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直线l过点A（﹣1，﹣2），且不经过第四象限，则直线l的斜率的取值范围为 ．
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高二上学期数学《》真题及答案
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在平面直角坐标系中若直线经过第一三四象限则直线不经过的象限是
第一象限
第二象限
第三象限
第四象限
若直线l的一般式方程为2x－y＋1＝0则直线l不经过
第一象限
第二象限
第三象限
第四象限
直线y＝－3x＋2不经过的象限为
第一象限
第二象限
第三象限
第四象限
已知直线y=k﹣1x+b与y=3x﹣2平行且过点1﹣2则直线y=bx﹣k不经过
第一象限
第二象限
第三象限
第四象限
直线l的解析式是y=kx+2其中k是不等式组的解则直线l的图象不经过
第一象限
第二象限
第三象限
第四象限
如果一条直线l经过不同的三点
(a，b)，
(b，a)，
(a-b，b-a)，那么直线l经过 ( )A.第二、四象限B.第一、二、三象限 C. 第一、三象限
第二、三、四象限
在平面直角坐标系中过10点且倾率为﹣1的直线不经过
第一象限
第二象限
第三象限
第四象限
直线l的解析式是y=kx+2其中k是不等式组的解则直线l的图象不经过
第一象限
第二象限
第三象限
第四象限
直线y=－x－2不经过
第一象限
第二象限
第三象限
第四象限
已知直线l:kx－y＋1＋2k＝0k∈R..1证明直线l过定点2若直线不经过第四象限求k的取值范围3
平行于直线y=x的直线l不经过第四象限且与函数y=x＞0和图象交于点A过点A作AB⊥y轴于点BAC
已知直线l:kx-y+1+2k=0K∈R1证明直线l过定点2若直线l不经过第四象限求K.的取值范围3
若函数y=的图象过点1﹣2则直线y=kx+1不经过
第一象限
第二象限
第三象限
第四象限
直线l过点12和第一二四象限若l的两截距之和为6求直线l的方程.
直线l过点
(1,2)，且不过第四象限，则直线l的斜率k的最大值是( ) A.0
1
2
已知直线lkx－y＋1＋2k＝0k∈R.1证明直线l过定点2若直线l不经过第四象限求k的取值范围3若
已知直线l:kx-y+1+2k=0k∈R.1证明:直线l过定点;2若直线l不经过第四象限求k的取值范
如果直线l将圆x－12＋y－22＝5平分且不通过第四象限那么l的斜率的取值范围是________.
直线l是以二元一次方程8x﹣4y=5的解为坐标所构成的直线则该直线不经过的象限是
第一象限
第二象限
第三象限
第四象限
直线y=﹣x﹣2不经过
第一象限
第二象限
第三象限
第四象限
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在△ABC中角ABC的对边分别为abca＝3． Ⅰ求c的值 Ⅱ若D为BC边上的点并且求∠ADB．
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Theideaofturningrecycledplasticbottlesintoclothingisnotnew.Duringthelastfiveyearsalargenumberofclothingcompaniesbusinessesandenvironmentalorganizationshavestartedturningplasticsintofabrictodealwithplasticpollution.Butthere'saproblemwiththismethod.Researchnowshowsthatmicrofiberscouldbethebiggestsourceofplasticinthesea. Dr.MarkBrowneinSantaBarbaraCaliforniahasbeenstudyingplasticpollutionandmicrofibersfor10yearsnow.Heexplainsthateverytimesyntheticclothesgointoawashingmachinealargenumberofplasticfibersfalloff.Mostwashingmachinescan'tcollectthesemicrofibers.Soeverytimethewatergetsoutofawashingmachinemicrofibersareenteringthesewersandfinallyendupinthesea. In2011Brownewroteapaperstatingthatasinglepieceofsynthetic合成的clothingcanproducemorethan1900fibersperwash.Brownecollectedsamplesfromseawaterandfreshwatersitesaroundtheworldandusedaspecialwaytoexamineeachsample.Hediscoveredthateverysinglewatersamplecontainedmicrofibers. Thisisbadnewsforanumberofreasons.Plasticcancauseharmtosealifewheneaten.Studieshavealsoshownthatplasticcanabsorbotherpollutants. Basedonthisevidenceitmayseemsurprisingthatcompaniesandorganizationshavechosentoturnplasticwasteintoclothingasanenvironmentalsolution.EventhoughthesciencehasbeenaroundforawhileBrowneexplainsthathe'shadadifficulttimegettingcompaniestolisten.Whenheaskedwell﹣knownclothingcompaniestosupportBenignbyDesign﹣hisresearchprojectthatseekstogetclothesthathaveabadeffectonhumansandtheenvironmentoutofthemarketBrownedidn'tgetasatisfyinganswer.Onlyonewomen'sclothingcompanyEileenFisherofferedBrownefunding. 