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在直角坐标系xOy中,曲线C的参数方程为(α为参数),直线l的方程为y=kx,以坐标原点为极点,x轴正半轴为极轴建立极坐标系. (Ⅰ)求曲线C的极坐标方程; (Ⅱ)曲线C与直线l交于A,B两点,...
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高三下学期数学《》真题及答案
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已知在直角坐标系xOy中直线l的参数方程为t为参数以坐标原点为极点x轴的正半轴为极轴建立极坐标系曲线
选修4﹣4坐标系与参数方程在直角坐标系xOy中直线l的参数方程为t为参数.在极坐标系与直角坐标系xO
在直角坐标系xOy中以原点O.为极点x轴的正半轴为极轴建立极坐标系.曲线C.1的参数方程为t为参数曲
在平面直角坐标系xOy中直线l的参数方程为t为参数曲线C.的参数方程为θ为参数.试求直线l和曲线C.
在平面直角坐标系xOy中直线m的参数方程为t为参数在以O.为极点射线Ox为极轴的极坐标系中曲线C.的
在直角坐标系xOy中直线l的方程为x-y+4=0曲线C.的参数方程为α为参数.1已知在极坐标系与直角
在直角坐标系xOy中直线l的参数方程为t为参数在以O.为极点x轴的非负半轴为极轴建立的极坐标系中曲线
在直角坐标系xOy中曲线C.1的参数方程为α为参数在极坐标系与直角坐标系xOy取相同的长度单位且以原
在平面直角坐标系xOy中以O.为原点以x轴正半轴建立极坐标系曲线C.的极坐标方程为ρ2﹣4ρsinθ
选修4—4坐标系与参数方程在平面直角坐标系xOy中已知曲线C.的参数方程为.以直角坐标系原点O.为极
在直角坐标系xOy中过点P.21的直线l的参数方程为t为参数以坐标原点为极点x轴正半轴为极轴建立极坐
在平面直角坐标系xoy中圆C.的参数方程为t为参数.在极坐标系与平面直角坐标系xoy取相同的长度单位
在平面直角坐标系xOy中直线l的参数方程为t为参数曲线C.的参数方程为θ为参数.试求直线l和曲线C.
在直角坐标系xOy中曲线M.的参数方程为α为参数若以直角坐标系中的原点O.为极点x轴的正半轴为极轴建
选修4—4坐标系与参数方程在平面直角坐标系xOy中已知曲线C.的参数方程为.以直角坐标系原点O.为极
在平面直角坐标系xOy中直线l的参数方程为t为参数曲线C.的参数方程为θ为参数.试求直线l和曲线C.
选修4﹣4坐标系与参数方程在直角坐标系xOy中直线l的参数方程为t为参数.在极坐标系与直角坐标系xO
在平面直角坐标系xOy中直线l的参数方程为t为参数曲线C.的参数方程为θ为参数试求直线l与曲线C.的
在平面直角坐标系xoy中已知曲线C.的参数方程为α为参数现以O.为极点x轴的正半轴为极轴建立极坐标系
在直角坐标系xOy中以原点O.为极点x轴的正半轴为极轴建立极坐标系.曲线C.1的参数方程为t为参数曲
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Whenyouhavegotalotofstuffdecluttering整理yourhomecanbereallynecessary.Declutteringisjustaboutputtingnewsystemsintoplaceinyourlife.1yourealizehowgreatyoufeelaboutitandyouwanttokeepgoing. Gettingridofthingsgivesyoutimetolookafteryourself.2orlookingforthepotatopeeler﹣becauseeverythinghasahomeandyouknowexactlywhereitis﹣you'refreetospendthattimeonyourselfandyourfamily.It'sliberating. 3.Ithastakenyoualongtimetogeteverythingandyouwon'tbeabletogetridofitallstraightaway.Ifyou'repushedfortimethereareeasywaysofintroducingdeclutteringintoyourlife.Spend10minutesadaydeclutteringorifthat'snotmanageabledeclutterthreeitemsaweek. Havethreepiles:oneforthingsyou'regoingtokeeponeforthingsthatareamaybeandoneforthingsyou'regoingtogiveaway.Youwillalsoneedsomebinbagsforrubbish.Arevisitingpileisimportantifyou'restrugglingtogetridofthings.4.MoreoftenthannotyouendupsayingactuallyIdon'tneedthat. Stayfocused.Peopleoftengetsidetrackedwhenthey'retryingtodeclutter.Theystarttryingonclothestheyhadforgottenaboutorlookingatoldphotos.Anothercommonmistakeistojustmovethingsfromplacetoplaceinsteadofgettingridofthem.5. A.Onceyoustartdecluttering B.Youneedtimetoreflectonwhattokeep C.Don'texpecttodecluttereverythingovernight D.Whenyou'renotalwayslookingforthescissors E.Ifyourealisethatyouownsixwineopenerskeeponlyone F.Startthedeclutteringprocessbeforeyoumoveinwithanewpartner G.Youcanjustleavethingsthereforafewweeksbeforeafinaldecision
Duringtherosyyearsofelementaryschool小学Ienjoyedsharingmydollsandjokeswhichallowedmetokeepmyhighsocialstatus.Iwasthequeenoftheplayground.Thencamemytweensandteensandmeangirlsandcoolkids.TheyroseintheranksnotbybeingfriendlybutbysmokingcigarettesbreakingrulesandplayingjokesonothersamongwhomIsoonfoundmyself.Popularityisawell﹣exploredsubjectinsocialpsychology.MitchPrinsteinaprofessorofclinicalpsychologysortsthepopularintotwocategories:thelikableandthestatusseekers.Thelikables'plays﹣well﹣with﹣othersqualitiesstrengthenschoolyardfriendshipsjump﹣startinterpersonalskillsandwhentappedearlyareemployedeverafterinlifeandwork.Thenthere'sthekindofpopularitythatappearsinadolescence:statusbornofpowerandevendishonorablebehavior.EnviableasthecoolkidsmayhaveseemedDr.Prinstein'sstudiesshowunpleasantconsequences.Thosewhowerehighestinstatusinhighschoolaswellasthoseleastlikedinelementaryschoolare'mostlikelytoengage从事indangerousandriskybehavior.'InonestudyDr.Prinsteinexaminedthetwotypesofpopularityin235adolescentsscoringtheleastlikedthemostlikedandthehighestinstatusbasedonstudentsurveys调查研究.'Wefoundthattheleastwell﹣likedteenshadbecomemoreaggressiveovertimetowardtheirclassmates.Butsohadthosewhowerehighinstatus.Itclearlyshowedthatwhilelikabilitycanleadtohealthyadjustmenthighstatushasjusttheoppositeeffectonus.'Dr.Prinsteinhasalsofoundthatthequalitiesthatmadetheneighborswantyouonaplaydate﹣sharingkindnessopenness﹣carryovertolateryearsandmakeyoubetterabletorelateandconnectwithothers.InanalyzinghisandotherresearchDr.Prinsteincametoanotherconclusion:Notonlyislikabilityrelatedtopositivelifeoutcomesbutitisalsoresponsibleforthoseoutcomestoo.'Beinglikedcreatesopportunitiesforlearningandfornewkindsoflifeexperiencesthathelpsomebodygainanadvantage'hesaid.1Whatsortofgirlwastheauthorinherearlyyearsofelementaryschool?A.Unkind.B.Lonely.C.Generous.D.Cool.2Whatisthesecondparagraphmainlyabout?A.Theclassificationofthepopular.B.Thecharacteristicsofadolescents.C.Theimportanceofinterpersonalskills.D.Thecausesofdishonorablebehavior.3WhatdidDr.Prinstein'sstudyfindaboutthemostlikedkids?A.Theyappearedtobeaggressive.B.Theytendedtobemoreadaptable.C.Theyenjoyedthehigheststatus.D.Theyperformedwellacademically.4Whatisthebesttitleforthetext?A.BeNice﹣YouWon'tFinishLastB.TheHighertheStatustheBetterC.BetheBest﹣YouCanMakeItD.MoreSelf﹣ControlLessAggressiveness
如图在棱长为2的正方体ABCD﹣A1B1C1D1中EFG分别是棱ABBCCC1的中点P是底面ABCD内一动点若直线D1P与平面EFG不存在公共点则三角形PBB1的面积的最小值为
Nowadayspeopletendtodigitaliseeverythingfromwatchestofridges.Itseemsyoucanchooseanyitemlabeledassmart.1Howeverthereareplentythatcanbeusedtoreduceemissionsandsavemoney. Ifyou'reapartofthedigitalisationmovementyoumightbeinterestedintheconceptofsmarthomes.Itmeansthateveryelementofyourhousecanbecontrolledfromapanelonthewalloryourphone.2Useyourmobiletopowerthemonoroffandyoumayfeeltrulymodernortrulylazy.Asidesfromthebenefitsoflivingamorecomfortablelifethispresentsanopportunitytocutdownonyourelectricalbills. Electricitygenerationtodayrepresents31%oftotalglobalfossilfueluseandaround40%ofallenergy﹣relatedCO2emissions.3Itisconsideredasthefirststeptopreventglobalclimatechange.Connectasmartthermometertotheheatingandcoolingsystemandsetaspecifictemperatureatwhichtheheatingbeginstowork.Doingsotheroomwillbeatadesiredtemperaturewhennecessaryandswitchesonapower﹣savingmodewhennotoccupied.SimilarlybyinstallingaCO2sensoryoucanhaveanautomatedventilation通风system.4 Ina150000m2officecomplexnearMunichcalledCampeonenergycostsofupto117067Euroweresavedaftertheuseofenvironmentalcontroldevicesthisyear.InthiswaytheyarecontributingtoalargedecreaseinCO2emissions.Clearlysmarthomesareaboutmuchmorethanjustlivingacomfortablelife.5 A.Itisactuallyaboutlivingagreenlife. B.Smartdeviceshavebeeninstalledworldwidenowadays. C.ItstartsworkingonlywhenCO2concentrationsreachacertainlimit. D.Thereseemtobeanoceanofsuchso﹣calledsmartinventions. E.Bearingthisinmindmeasuresshouldbetakentomakebuildingsmoreenergy﹣efficient. F.Alternativeenergymustbediscoveredbeforethefossilfuelrunsoutinthefuture. G.Thisincludesbasicssuchasheatingandlightingandmanyotherappliances.
