不与AB重合且D点不与点0﹣1重合．过F1作x轴的垂线分别交直线ADBC于EG．Ⅰ求B点坐标和直线l1的方程Ⅱ求证|EF1|＝|F1G|．
2018年国际象棋奥林匹克团体赛中国男队女队同时夺冠．国际象棋中骑士的移动规则是沿着3×2格或2×3格的对角移动．在历史上欧拉泰勒哈密尔顿等数学家研究了“骑士巡游”问题在8×8＝64格的黑白相间的国际象棋棋盘上移动骑士是否可以让骑士从某方格内出发不重复地走遍棋盘上的每一格图一给出了骑士的一种走法它从图上标1的方格内出发依次经过标23456…到达标64的方格内不重复地走遍棋盘上的每一格又可从标64的方格内直接走回到标1的方格内．如果骑士的出发点在左下角标50的方格内按照上述走法填“能”或“不能”走回到标50的方格内．若骑士限制在图二中的3×4＝12格内按规则移动存在唯一一种给方格标数字的方式使得骑士从左上角标1的方格内出发依次不重复经过23456…到达右下角标12的方格内分析图二中A处所标的数应为．
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已知abc分别为△ABC三个内角ABC的对边． 1求角A 2若a＝2△ABC的面积为求bc．
AllAboardforaFamilyTripbyTrain Ifyou'relookingforafamilyvacationidealooknofurther.ExploreAmericawithAmtrak.Onthetrainyourfamilywillhaveplentyofroomtospreadoutandrelax. OnceonboardthefamilycantakeinthesceneryfromtheSightseerLounge观景车厢.PlusmostofourovernighttrainsfeatureDiningcarsthatservethreemealsadaywithfullmenusandtableservice.Ifyou'relookingforlighterfaregrababitetoeatoradrinkintheCafécar.YoucanalsoreserveSleepingcaraccommodationsandletthegentlerhythmsofthetrainswayyoutosleep.It'sthebestwaytoarriveatyourdestinationrestedandreadytogo. LearnMoreAbouttheOnboardExperienceonwww.amtrak.com •ADiningExperiencelikeNoOther Fromfullsit﹣downmealstomoreinformalfoodservicemanytrainshaveoneormoreoptionforonboarddining.Ifyou'renothungryyoumightstarttohearyourstomachrumbling腹鸣afterlookingatourmenus.Weprovideyouwithmorediningchoicesonboarddiningreservationsandthedifferenttypesofdiningcarslikelongdistancedinningcarloungecarandcafécar. •SleepingAccommodations Sleepingaccommodationsareavailableonmostlong﹣distanceroutes.Amtraktrainstravelingonlong﹣distanceroutestypicallyuseeithertwo﹣levelSuperlinerorone﹣levelViewlinertraincarequipmenteachofwhichincludebedroomsarrangedinvariousconfigurationsandprivateandpublicbathroomsandshowers. •SeatingAccommodations OnmostAmtraktrainsyouhavethreeoptionsforseatingaccommodations.Theavailabilityoftheseoptionsvariesdependingonyourrouteandthetypeoftrainequipmentinuse CoachClassDesignedforYoutoRelax. BusinessClassMoreAmenities.MoreComfort. FirstClassExclusivelyonAcelaExpress. 1Thefamilycansavealittlemoneybyeatingat. A.dinningcar B.viewliner C.cafécar D.superliner 2HowmanychoicesdoesAmtraktraincanofferinseatingaccommodations? A.Two. B.Three. C.Four. D.Five. 3Fromthepassagewecanknowthat. A.alltrainsprovidesleepingaccommodations B.noovernighttrainsfeatureDiningcarsatall C.tripbytrainistheonlywaytotravelrested D.manytrainshavemanyanoptionfordining
将函数y＝sin2x的图象向右平移φφ＞0个单位后图象经过点则φ的最小值为
ZooanimalsVSanimalsinthewild Zooanimalsusuallylivelongerthantheirwildcounterparts.Thisisbecausetheyhaveaccesstomedicalcareandbetternutritioninzoos.Moreoverthereisalackofpredators捕食者.1Elderlywildanimalslosetheirstrengthabilitytofindanddigestfoodandoftenlosetheirsocialstandingintheirspeciessocialstructure.Zoosarelearninghowtocareforoldanimals. Boredomisabigproblemforanimalsinzoosandsomethinganimalsinthewilddonothavetoface.Animalexpertsbelievethatasmallplaceproducesboredom.2Theyalsoprovidecompanionsandhidepiecesoffoodsotheanimalshavetosearchforitasinthewild. 3AcaseinpointistheAsiaticwildhorse.Thespecieswashuntedtoextinctioninthewildby1969.Theentireworldpopulationnowlivesinzoosandnaturepreserves.ThelargestpopulationiskeptattheNationalZooinWashington.D.C.Allofthoseanimalswerezoo﹣born. Animalslivinginthewildmaycomeintocontactwithpeople.Theanimalsmayhuntlivestock家畜oreatfarmers'crops.4Ingoodzoospeoplecanseethattheseanimalsarenotjustabletomaketroublebutleadcomplexlives.Thiscanhelppeoplesavetheanimalandthehabitatneededtokeeptheanimalaliveinthewild. Animalsoftenreproducebetterwhentheyareinthewild.5Oneoftheremarkableexamplesisthefemalegiantpanda.Usingartificial人工的meanshashelpedraisetheworldwidepandapopulation.Alsobytryingtorecreatetheanimal'snaturallivingconditionsasmuchaspossiblezooanimalswillbreed. A.Thegoalsofzooshavechanged. B.Howeversomeanimalsareanexception C.Iftheyliveinthewildtheyhavetobattleagainstthem. D.Asaresulttheyareconsideredharmfulandarehunted. E.Evensoitoftenleavesonetowonderiftheanimalslivewell. F.Forsomespecieslivinginzoosistheonlywaythespeciescansurvive. G.Sogoodzooshavereplacedallmetalcagesforthoseanimalsthatusedtoliveinlargeareas.