1Whathashappenedduringthepastfiveyears? A.Fabrichasbecomemuchstronger. B.Plasticpollutionhasbeenlessserious. C.Manyplasticbottleshavebeenreused. D.Microfibershavebeengreatlyimproved. 2WhatdoesBrownethinkofwashingsyntheticclothes? A.Itisaddingmicrofiberstotheclothes. B.Itisworseningenvironmentalproblems. C.Itismakingsyntheticclotheslastlonger. D.Itisdoinggreatdamagetowashingmachines. 3WhatcanbeinferredaboutBrowne'sBenignbyDesignresearchproject? A.Ithasachievedgreatsuccess. B.Ithasn'tgotanythingdone. C.Itisknowntoveryfewpeople. D.Itisfacingsomedifficulties. 4What'sthebesttitleforthetext? A.It'simportanttolearntorecycle B.It'snevereasytosolvepollutionproblems C.Recycledplasticclothingsolutionorpollution? D.Arehumanbeingsmovingforwardorbackward?
ManypeoplebelievethatthereissometruthinthesayingLaughteristhebestmedicine.1Laughterhelpsrelievepainstrengthentheimmunesystemandreducestress.Laughterstimulates激发hormoneswhichmakeusfeelhappy.Laughteralsoincreasestheflowofbloodthroughoutthebodyandhasbenefitswhicharesimilartotheonesyougetbydoingexercise. 2Childrenexposedtofunnyfilmsandcartoonsbeforemajormedicalproceduresareabletocopebetterwithpainandanxiety.3.Theseareprofessionalclownswhoaresenttohospitalsandwardstoentertainanddistractsickchildren. Laughtertherapyhasbecomeverypopularinrecentyearsandasaresultmoreandmorelaughterclubsarestartingtoopenupincitiesandtownsallovertheworld.Atalaughtersessionatrainedtherapistinstructsthegrouptoperformaseriesofexerciseswhicharedesignedtoproducelaughter.4Andittakesthemsometimetogetridoftheirinhibitions心理抑制.Theymightevenstartoffwithfakelaughterbutthisdoesn'tmatterbecauseourbodiescan'ttellthedifferenceandtheresultsarethesame.Moreoverlaughteriscontagious传染的.5 Sonexttimeyoufeelillstressedoutordepressedtrywatchingafunnyfilmortryrememberinganamusingincidentinyourlife.Youwillsoonfeelbetter. A.Ifonepersonstartsgigglingitisunavoidablethateveryoneelsewillbedrawnin. B.Laughterhelpsyoufocus. C.Thisfindinghasledtoso﹣calledclowndoctors. D.Infactresearchdonebyscientistshasshownthatlaughterhasalotofhealthbenefits. E.Laughtermakestheworldabetterandmorecolorfulplace. F.Somepeoplemayfindtheideaembarrassingatfirst. G.Usinglaughtertherapyinchildren'shospitalshasproventobeinvaluable.