1Whatwas'GreenBook'originallyinthe1960s?A.Adocumentaryrecordingthelifeoftheblacks.B.AguidebookforAfrican﹣Americanroadtrippers.C.Abookteachingtheblackstotobetolerant.D.Astoryaboutablackandawhiteonatour.2Whatdoes'ticklesthekeys'suggestaboutShirleyinPara3?A.Heperformsinhistour.B.HehelpsLiptogivethethugsabeat.C.HegetsusedtoLip'sbehaviors.D.Hedrivesthecar.3Whodoestheauthorthinkhighlyofintheend?A.Theauthorofthefilm.B.GreenBookinthe1960s.C.Thecritics.D.Thefilmactors.
Monkeysseemtohaveawaywithnumbers.AteamofresearcherstrainedthreeRhesusmonkeystoassociate26clearlydifferentsymbolsconsistingofnumbersandselectiveletterswith0﹣25dropsofwaterorjuiceasareward.Theresearchersthentestedhowthemonkeyscombined﹣oradded﹣thesymbolstogetthereward.Here'showHarvardMedicalSchoolscientistMargaretLivingstonewholedtheteamdescribedtheexperiment:Intheircagesthemonkeyswereprovidedwithtouchscreens.Ononepartofthescreenasymbolwouldappearandontheothersidetwosymbolsinsideacirclewereshown.Forexamplethenumber7wouldflashononesideofthescreenandtheotherendwouldhave9and8.Ifthemonkeystouchedtheleftsideofthescreentheywouldberewardedwithsevendropsofwaterorjuice;iftheywentforthecircletheywouldberewardedwiththesumofthenumbers﹣17inthisexample.Afterrunninghundredsofteststheresearchersnotedthatthemonkeyswouldgoforthehighervaluesmorethanhalfthetimeindicatingthattheywereperformingacalculationnotjustmemorizingthevalueofeachcombination.Whentheteamexaminedtheresultsoftheexperimentmorecloselytheynoticedthatthemonkeystendedtounderestimate低估asumcomparedwithasinglesymbolwhenthetwowerecloseinvalue﹣sometimeschoosingforexamplea13overthesumof8and6.Theunderestimationwassystematic:Whenaddingtwonumbersthemonkeysalwayspaidattentiontothelargerofthetwoandthenaddedonlyafraction小部分ofthesmallernumbertoit.'Thisindicatesthatthereisacertainwayquantityisrepresentedintheirbrains'Dr.Livingstonesays.'Butinthisexperimentwhatthey'redoingispayingmoreattentiontothebignumberthanthelittleone.'1Whatdidtheresearchersdotothemonkeysbeforetestingthem?A.Theyfedthem.B.Theynamedthem.C.Theytrainedthem.D.Theymeasuredthem.2Howdidthemonkeysgettheirrewardintheexperiment?A.Bydrawingacircle.B.Bytouchingascreen.C.Bywatchingvideos.D.Bymixingtwodrinks.3WhatdidLivingstone'steamfindaboutthemonkeys?A.Theycouldperformbasicaddition.B.Theycouldunderstandsimplewords.C.Theycouldmemorizenumberseasily.D.Theycouldholdtheirattentionforlong.4Inwhichsectionofanewspapermaythistextappear?A.Entertainment.B.Health.C.Education.D.Science.
已知B12是抛物线My2=2pxp>0上一点F为M的焦点.1若是M上的两点证明|FA||FB||FC|依次成等比数列.2若直线y=kx﹣3k≠0与M交于Px1y1Qx2y2两点且y1+y2+y1y2=﹣4求线段PQ的垂直平分线在x轴上的截距.
