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设向量=(1,2),=(x,﹣1),且⊥,则(﹣)•(3+2)=( )
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高三下学期数学《》真题及答案
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设直线方程为则该直线
过点(-1,2,-3),方向向量为i+2j-3k
过点(-1,2,-3),方向向量为-i-2j+3k
过点(1,2,-3),方向向量为i-2j+3k
过点(1,-2,3),方向向量为-i-2j+3k
已知向量a=12b=2-2.1设c=4a+b求b·ca2若a+λb与a垂直求λ的值3求向量a在b方向
设向量a=12b=23若向量a+b与向量c=4-7共线则=________
设
={(x,y)|4x+y=6},
={(x,y)|3x+2y=7},则A.∩B.等于( ) A.{x=1,或y=2}B.{1,2}
{(1,2)}
(1,2)
设XY为相互独立的随机变量且X~N12Y服从参数λ=3的泊松分布则DXY=______.
设向量a=xx+1b=12且ab则x=.
设向量a=xx+1b=12且a⊥b则x=
设向量a=1+cosx1+sinxb=10c=12.1求证a-b⊥a-c2求|a|的最大值并求此时x
向量组β1=01-1Tβ2=x21Tβ3=y10T与向量组α1=12-3Tα2=301Tα3=96-
x=12,y=4
x=15,y=5
x=-12,y=-4
x=-15,y=-5
设向量a=12b=23若向量λa+b与向量c=-4-7共线则λ的值为
1
2
3
若直线l过点34且12是它的一个法向量则直线l的方程为.
2x+y-11=0
x+2y-11=0
x+2y=0
2x+y-1=0
设集合
={x|-3≤2x-1≤3},集合
为函数y=lg(x-1)的定义域,则A.∩B.= ( ) A.(1,2)B.[1,2]
[1,2)
(1,2]
设向量a=m1b=12且|a+b|2=|a|2+|b|2则m=
设A为三阶实对称矩阵A的秩为2且向量a1=-12-1Ta2=0-11T是线性方程组A-Ex=0
已知向量a=12b=x4且a·b=10则|a-b|=.
平面内给定三个向量a=32b=-12c=41.试回答下列问题1若a+kc∥2b-a求实数k的值2设向
设向量a=m1b=12且|a+b|2=|a|2+|b|2则m=.
设A为三阶实对称矩阵A的秩为2且向量a1=-12-1Ta2=0-11T是线性方程组A-Ex=0
设向量a=12b=x1当向量a+2b与2a-b平行时a・b等于
2
1
设3阶实对称矩阵A的特征值是12-1矩阵A的属于特征值1与2的特征向量分别是α1=23-1T与α2=
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Theideaofrobotrulersfriendsandlovershasbeenatopicofsciencefictionnovelsforyears. Butaccordingtoonemathematicalmodelofhowourbrainscreateconsciousnessemotionalmachineswillneverexist. Thisisbecausecomputerscan'thandleanyprocessthatcompletelyintegrates整合informationsotheycannotbeconsciousorfeeloneexpertsays. AmathematicalmodelforconsciousnessdevelopedbyGiulioTononiattheUniversityofWisconsin﹣Madisonsaysthattheabilitytointegrateinformationisakeyfeatureofconsciousness. Hebelievesthatintegratedinformationcan'tbebrokendownintosmallerpiecesinconsciousmindsbecausethebraincontextualizes将……融入背景information. Forexamplewhenweseearedcircleourbrainsdon'tseetheshapeasacolourlesscircleplusashapelesscolouredareaNewScientistreported.Insteadweseeitasawhole﹣aredcircleweunderstandthewiderpicture. It'seasyenoughformachinestoeditacollectionofindividualimages图象butmemoriesaremadeupofabankofintertwined相互交织的imagesandexperiencesandcannotbechangedinthesameway. Researchershaveusedmathematicstoshowthatcomputerscannothandlethecomplexprocessesneededtofitpiecesofinformationtogetherperfectly. Thereforeifconsciousnessisbasedontheintegrationoflotsofpiecesofinformationcomputerscan'tbeconsciousandcan'texperienceemotionslikehumans. ProfessorPhilMaguireoftheNationalUniversityofIrelandinMaynoothsaysthatconsciousnesscannotbecreatedinaphysicalmachineinlimitedtimeusinglimitedmemory. Itdoesn'tnecessarilymeanthatthereissomemagicgoingoninthebrainthatinvolvessomeforcesthatcan'tbeexplainedphysically.Itisjustsocomplexthatit'sbeyondourabilitiestochangeithesaid. Hisresearchmaymeanthatlonelyhumanswillnotfindlovewitharobottheyareunlikelytobemadetheirslaveseither. 1Whydoexpertsthinkemotionalmachineswon'texist? A.Machinescan'tsolveproblems. B.Machinescan'tintegrateinformation. C.Machinescan'thandleinformation. D.Machinescan'tcommunicatewithpeople. 2TheexamplementionedinParagraph6isusedtoshow. A.machinescannotfeel B.thebrainhasconsciousness C.machinescanrecognizeshapesandcolors D.thebraincancontextualizeinformation 3Itcanbelearnedfromthetextthat. A.theideaofrobotloverswon'tcometrue B.machinescaneditintertwinedimages C.robotscanfitpiecesofinformationtogetherperfectly D.computerscanexperienceemotionslikehumansoneday 4Whatwouldbethebesttitleforthetext? A.Howrobotswork B.Robotswillneverhavefeelings C.Willrobotsbecomepeople'sfriends? D.Whatwillrobotsbelikeinthefuture?