假设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处错误每句中最多有两处错误.错误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. Inordertoencouragetheseniorstotakeexerciseandrelaxthemwearegoingtoorganizeamountain﹣climbingactivityinApril10.Weweretogatherattheschoolgateandstartat720a.m.bybusandgetbackat700p.m.We'llclimbMangshanMountaininthemorningonwhichtopwe'llhaveapicnicatthenoon.Intheafternoonwe'llbedividedintogroupandhaveafreetime.Remembertakephotosandmakenotesforthephotoexhibitionortheessaycontesttobeheldlateatourschool.Besidestakingyourlunchanddrinkingwaterwithyou.UnlessyouwanttojoinpleasecometoStudents'UnionandsignupbeforeApril5.
Textingwhilecrossingthestreetwillsoon1baninHonoluluHawaii.FromOctober2youcouldbefinedifyoustepintoaHonolulustreetwhilelookingatyourphone.HonoluluisthefirstmajorU.S.citythatpassedalaw3saysNopedestrianshallcrossastreetorhighwaywhileviewingamobileelectronicdevice. Thelaw4includeallelectronicdeviceswithscreenscellphonestabletsgamingdevicesdigitalcamerasandlaptopcomputers.Thelawdoespermit5exception.Pedestriansmayusesuchdevicesinthestreettocallemergencyservicesandrescueworkerssuchasfirefightersandpolice6office. 7hopeitwilllowerthenumberofpeoplehitand8killbycarsinthecity.PedestriansdeathsinAmericahavebeencontinuouslyincreasingastheuseofcellphonesrises.Honoluluhas9muchpedestrianshitincrosswalksthanalmostanyothercityinAmerica.Thenumberofpedestriandeathsin201610riseto600011%higherthan2015.
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.错误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.每处错误及其修改仅限一词. 2.只允许修改10处多者从第11处起不计分. March5thisadayinhonorofLeiFengwhopeoplearecalledontohelpothers.OnthemorningofthatdaythisyearourclassmettheschoolgateandwenttoaHopePrimarySchoolbythebus.Uponarrivingtheretheygaveusawarmlywelcome.Wegavethestudentssomebooksfoodorclothes.Andthenweplayedseveralgamewiththemandtoldthemstories.Beforeweleavewetookaphotowiththem.Seetheirsmilingfaceswebothfeltasenseofhappiness.Wearrivedhomeandpromisedtogobackwheneverpossible.Howanunforgettableexperienceitwas!
OnNovember7LewisPughcompletedaone﹣kilometerswiminthefreezingwatersofKingEdwardCoveoffSouthGeorgiainAntarctica.Hewaswearingonlyhisswimmingglassescapandspeedos! Pughisanadvocateforouroceansandseasworkingtoprotecttheseecosystemwiththeirlargediversityofmarinelife.Whenaskedwhyhedoesn'twearawetsuitLewissaysIaskworldleaderstodoeverythingtheycantoprotectouroceans.Sometimesthestepstheyneedtotakearedifficultandunpopular.IfI'maskingthemtobecourageousImustalsobe.Swimminginawetsuitwouldnotsendtherightmessage. IttookPughabout19minutestocompletetheone﹣kilometerswiminAntarcticawherethewateraveragedabout1.6degreesCelsius.Hesaysthathisbodycanonlytolerateabout20minutesinthefreezingwatersbeforeitstartsshuttingdown.Asheswimshisbodytemperaturesteadilydropswhichinturncauseshismusclecontroltodropslowinghimdown.Whenheisdonewithhisswimhissupportteamrusheshimtoahotshowerandittakesalmostanhourforhisbodytemperaturetoreturntonormal. DoctorsandPughcautionthatonemustreceivemonthsoftrainingtoswiminsuchcoldwaters.Evenexpertswimmerswhoareunusedtofreezingwatercandrownwithinminutesbecauseofthephysicalshockexperiencedbythebody.Pughsayshetrainedforsixmonthsbeforethisswim. ThisisnotthefirsttimethatLewishasswumindangerousconditions.In2007heswamonekilometerintheNorthPoletodrawattentiontothemeltingArcticiceduetoclimatechange.In2015heswamintheBayofWhalesinAntarctica'sRossSeaaspartofhissuccessfulcampaigntohelpsetupamarinereservethere. 