Everyyearabout40000peopleattempttoclimbKilimanjarothehighestmountaininAfrica.They1withthemlotsofwaste.The2mightdamagethebeautyoftheplace.Theglaciers冰川aredisappearingchangingthe3ofKilimanjaro. HearingthesestoriesI'm4abouttheplace﹣otherdestinationsaredescribedaspurernaturalexperiences. HoweverIsoon5thatmuchhaschangedsincethedaysofdisturbingreportsof6amongtonsofrubbish.Ifinda7mountainwithtoiletsatcampsandalongthepaths.Theenvironmentalchallengesare8buttheeffortsmadebytheTanzaniaNationalParkAuthorityseemtobe9. ThebestofaKilimanjaro10inmyopinionisn'treachingthetop.Mountainsare11asspiritualplacesbymanycultures.This12isespeciallyevidentonKilimanjaroas13gothroughfiveecosystems生态系统inthespaceofafewkilometers.Atthebaseisarainforest.Itendsabruptlyat3000meters14landsoflowgrowingplants.Furtheruptheweather15﹣lowcloudsenvelopethemountainsideswhicharecoveredwiththickgrass.I16twelveshadesofgreenfromwhereIstand.Above4000metersisthehighland17:gravel砾石stonesandrocks.18youclimbintoanarctic﹣likezonewith19snowandtheglaciersthatmaysoondisappear. DoesKilimanjaro20itsreputationasacrowdedmountainwithlinesoftouristsruiningtheatmosphereofpeace?Ifoundtheoppositetobetrue. 1A.keep B.mix C.connect D.bring 2A.stories B.buildings C.crowds D.reporters 3A.position B.age C.face D.name 4A.silent B.skeptical C.serious D.crazy 5A.discover B.argue C.decide D.advocate 6A.equipment B.grass C.camps D.stones 7A.remote B.quiet C.all D.clean 8A.new B.special C.significant D.necessary 9A.payingoff B.spreadingout C.blowingup D.fadingaway 10A.atmosphere B.experience C.experiment D.sight 11A.studied B.observed C.explored D.regarded 12A.view B.quality C.reason D.purpose 13A.scientists B.climbers C.locals D.officials 14A.holdingonto B.goingbackto C.livingupto D.givingwayto 15A.changes B.clears C.improves D.permits 16A.match B.imagine C.count D.add 17A.village B.desert C.road D.lake 18A.Obviously B.Easily C.Consequently D.Finally 19A.permanent B.little C.fresh D.artificial 20A.enjoy B.deserve C.save D.acquire
假定你是李华.最近你校的英语戏剧社社团EnglishDramaClub需要招募一批新成员你打算加入.请根据所给提示写一封自荐信.内容包括: 1.自我介绍包括兴趣和优势 2.参加这个社团的目的 3.希望被批准 注意:1.词数100左右 2.开头和结尾已给出但不计入总词数. DearSirorMadam I'mLiHuafromClass1Grade1. Yourssincerely LiHua
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. I'vehadmanydreamssinceIwasachild.Nowmydreamistoopensacafe.Thoughitmayappearsimpleitrequiredalotofideasandefforts.WhatIwantisnotjustanordinarilycafebutaveryspecialone.IwantmycafehaveaspecialthemesuchaslikeTangDynasty.Inthecafecustomerswillenjoyyourselvesinthehistoricalenvironmentwhatiscreatedforthem.IfIsucceedinmanageoneIwillopenmore.Iwishtohaveachainofcafesinmanydifferentcity.Eachofmycafeswillhaveadifferentthemeandanuniquestyle.
