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已知x，y满足，则z=2x﹣3y的最小值为 ．
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高三下学期数学《》真题及答案
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﹣9
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已知实数xy满足则z＝2x＋y的最小值是________.
若xy满足若z＝2x﹣3y有最小值为﹣7则z的最大值是
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14
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已知xy满足约束条件1求目标函数z=2x+y的最大值和最小值;2求目标函数z=2x-y的最大值和最小
已知xy满足则z=2x﹣3y的最小值为．
已知实数xy满足条件若目标函数z=2x+y的最小值为3则其最大值为.
已知实数xy满足则目标函数z=4x﹣3y的最小值为．
已知实数xyz满足x＋2y＋z＝1求t＝x2＋4y2＋z2的最小值.
设xy满足约束条件则目标函数z=2x﹣3y的最小值是___________
已知z=x﹣2y其中xy满足不等式组则z的最小值为
已知实数xy满足则z＝3x－y的最小值为
－1
1
3
2
已知实数xy满足则z=2|x﹣2|+|y|的最小值是
6
5
4
3
设xy满足约束条件则z=2x﹣3y的最小值是
﹣7
﹣6
﹣5
﹣3
已知实数xy满足1若z＝x2＋y2求z的最大值和最小值2若z＝求z的最大值和最小值.
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若实数xyz满足x＋2y＋3z＝aa为常数求x2＋y2＋z2的最小值.
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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．
Chinaplanstolaunch156smallsatellitesby2025toprovideInternetservicesinlowsignalareasandplaceswithadversenaturalenvironmentaccordingtoChinaAerospaceScienceandIndustryCorporationCASIC. Duetoenvironmentalconditionsofdesertsmountainsandseashalfoftheworld'spopulationhasnoaccesstotheInternetandtheinformationdeficiencyhamperslocaldevelopment. ItwillbeChina'sfirstbroadbandInternetaccesssystemwithsmallsatelliteshoveringinloworbitwhichwillalsohelpmeettheneedsofcommercialspacedevelopment. TheprojectnamedHongyunplanstosendthefirstsatelliteby2019andlaunchfourmoreby2020.Bytheendof2025CASICplanstohaveallofthe156satellitesinoperation. TheHongyunProiectwhichfocusesoncommunicationremotesensingandnavigationcanoffercommunicationandInternetservicesforChinaandless﹣developed3countrieswithreducedlatency.Meanwhiletheprojectcanalsobenefitemergencycommunicationsensordatacollectionandremotecontrolofunmannedequipment. Currentlyinternationalmaritimesatellitesarewidelyusedincommunicationsinmountainousareasandairplanesbutthosesatellites36000kilometersabovetheEarthhavetimeandsignaldelayaswellashighcostforprovidingservices. ThesmallsatellitessentbytheHongyunProjectwillhoverinloworbitsonlyhundredsofkilometersto1000kilometersabovetheEarthandthuscouldimprovetheInternetaccess.Howevertheloworbitsatellitesmayfacechallengesinpowersupplyastheyneedmoreenergytoreducetheinfluenceofair﹣resistancecomparedtohighorbitsatellites.Experimentsareneededtodeterminewhethersolarenergyaloneisenough. 1Accordingtothepassage. A.156satelliteswillbelaunchedbytheHongyunProjectby2020 B.internationalmaritimesatellitescancausesignaldelay C.TheHongyunProjectmaynotencouragecommercialspacedevelopment D.loworbitsatellitesarecurrentlyusedwidelyincommunicationsinmountainousareas 2TheunderlinedwordhampersinParagraph2probablyrefersto. A.accelerates B.determines C.prevents D.promotes 3WhichofthefollowingisnotincludedintheHongyunProject? A.CommunicationandNavigation. B.Remotesensing. C.Datacollection. D.Solarenergy. 4Loworbitsatellitesneedmoreenergyinorderto. A.providemoreaccuratedata B.improvetheInternetaccess C.reducetheeffectofair﹣resistance D.facemorechallenges
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
WintersarealwayslongandcoldinNorthChina.Thewinterof2008wasespeciallytoughinonesouthwesterncity1itbecameextremelycoldanditwasalsoadifficulttimeforme.Whatwasworsean2injuryhappenedtomeanditmightkeepmeinbedforseveralmonthsJustintimefortheSpringFestivalmymothersaidtomesighing.ButhowcouldIfeelthe3whenthesnowwassoheavyandIhadmonthsofphysical4ahead? OnedayIwasdoingmyhousework5therewasatapagainstthewindowfromabranchofthetroublesomefruittree.OnhearingthiswithmyeyesclosedslowlyIbegantorecallthefallof1995whensomebodyplacedapipefrommypumpnexttothe6.Theearthwassowetthatit7immediatelywithmostitsbarerootsupward.Seeingthismymother8topullitoutbutIrefused.Howhardit'strying!Isaid9thedirectionofitsstrongholdingoftheearth.Itis10ofachancetosurvive.Withtoolswe11drysoilaroundthetreeandputupsomesupportsintothegroundmakingit12upright. SeveralmonthshadpassedbeforeIcouldbe13ofit.Surprisinglywhenspringreturnedmyrescue14hadgrownsomeleavesandmany15.In2009thatlittlerescuestickhadgrownintoatoweringtree.Whatanunbelievablemiracleoflife! ThedaybeforetheSpringFestivalthe16atthewindowwascontinuingthemorefiercewindthe17soundasiftoremindmetolookupandappreciateitspowerfullife. ThatnightIsleptpeacefullyhavingan18.Inthedreamsomeflowerswerecomingout19.ThenextmorningIstoodagainstthewindow.20thewindowwasthetreeburstingwithlife.AnywayIhadawonderfulSpringFestivalthatyear. 1A.where B.which C.when D.that 2A.admirable B.terrible C.favorable D.slight 3A.duty B.joy C.cold D.failure 4A.treatment B.report C.exercise D.experiment 5A.while B.as C.when D.that 6A.window B.tree C.branch D.wall 7A.stoodup B.cameout C.gotout D.felldown 8A.decided B.pretended C.failed D.continued 9A.attachingto B.watchingover C.lookinginto D.pointingto 10A.confident B.proud C.worthy D.certain 11A.threw B.turned C.needed D.placed 12A.bend B.drop C.stand D.swing 13A.aware B.tired C.worthwhile D.proud 14A.tool B.stick C.pipe D.pump 15A.roots B.nuts C.flowers D.stems 16A.tapping B.striking C.attacking D.hitting 17A.more B.most C.better D.best 18A.idea B.walk C.rest D.dream 19A.politely B.shyly C.passively D.wildly 20A.On B.Outside C.Inside D.Besides
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．
已知向量＝12＝x﹣2且⊥则|+|＝
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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