1WhydidLewisPughswimwithoutawetsuit? A.Toswimfaster. B.Toshowhisbravery. C.Tobuilduphisbody. D.Towinpublicattention. 2WhatdoestheunderlinedworditinParagraph3referto? A.Hisbody. B.Thewater. C.Hisbodytemperature. D.Thewatertemperature. 3What'sPugh'sadviceaboutswimminginfreezingwaters? A.Onemustbefullyprepared. B.Oneshouldbeexpertatswimming. C.Oneshouldbereadytotakeonchallenges. D.Onemustbeusedtolong﹣distanceswimming. 4Whatmaybethebesttitleforthetext? A.LewisPughswimmingforacause B.Howtosurviveaswimincoldwaters C.Howtoprepareforextremeswimming D.LewisPughachievingtheimpossible
1WhenyoutakeReadingintheDigitalAgeyouwill. A.walkintodifferentpeople'slife B.learnwaysofunderstandingtexts C.getbetteratcomputerskills D.shareopinionswithliteraryscholars 2WhowillhelpstudentsbetterunderstandthethemesofShakespeare'splays? A.Actors. B.Scholars. C.Historians. D.Videotutors. 3WhatcanpeoplelearnfromTheEuropeanDiscoveryofChina? A.China'sdiscoveryoftheWest. B.TheriseandfalloftheQingDynasty. C.TheimportanceoftheSilkRoad. D.China'sinterestinWesterntravellers. 4Whatarethesubjectsoftheseonlinecourses? A.Scienceandhistory. B.Mediaandhealth. C.Natureandenvironment. D.Languageandculture. 5Inwhichwaydothethreecourseshaveincommon? A.Theyareaimedatstudents. B.Theyareprovidedforfree. C.Eachlasts6weeks. D.Eachtakes2hoursperweek.
已知椭圆Ma＞b＞0的长轴长为6且经过点过点P并且倾斜角互补的两条直线l1l2与椭圆M的交点分别为BC点B在点C的左侧点E﹣70．Ⅰ求椭圆M的方程Ⅱ求证四边形PEBC为梯形．
设{an}是等比数列且a2a4＝a5a4＝27则{an}的通项公式为．
WhenHuangLizhitookherfirstclassinAfricansociologyattheUniversityoftheWitwatersrandinSouthAfricainFebruaryherprofessoraskedherandherclassmateswhatimpressesthemmostwhenitcomestoAfrica. UnexpectedlyHuang31foundthatwordslikepovertyandsafari﹣negativewordsthatwereoftenassociatedwiththecontinentinmediareports﹣werethekindoftermsherAfricanclassmatesdidn'twanttohear.InsteadtheypreferredtohearthequestionansweredinthiswayAfricaisthecradleofhumankindandAfricansarepassionateandgenerous. Apparentlytherearesomemisunderstandingsbetweenus.It'struethatwithincidentsliketheEbolaoutbreakinWesternAfricaandtheemergence出现ofpiratesoffthecoastofSomaliahittingthenewsit'seasyforustokeepforgettingthatAfricahasoneoftheworld'soldestcivilizations﹣Egyptbornbytheworld'slongestrivertheNile.TheproofisintheGreatPyramidofGizaandtheGreatSphinxofGizawhicharebothpopularamongtourists.AndthetombsofancientEgypthavealsobecomeendlesssourcesfortheliteratureandfilmindustries. WhenitcomestothenaturalenvironmentofAfricaourmisunderstandingsareonlybigger.Butthetruthisthatinsteadofbeingextremelyhotallyearandcoveredbydesertthecontinenthaslargeareasofsavannas稀树草原wherelionsgiraffesandzebraslivethesnowcappedKilimanjaro﹣thehighestmountaininAfrica﹣andeventhickforestontheislandofMadagascar.Thesemisunderstandingsareoneofthereasonswhythe2018BeijingSummitoftheForumonChina﹣AfricaCooperationwasheldonSept3and4﹣tounderstandeachotherbetter. IndeedonlybyvisitingAfricaherselfdidHuangseetheconvenientlivingconditionstheamazingnaturalbeautyandthefriendlypeople.InhereyesherclassmateswereashopefulaboutthefutureoftheirowncountriesastheywereaboutAfricaasawholeandtheywerequicktodemonstrateboththeirstrongwillandactivity.AtthatmomentIknewexactlywhattheywanted﹣theywantedtheirculturetoberespected. 