ForCanaanElementary'ssecondgradeinPatchogueN.Y.todayisspeechdayandrightnowit'sChrisPalaez'sturn.The8﹣year﹣oldisthejokeroftheclass.Withshiningdarkeyesheseemslikethekindofkidwhowouldenjoypublicspeaking.Buthe'snervous.'I'mheretotellyoutodaywhyyoushouldshould'Christripsonthe'﹣ld'apronunciationdifficultyformanynon﹣nativeEnglishspeakers.HisteacherThomasWhaleyisnexttohimwhisperingsupport.'Voteforme'ExceptforsomestumblesChrisisdoingamazinglywell.WhenhebringshisspeechtoaniceconclusionWhaleyinvitestherestoftheclasstopraisehim.AsonofimmigrantsChrisstartedlearningEnglishalittleoverthreeyearsago.Whaleyrecalls回想起howatthebeginningoftheyearwhencalledupontoreadChriswouldexcusehimselftogotothebathroom.LearningEnglishasasecondlanguagecanbeapainfulexperience.Whatyouneedisagreatteacherwholetsyoumakemistakes.'Ittakesalotforanystudent'Whaleyexplains'especiallyforastudentwhoislearningEnglishastheirnewlanguagetofeelconfidentenoughtosay‘Idon'tknowbutIwanttoknow.''Whaleygottheideaofthissecond﹣gradepresidentialcampaignprojectwhenheaskedthechildrenonedaytoraisetheirhandsiftheythoughttheycouldneverbeapresident.Theanswerbrokehisheart.Whaleysaystheprojectisaboutmorethanjustlearningtoreadandspeakinpublic.Hewantsthesekidstolearntoboast夸耀aboutthemselves.'Boastingaboutyourselfandyourbestqualities'Whaleysays'isverydifficultforachildwhocameintotheclassroomnotfeelingconfident.'1WhatmadeChrisnervous?A.Tellingastory.B.Makingaspeech.C.Takingatest.D.Answeringaquestion.2Whatdoestheunderlinedword'stumbles'inparagraph2referto?A.Improperpauses.B.Badmanners.C.Spellingmistakes.D.Sillyjokes.3WecaninferthatthepurposeofWhaley'sprojectisto.A.helpstudentsseetheirownstrengthsB.assessstudents'publicspeakingskillsC.preparestudentsfortheirfuturejobsD.inspirestudents'loveforpolitics4WhichofthefollowingbestdescribesWhaleyasateacher?A.Humorous.B.Ambitious.C.Caring.D.Demanding.
在△ABC中3sinA=2sinB. 1求cos2C 2若AC﹣BC=1求△ABC的周长.
TheSpanishsculptorIsaacCordalseesthecityashisplayground.Hespecializesinminiatureastreetartoftenrepresentingasocialcommentaryasacriticalobservationoncapitalismpowerandsoon.Cordalfirstmodelsthesculpturesinclaythenreproducesthemincement水泥about15cminheight.'Asamaterialcementseemsverysymbolicbecauseitisoneofourmostrecognizablefootprintsagainstnature.'hesays.'Todaywehavebeentoousedtocementcityhabitat.'Forseveralyearshe'sbeenworkingontheprojectCementEclipsesreferringtothestatewhenabuildingcoversthesun:'It'sacriticalreflectionontheideaofprogress.'ThesetinycementfigureshaveappearedincitiesacrossEuropefoundsittingontopofbussheltersordrowninginthegrasslandofthebigcity.'ThestreetbecameaperfectsettinginwhichIcouldfindenoughlandscapesforthem.Duetotheirsmallsizeandcolortheygoreallywellintotheurbanenvironment.Theyevennormallygounseenbypassersby.I'mveryinterestedinthatmomentofsurprisewhensomeoneaccidentallydiscoversthem.'hesays.'Nowadaysthereisafearofnotbeingseeninthepublicareasoeverythingisalwaysbigandbold.Webecomeaproductofthisanddonotfocusinasmuch.Ithinkitisgoodtopayattentiontosmalldetails.Myworkisarewardforthosewhodoanditallowsustounderstandandchangetheworldwehavecreatedinadifferentangle.'Cordalsays.1Whichofthefollowingbestexplains'miniature'Underlinedinparagraph1?A.Tinysculpture.B.Smallplayground.C.Socialcomments.D.Criticalobservation.2What'sCordal'sattitudetowardcementcityhabitat?A.Indifferent.B.Critical.C.Neutral.D.Supportive.3WhatdoesCordalintendtotellusinthelastparagraph?A.Everythingbiginpublicisattractive.B.Beingsmallmaybeafearinpublic.C.Weneedtofocusonthedetailsoftheproducts.D.Hisworkhelpsustoseetheworlddifferently.4Whatdoesthetextmainlytalkabout?A.Cordalandhisstreetart.B.Waystobeasculptor.C.Materialsusedforsculptures.D.Reflectionsoncityprogress.
AlbertEinsteinthegeniusbehindthetheoryofrelativityhasrecentlybeenmakingheadlinesagain.Howeverthistimeitisnotforanewscientificbreakthrough1forahandwrittennotehegaveabellboy95yearsago. InOctober1922EinsteinwasdeliveringaseriesoflecturesinJapan2hereceivedatelegraminforminghimthathe3awardtheNobelPrizeforPhysics. Though4pleaseatthenewstheNobelwinnerdecidedtocontinuewithhisJapanesetripinsteadof5headtoStockholmtoacceptthehonor. WhileinTokyohepenned6noteinGermansayingAquietandhumblelifewillbringmore7happythanthepursuitofsuccess…PerhapshehadnoloosechangetotipabellboycomingtodeliverthemessagehegavehimthenoteandtoldhimMaybeifyouareluckythenote8becomemorevaluablethanjustaregulartip. Earlierthisyearthebellboy'snephewdecidedtohandittoJerusalem﹣basedWinner'sAuctions拍卖andExhibitions.Thenotewasthenputupforauction9mightbringtheownerasurprising$1.56million10aEuropeanbuyer.ItwasarecordforanauctionofadocumentinIsraelandthewild﹣hairedscientistdeservedit.
x﹣7的展开式的第2项为.