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. I'mdelightedtoknowyoushowedagreatinterestinChinesetablemanners.NowIwouldliketoshareyouhowtobehaveproperlywhenweareinvitedtodinner. Tobeginwiththehostwillreserveaspecialseatfortheguestwhichishighlyhonoredonsuchanoccasionbutisexpectedtobethefirsttotastethefoodserved.BesidechopsticksandspoonsareusuallyusedwhenyouareeatinginChina.Thirdyouarenotsupposedtomakinganoisewhileeatingsoup.Lastbutnotleastremembertothankthehostforthedeliciousfoodhehasbeenofferedwhichwillsurelymakehimhappily. Ihopemyadviceswillbeofhelptoyou.
BeingoverweightcancausedepressionevenwhennootherhealthproblemsexistaccordingtoastudyreleasedTuesdaybytheUniversityofExeter. Ateam1leadbyresearchersfromtheUniversityofExeteranalyzedUKBiobankdata基因数据库frommore248000peoplewithdepressionand3comparethemtoanothergroupofmorethan290000people. While4haslongbeenknownthatdepressionismorecommoninobesitytheteamconcluded5higherbodymassindex体重指数cancausedepressioninitselfevenintheobese6otherhealthproblems. Ourgeneticanalysisconcludesthatthepsychologicalimpactofbeingobeseislikely7causedepression.Thisisimportanttohelptargeteffortstoreducedepression8makesitmuchharderforpeopletoadopt9healthlifestylehabitssaidDrJessTyrrell.Theteamtestedtheirresultsinmanypeopleandtheyreached10sameconclusionverifyingtheirresults. ThestudyhasbeenpublishedintheInternationalJournalofEpidemiology.
DavidCameronisurgingtoday'syoungsterstoabandonFrenchtoconcentrateonthetongueofthefuture﹣Mandarin普通话. CameronsaidIwantBritainlinkeduptotheworld'sfast﹣growingeconomies.Andthatincludesouryoungpeoplelearningthelanguagestosealtomorrow'sbusinessdeals. BythetimethechildrenborntodayleaveschoolChinaistobetheworld'slargesteconomy.Soit'stimetolookbeyondthetraditionalfocusonFrenchandGermanandgetmanymorechildrenlearningMandarin.TostrengthenhismessagehequotedNelsonMandela﹣theformerpresidentofSouthAfricawhosaidIfyoutalktoamaninalanguageheunderstandsthatgoestohisheadifyoutalktohiminhisownlanguagethatgoestohisheart. CameronsaidthatapartnershipbetweentheBritishCouncil英国文化协会andHanbanwilldoublethenumberofChineselanguageassistantsintheUKby2016andprovideincreasedfundingtoschoolsofofferingMandarinasalanguagechoice.InadevelopmentoftheUK﹣ChinaSchoolPartnershipprogrammefundingwillalsobeprovidedfor60headteacherstomakestudyvisitstoChinain2014. InrecentresearchtheBritishCouncilfoundonly1%oftheadultpopulationspeaksMandarintoalevelthatallowsthemtoconductabasicconversation.Just3000pupilsinEnglandWalesandNorthernIrelandenteredforChineselanguagesGCSEsin2013puttingitfarbehindthetraditionalchoicesofFrenchwith177000Spanishwith91000andGermanwith62000entrants加入者aswellasUrduPolishandArabic. ProfessorDameHelenWallacetheBritishAcademy'sforeignsecretarysaidalackofqualifiedteacherscouldbeabarriertoimproveitspopularity. LauraChanoneoftheco﹣foundersofabilingualMandarin﹣Englishprimaryschoolsaidtheprimeminister'sannouncementwasgoodnewsforthestatusofMandarin.ShesaidIt'sagreathelp.Itwillincreasepeople'sawarenessofMandarinasalanguagetheycanlearn. 1Whatisthetextmainlytalkingabout? A.ThecooperationisimportantbetweentheUKandChina. B.DavidCameronhasvisitedChinaforthreedays. C.ChineselanguageisverypopularwithBritishpeople. D.DavidCameroncallsforBritishstudentstolearnMandarin. 2WhydoesDavidCameronurgestudentstolearnChinese? A.BecauseChinesewillbeawidely﹣usedlanguageintheworld. B.BecausehethinksChinawillbecomethelargesteconomy. C.BecausetherearemanyChinesepeoplelivinginBritain. D.BecauseonlyafewofBritishpeoplecancommunicateinChinese. 3WhatisthepurposeofDavidCameronbyquotingMandela'swordsinParagraph3? A.Tocomparedifferentideas. B.Toshowhisrichknowledge. C.TopersuadepeopletolearnMandarin. D.ToshareMandela'sopinion.
已知集合A＝{x∈N|1≤x≤3}B＝{2345}则A∪B＝
在△ABC中已知A＝BC＝13． Ⅰ求AB的长 Ⅱ求BC边上的中线AD的长．
已知{an}为等差数列a1+a3+a5＝18a2+a4+a6＝24则a20等于
执行如图所示的程序框图若输入的S＝12则输出的S＝
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