1Whichofthefollowingbestexplainscradleunderlinedinparagraph2? A.Asmallbedforbabies. B.Abaskettoholdsomething. C.Aplaceforpeopletorelaxthemselves. D.Aplacewheresomethingimportantbegan. 2WhatcanweinferaboutAfricaaccordingtothepassage? A.Itisveryhotalltheyearround. B.It'snotasafecontinenttolivein C.It'sdifferentfromwhatweimagine. D.Itisboundtohaveabrightfuture 3WhichofthefollowingwouldHuangagreewith? A.Toseeistobelieve B.Thinktwicebeforeyoudo C.Amissisasgoodasamile D.Don'tjudgeapersonbyhisappearance 4Whatcanbeasuitabletitleforthetext? A.ValuingaCulture. B.UnderstandingAfrica. C.PayingaVisittoAfrica. D.DiscoveringaContinent.
Haveyoucomplained1yourfamilyyourbossorevenyourlife?Maybeeveryonehasbutafterreadingthisstoryyoumaychangeyourviewandtreattheworldwithanotherattitude. Anass驴2belongtoanherb﹣sellerwhogavehimtoolittlefoodandtoomuchworkcouldnotbearthelifeanylonger.SohemadearequesttoGodtobereleasedfromhispresentserviceandprovidedwith3master.Afterwarninghim4hewouldregretdoingitGodmadehimtobesoldtoatile﹣maker.Shortlyafterwardstheassfoundthathehad5heavyloadstocarryandharderworkinthebrick﹣fieldandaskedforanotherchangeagain.Godtellinghimthatitwouldbe6lasttimethathecouldsatisfyhisrequestmadehimsoldtoatanner皮革工.Theassfoundthathe7fallintoworsehands.Knowinghisnewmaster'soccupationhesaidItwouldhavebeenbetterformeeithertohavebeenstarvedbythefirstowner8tohavebeenoverworkedbythesecond.ButnowIhavealreadybeenboughtbymypresentowner9willpeeloffmyskinevenafterIamdeadandmakemeuseful. Wecanseethatpeoplewithdissatisfactioninaplacearenot10liketofindhappinessinanother.
Organic有机的farmingisatypeofagriculturethatbenefitsfromtherecyclinganduseofnaturalproducts.Useofdriedplantsnotonlysavesmoneybutalsoensuresthegrowthofcrops.Thetechniqueischaracterizedbytheuseofgreenmanure肥料biologicalpestcontrolmethodsandspecialfarmingtechniquestokeepsoilproductive.Limitingtheuseofman﹣madechemicalsorcompletelydoingawaywiththemreducestheriskofdiseases.Todayorganicfarmingisamajorandpreferredindustryaroundtheworld.Organicallygrownfoodproductshaveahugemarketwithfarmlandscoveringabout10%ofthetotalworld﹣farmlandcover.ThehardworkofSirAlbertHowardtheFatherofOrganicFarminghaspaidoff. AdvantagesofOrganicFarming 1Theeconomicsoforganicfarmingarecharacterizedbyincreasingprofitsthroughreducedwateruseandreducedsoilerosion侵蚀. 2Organicfarmingproducesthesamecropsasthoseproducedthroughtraditionalfarmingmethodsbutuseshalftheenergyandholds40%moretopsoil 3Farmingtheorganicwayenablesfarmerstogetridofweedswithouttheuseofanychemicals. 4Theuseofgreenpesticides杀虫剂isenvironmentallyfriendlyanddoesnoharmtohuman'shealth. DisadvantagesofOrganicFarming 1Organicmethodsoffarmingproducelesscomparedtotraditionalfarmingtechniques. 2Organicagriculturedoeslittletofightglobalclimatechange.ThoughorganicfarmingpracticesarerecognizedasgivingoutlessCO2butnottoasignificantdegree. Howeverthoughtherearesomedisadvantagesoforganicfarmingfarmswhereorganicmethodsforcroppinghavebeenusedhavemoreadvantagesthantraditionalfarms.Organicagricultureissurelybetterinthelongterm. 1TheunderlinedsentenceinParagraph1showsthatSirAlbertHoward. A.workedhardfornothing B.succeededinorganicfarming C.spentallhistimeonorganicfarming D.didn'texpectorganicfarmingtobesuccessful 2Accordingtothepassagecomparedtotraditionalfarmingorganicfarming. a.ismoreenvironmentallyfriendly b.producesalotmorefood c.useslessenergy d.resultsinmoreweedsinthefarmland e.isbetterforhuman'shealth A.abc B.acd C.ace D.bce 3Theauthor'sattitudetowardsorganicfarmingis. A.anxious B.hopeless C.unclear D.optimistic 4Thewriterwrotethispassagetotellus A.thedevelopmentofagriculture B.whatkindoffoodisbeinggrownatpresent C.whyorganicfarmingissopopulararoundtheworld D.whatorganicfarmingisanditsadvantagesanddisadvantages