中国古代数学家朱世杰所著算学启蒙一书中提到关于“松竹并生”的问题松长五尺竹长两尺松日自半竹日自倍松竹何日而长等.意思是“现有松树高5尺竹子高2尺松树每天长自己高度的一半竹子每天长自己高度的一倍问在第几天会出现松树和竹子一般高”如图是源于其思想的一个程序框图若输入x=5y=2问输出n的结果为
设函数fx=|x﹣1|+|x+3|. 1求不等式|fx﹣6|<1的解集 2证明4﹣x2≤fx≤2|x|+4.
ForWesterndesignersChinaanditsrichculturehavelongbeenaninspirationforWesterncreative.'It'snosecretthatChinahasalwaysbeenasource来源ofinspirationfordesigners'saysAmandaHillchiefcreativeofficeratA+ENetworksaglobalmediacompanyandhometosomeofthebiggestfashion时尚shows.EarlierthisyeartheChinaThroughALookingGlassexhibitioninNewYorkexhibited140piecesofChina﹣inspiredfashionableclothingalongsideChineseworksofartwiththeaimofexploringtheinfluenceofChineseaesthetics美学onWesternfashionandhowChinahasfueledthefashionableimaginationforcenturies.TheexhibitionhadrecordattendanceshowingthatthereishugeinterestinChineseinfluences.'Chinaisimpossibletooverlook'saysHill.'ChinesemodelsarethefacesofbeautyandfashioncampaignsthatselldreamstowomenallovertheworldwhichmeansChinesewomenarenotjustconsumersoffashion﹣theyarecentraltoitsmovement.'Ofcoursenotonlyaretoday'stopWesterndesignersbeinginfluencedbyChina﹣someofthebestdesignersofcontemporaryfashionarethemselvesChinese.'VeraWangAlexanderWangJasonWuaretakingonGallianoAlbazMarcJacobs﹣andbeatingthemhandsdownindesignandsales'addsHill.ForHillitisimpossiblenottotalkaboutChinaastheleadingplayerwhendiscussingfashion.'ThemostfamousdesignersareChinesesoarethemodelsandsoaretheconsumers'shesays.'Chinaisnolongerjustanothermarket;inmanysensesithasbecomethemarket.IfyoutalkaboutfashiontodayyouaretalkingaboutChina﹣itsinfluencesitsdirectionitsbreathtakingclothesandhowyoungdesignersandmodelsarefinallyacknowledgingthatinmanyways.'1WhatcanwelearnabouttheexhibitioninNewYork?A.Itpromotedthesalesofartworks.B.Itattractedalargenumberofvisitors.C.ItshowedancientChineseclothes.D.ItaimedtointroduceChinesemodels.2WhatdoesHillsayaboutChinesewomen?A.Theyaresettingthefashion.B.Theystartmanyfashioncampaigns.C.Theyadmiresupermodels.D.Theydobusinessallovertheworld.3Whatdotheunderlinedwords'takingon'inparagraph4mean?A.learningfromB.lookingdownonC.workingwithD.competingagainst4Whatcanbeasuitabletitleforthetext?A.YoungModelsSellingDreamstotheWorldB.AChineseArtExhibitionHeldinNewYorkC.DifferencesBetweenEasternandWesternAestheticsD.ChineseCultureFuelingInternationalFashionTrends
Theyhadbeenon1weplanetsformillionsofyearsbut2018wastheyearseveralspecies2officialdiedoffforever.Threebirdspecieswentextinctthisyeartwoof3aresongbirdsfromnortheasternBrazil.A4disturbtrendisthatmainlandspeciesarestartingtogoextinctratherthanislandspecies.Thespecies5wipeoutinthewildresultedfrommanyfactorssuchasthecreationofdamandtrapping6trade.Beyondbirdsotheranimalssuchasthevaquitaandthenorthernwhiterhino7beneartheend.Wearecurrentlyexperiencingtheworstspeciesdie﹣offssincethe81oseofthedinosaurs65millionyearsago.Althoughextinctionisa9naturephenomenonitoccursatarateofaboutonetofivespeciesperyear.Scientistsestimatewe'renowlosingspeciesat1000to10000timestherate.Inthepast500yearsabout1000species10goextinct.
一个样本容量为10的样本数据它们组成一个公差为2的等差数列{an}若a1a3a7成等比数列则此样本的平均数和中位数分别是
设集合A={x∈R|x>2}B={x∈R|x2﹣3x≤0}则A∩B等于
Ifyoufollowtheseinsidertipsyourphotoswilllooklikeyouhadtheplacetoyourselfatthepopulartouristattractions.VaticanMuseums:VaticanCityTheVaticandrawsmorethanfivemillionpeopleeachyearandqueuescanreachfourhoursduringpeakseason.ChristieHudsonseniorcommunicationsmanageratExpediarecommendschoosingaskip﹣the﹣1inetour.'Thisnotonlyletsyouavoidtheticketcounterbutalsoincludestheuseofaprivatepartnerentrance.'ExtratimetovisittheSistineChapel?Yes!BambooForest:KyotoJapanBambooForestisthemostworthysightinKyoto.Ⅱyou'relongingtoenjoythepathwaysandtakepicturesintotalquietnessKyotoArashiyamaTravelGuiderecommendshittingthefamousBambooGrovePathasearlyinthemorningaspossible﹣think7a.m.ifyou'reupforit.Don'tmissthesehiddentreasuresyoucanonlywitnessinJapan.ChichenItza:YucatánMexicoHometoE1CastilloandtheTempleoftheWarriorsChichenItzaisamust﹣see.Wanttobeattherush?Scheduleanearlytourthattakesplacebeforeasiteopenstothepublic.Ledbyanarchaeologistguideit'sfulloffascinatinginsightsandfacts﹣withouttonsofpack﹣wearingtourists.LouvreMuseum:ParisFranceTheLouvreisoneofthemostpopularmuseumsontheplanet.Ifwaitingaroundinlinetogetinisn'tthewayyouprefertospendyourtimeinParisconsiderpurchasingareservedticket.Thiswillgiveyouentrytothepyramidwithinahalf﹣hourwindow.TheLouvreisalsoopenuntil9:45p.m.onWednesdaysandFridaysifyou'reupforsomelate﹣nightartvisits.1WhatisrecommendedatVaticanMuseumsbyChristieHudson?A.Queuingfourhours.B.Jumpingthewaitingline.C.Takingaskip﹣the﹣linetour.D.VisitingtheSistineChapel.2Whichofthefollowingareavailableforearlytouriststoavoidtherush?A.VaticanMuseumsandBambooForest.B.ChichenItzaandBambooForest.C.BambooForestandLouvreMuseum.D.ChichenItzaandLouvreMuseum.3Whomightthispassagebeintendedfor?A.Visitorsinterestedinmuseums.B.Guidesatthetouristattractions.C.Peopleattheticketcounter.D.Touriststobeattherush.
已知函数fx=+ax+3gx=x3若∀mn∈[]fm﹣gn≥0则实数a的取值范围为
已知函数fx的导函数f′x满足x+xlnxf′x>fx对x∈1+∞恒成立. 1判断函数gx=在1+∞上的单调性并说明理由 2若fx=ex+mx求m的取值范围.
假如你是校英文报编辑李华.你校原定于本星期五下午在302室举办的英文经典片段配音比赛EnglishDubbingContest因故需更改时间和地点.请你写一封电子邮件通知评委中的外教Mrs.Jenkins内容包括: 1.比赛更改原因; 2.更改后的安排; 3.表达歉意. 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯.
数列{an}是等差数列{bn}是各项均为正数的等比数列公比q>1且a5=b5则
若函数fx=1+|x|+则flg2+flg+flg5+flg=.