目前你校有许多学生因为各种原因很少参加体育锻炼假定你是张华请你就此事向你校英语报写一封信倡导同学们积极参与体育锻炼. 内容包括 1.学生们不参加体育活动的原因 2.进行体育活动的好处. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.文章开头和结尾语已给出不计入总词数. Dearschoolmates Nowadaysmoststudentsdon'tdosportsforkindsofreasons.
在平面直角坐标系中记曲线C为点P2cosθ﹣12sinθ+1的轨迹直线x﹣ty+2＝0与曲线C交于AB两点则|AB|的最小值为
TimeTravel Ifyoucouldtravelintimewherewouldyougo?PerhapsyouwouldwatchanoriginalperformanceofaShakespeare'splayinElizabethanEngland?WhatabouthangingoutwithLaoziintheSpringandAutumnPeriod?Ormaybeyou'dvoyagefaraheadofthepresentdaytoseewhatthefutureholds. Thepossibilityoftimetravelisindeedappealing.Storiesexploringthesubjecthavebeenaroundforhundredsofyears.Perhapsthebestknownexampleissciencefictionnovel.TheTimeMachinewhichwaswrittenbyH.G.Wellsandpublishedin1895forthefirsttime.Itwasadaptedintoatleasttwofeaturefilmsofthesamenameaswellastwotelevisionversionsandalargenumberofcomicbookadaptations.Itisgenerallycreditedwiththepopularizationoftheconceptoftimetravelusingavehiclethatallowsanoperatortotravelpurposefullyandselectively.ThetermtimemachinecoinedbyWellsisnowuniversallyusedtorefertoavehicletransportingpeopleintothefarfuture. Butcouldtimetravelactuallybepossible?Somescientistssayyesintheory.Theyproposeusingcracksintimeandspacecalledwormholeswhichcouldbeusedasshortcutstootherperiods.Einstein'stheoryofrelativityallowstimetravelinextremecircumstances.AndBritishphysicistStephenHawkingsaysyoucouldtravelintothefuturewithareallyfastspaceshipgoingatnearlythespeedoflight.Thoughbuildingsuchaspaceshipwouldofcoursebenosimpletask. Evenifyoucouldtravelintothepastthereissomethingcalledthegrandfatherparadox.Itaskswhatwouldhappenifatimetravelerweretogobackintimeandhavehisowngrandfatherkilledforsomereasonandthereforepreventhimselffrombeingborn.Ifthetimetravelerwasn'tbornhowwouldhetravelbackintime? Andwouldyoureallyliketovisitthefuture?InH.G.Wells'bookthemaincharactertravelsintodistanttimewherehearrivesatabeachandisattackedbygiantcrabs.Hethenvoyages30millionyearsintothefuturewheretheonlylivingthingisablackobjectwithtentacles触角. Ifthat'swhat'sinstoremaybewearebetterjustlivinginthepresentdayafterall. 1ThenovelTheTimeMachinementionedinParagraph2aimstoshow. A.thecontributionofH.G.Wells B.thestory'sdifferentfeatures C.thelonghistoryoftimetravel D.people'sinterestintimemachine 2Einstein'sandHawking'stheories. A.suggestthepossibilitytoinventthetimemachine B.pushtheinventionofthefirstspaceship C.haveprovedwrongbysometimetravelers D.havesimilaritiesinmanyway 3InParagraph4grandfatherparadoxprobablyreferstotheideathat. A.thetravelerispreventedfrommeetinghisgrandfather B.thegrandfather'sdeathmakesthetraveler'sbirthimpossible C.thetravelergoesbackintimetoseekforhisgrandfather D.thereunionofthetravelerandhisgrandfatherbringshappiness 4Accordingtothepassagewhatisprobablytheauthor'sattitudetowardstimetravel? A.Skeptical. B.Unclear. C.Supportive. D.Unconcerned.
假定你是李华是你校音乐节的组织者之一.请你用英语给美国笔友Mike写一封邮件请他介绍一下他们学校的音乐活动并对你校音乐的组织提出建议. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
GreatholidaysinEurope! Doyoulikethebeachbutwantabitmore? ThencomeonanActiveBeachholidayatoneofourcentersinGreeceTurkeyorCroatia.Allthecentersarenearbeautifulbeachesandalloffersailingwindsurfingorwaterskiingwithourexcellentinstructors.Forachangefromthewateryoucanalsobookashorttriptoanearbyvillageandvisitthecolorfulmarketsoreatinalocalrestaurant.Attheendofthedayrelaxinyourhotelroomordancethenightawayatoneofouropen﹣airclubs. WhowasKingArthur?Wheredidhelive? Joinusonafive﹣dayUKRoadTripholiday.ImaginelifehundredsofyearsagoaswevisitancientStonehengeRomanBathandTintagelCastlethehomeofKingArthur.Learnthehistoryoftheseinterestingplacesfromyourguideasyoutravelinoneofourfamousbluecoaches.Intheeveningswestopatsomeofthebestyouthhostelsinthecountry.Theyhaveeverythingyouneedyoudontevenneedtopackasleepingbag! Areyouboredwiththeusualholidays?Doyouwanttodosomethingyoureallyenjoy? ThenFameCampisforyou!SpendaweekatHightreeHouseinYorkshireandlearnhowtoplaythepianoviolinandguitar!Bringyourtentandstayatacampsitenearthehouse.Attheendoftheweektryyournewskillsinaliveperformance. Howmanycountriescanyouseein21days? OnourExploreEuropeholidayyoucanseeten!Learnaboutthemfromourbestguidesasyouwatchthemgopastfromthewindowofanair﹣conditionedcoachandstayatsomeofEurope'stopcampsitesontheway.Ofcoursewe'llalsohavetimetodotheimportantthingssuchasvisitingtheEiffelTowerinParisthehistoricSistineChapelinVaticanandeatingappleѕtrudеlіnVіеnna. Formoreinformationaboutanyoftheseholidayscall08453334523orvisitwww.comewithusuk.com. 1TouristswhogoonanActiveBeachholiday. A.candosomewatersports B.cancookbythemselves C.willenjoyanopen﹣airconcert D.shouldbringtheirownsleepingbags 2IfyouwanttoknowmoreaboutTintagelCastlewhichholidayshouldyoutake? A.FameCamp. B.ActiveBeach. C.UKRoadTrip. D.ExploreEurope. 3WhatcanwelearnaboutExploreEurope? A.Itlasts10days. B.Itisacoachtour. C.Itisaself﹣guidedtour. D.Itgoespast21countries.
已知函数y＝sinωxω＞0在0上有最大值没有最小值则ω的取值范围为．
若不等式组可表示为由直线围成的三角形区域包括边界则实数a的范围是
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