Theworldisagreenerplacethanitwas20yearsago.Astudypublishedinthejournal'NatureSustainability'saidthatrecentsatellitedatarevealsagreeningpatternthatisstrikinglyprominentinChinaandIndia.ThestudyshowsthathumanactivityinChinaandIndiadominatesthisgreeningoftheplanetthankstotreeplantingandagriculture.Theeffectcomesmostlyfromambitioustree﹣plantingprogramsinChinaandintensiveagricultureinbothcountries.'ChinaandIndiaaccountforone﹣thirdofthegreening'saidleadauthorChiChenofBostonUniversity.'Thatisasurprisingfindingconsideringthevagueideaoflanddegradation毁坏inpopulouscountriesfromoverexploitation'addedChen.Chinaaloneaccountsfor25percentoftheglobalnetincreaseinleafareawithonly6.6percentofglobalvegetatedarea.ThegreeninginChinaisfromforests42percentandcroplands32percentbutinIndiaitismostlyfromcroplands82percentwithminorcontributionfromforests4.4percent.China'soutsizedcontributiontotheglobalgreeningtrendcomesinlargepartfromitsprogramstoconserveandexpandforestswiththegoalofpreventinglanddegradationairpollutionandclimatechange.'Oncepeoplerealizethereisaproblemtheytendtofixit'saidRamaNemaniresearchscientistandco﹣authorofthestudy.'Inthe1970sand80sinIndiaandChinathesituationaroundvegetationlosswasnotgood.Inthe1990speoplerealizeditandtodaythingshaveimproved.Nowweseethathumansarecontributing.'LandareausedtogrowcropsiscomparableinChinaandIndia﹣morethan770000squaremiles﹣andhasnotchangedmuchsincetheearly2000s.Yettheseregionshavegreatlyincreasedboththeirannualtotalgreenleafareaandtheirfoodproduction.Thiswasachievedthroughmultiplecroppingpracticeswhereafieldisreplantedtoproduceanotherharvestseveraltimesayear.Productionofgrainsvegetablesfruitsandmorehaveincreasedbyabout35%~40%since2000tofeedtheirlargepopulations.1Whatdidthestudymainlyfind?A.IndiaandChinaareleadingtheglobalgreeningeffort.B.Intensiveagricultureisthecauseofgloballanddegradation.C.ChinaandIndiahasgotthelargestforestcoverageintheworld.D.Agricultureismorehelpfulinexpandinggreenareasthantree﹣planting.2HowisChinadifferentfromIndiaincontributingtotheglobalgreening?A.Indiareducedcroplandtopreventtheoverexploitation.B.Indiaincreasedforestbyplantingaroundcroplands.C.Chinachangedmorelandsintoforestbyplantingtrees.D.Chinacontrolledtheincreaseofitspopulation.3WhatdoesNemanithinkabouthumansinChinaandIndiainprotectingtheEarth?A.Ambitious.B.Responsible.C.Passionate.D.Tolerant.4Whatdoesthepassagefinallysuggesthumansshouldmakegooduseof?A.Forest.B.Trees.C.Cropland.D.Food
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. Ibecameinterestinginplayingfootballthankstoasmallaccident.OneafternoonwhereIwasinprimaryschoolIwaswalkingbytheschoolplayground.Suddenlyfootballfelljustinfrontofmebutalmosthitme.Istoppedtheballandkickedithardlybacktotheplayground.Toeveryone′ssurprisingtheballwentintothenet.AllthefootballplayerontheplaygroundcheeredloudlysaythatIhadatalentforfootball.FromnowonIstartedtoplaymyfootballwithclassmatesafterschool.Iamagoodplayernow.
ThesmalltownofRjukaninNorwayissituatedbetweenseveralmountainsanddoesnotgetdirectsunlightfromlateSeptembertomid﹣March﹣1sixmonthsoutoftheyear. Ofcoursewe2itwhenthesunisshiningsaysKarinRowhoworksforthetown'stourismoffice.Weseetheskyis3butdowninthevalleyit'sdarker﹣it'slikeona4day. Butthat5whenasystemofhigh﹣tech6wasintroducedtoreflectsunlightfromneighboringpeaks山峰intothevalleybelow.Wednesdayresidents居民ofRjukan7theirveryfirstrayofwintersunshine:Arowofreflectiveboardsonanearbymountainsidewereputto8.Themirrorsarecontrolledbyacomputerthat9themtoturnalongwiththesunthroughoutthe10andtocloseduringwindyweather.Theyreflectaconcentratedbeam束oflightontothetown'scentral11creatinganareaofsunlightroughly600squaremeters.Whenthelight12Rjukanresidentsgatheredtogether. Peoplehavebeen13thereandstandingthereandtaking14ofeachotherRosays.Thetownsquarewastotally15.Ithinkalmostallthepeopleinthetownwerethere.The3500residentscannotall16thesunshineatthesametime.17thenewlightfeelslikemorethanenoughforthetown's18residents. It'snotvery19shesaysbutitisenoughwhenweare20. 1A.only B.obviously C.nearly D.precisely 2A.fear B.believe C.hear D.notice 3A.empty B.blue C.high D.wide 4A.cloudy B.normal C.different D.warm 5A.helped B.changed C.happened D.mattered 6A.computers B.telescopes C.mirrors D.cameras 7A.remembered B.forecasted C.received D.imagined 8A.repair B.risk C.rest D.use 9A.forbids B.directs C.predicts D.follows 10A.day B.night C.month D.year 11A.library B.hall C.square D.street 12A.appeared B.returned C.faded D.stopped 13A.driving B.hiding C.camping D.sitting 14A.pictures B.notes C.care D.hold 15A.new B.full C.flat D.silent 16A.block B.avoid C.enjoy D.store 17A.Instead B.However C.Gradually D.Similarly 18A.nature﹣loving B.energy﹣saving C.weather﹣beaten D.sun﹣starved 19A.big B.clear C.cold D.easy 20A.trying B.waiting C.watching D.sharing
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