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同的增加删除或修改. 增加在缺词处加一个漏字符号Ʌ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. ThenewschoolyearisaroundcornersoIneedtobuysomethingtomychildrenandmyself.Thereforeyesterday'safternoonItookthemtoashoestoretobuyingsomenewshoes.Myyoungestkidswantedapairofsportsshoesandthusweboughtonepair.Myoldersonneededapairofcasualshoesforschool.andwewerefoundsomeonsale.Thefirstpairwhichhetriedonwasalittlesmall.soheputonotherpair.andtheyfittedhimperfectly.Mydaughterwantedbeautydressshoesandshegotsomehighheels.Imyselfboughtsomebootsbecausemyoldoneswerewearingout.
在“要致富先修路”的思想指导下近几年云南的交通有了快速的变化特别是“高铁网络”延伸到云南以后许多地区的经济和旅游发生了翻天覆地的变化高铁列车也成为人们外出旅行的重要交通工具.假期里小明和爸爸从昆明到某地去旅游从昆明到该地乘汽车行驶的路程约为800km高铁列车比汽车行驶的路程少50km高铁列车比汽车行驶的时间少5h.已知高铁列车的平均时速是汽车平均时速的2.5倍求高铁列车的平均时速.
Whenadisasterstrikeshumanitarianagencies人道主义机构likeTheWorldFoodProgrammeWFPneedinformationmorethananythingelse.Theyneedaclearpictureofthedamagetoroadsandbridgesforexampletobeabletotakequickaction. WFPhaspublishedapictureofdamagetotheepicenter震中oftheearthquakewhichstruckHaiti.Thepicturewhichhasbeenproducedintheformofasatellite﹣basedmapshowsgreatdamagetotheepicenterwhere90%ofthebuildingsweredestroyed.Inthemaponepixel像素standsforhalfameterofland.That'saverycloselookofhowthingsareontheground.Ithelpedrescueteamsalot. WFP'sEmergencyPreparednessandResponseBranchproducedaseriesofclearmapsshowingthedamageofHaiti.ThemapshavebeenproducedinpartnershipwitharesearchanddevelopmentinstitutecalledInformationTechnologyforHumanitarianAssistanceCooperationandActionITHACA.TheorganizationwassetupyearsagoespeciallytoworkwithWFPinbringingdevelopmentsofsatellitetechnologyintoitsresponsetodisasters.Justafewyearsagothiswouldhavemeanthavingtowaitforhelicopterstooverflyareasandforhumanbeingstophysicallyseethedamage.Thesatelliteswhichoperatearoundhighaboveourheadsareofgreathelp.Theyareabletoseethroughcloudswhichishelpfulwhenweatherconditionspreventtheuseofopticalinstruments光学仪器. NowbothWFPandITHACAhaveteamsworkingaroundtheclocktomakeuseofmorenewtechnologiestohelppeopleactivelydealwithnaturaldisasters.Deathsandinjuriesfromnaturaldisasterscanbereducedifthedisastercanbepredicted.Severaldisasterpredictiontechnologieshavebeendevelopedovertheyears.WearealsoworkinghardtoprovideamoreeffectiveinstrumenttopredictnaturaldisasterssaidRiccardoRoscellipresidentofITHACA. 1AccordingtoParagraph1whatdoesWFPextremelyneedafteradisaster? A.Doctorsandvolunteers. B.Medicalandfoodsupplies. C.Theinformationaboutthedamage. D.Thedetailsaboutthecausesofthedisaster. 2WhatdoestheauthormainlywanttoshowuswhenhementionstheHaitianearthquakeinParagraph2? A.Thesatellite﹣basedmapisuseful. B.Itwasaveryseriousearthquake. C.Itcausedmanyinjuriesanddeaths. D.Thepictureofthedamageisunclear. 3Whatistheuniqueadvantageofthesatellitescomparedwithopticalinstruments? A.Theycanbeusedasthesubstitutionofhelicopters. B.Theycanreducedeathsandinjuriesfromnaturaldisasters. C.Theycanbeoperatedaroundhighaboveourheads. D.Theycanseethroughcloudsinbadweatherconditions. 4WhatcanwelearnfromRiccardoRoscelli'swordsinthelastparagraph? A.Itisnoteasyforpeopletopredictnaturaldisasters. B.Naturaldisasterscancausemoreterribleconsequences. C.Theyaretryingtofindoutabetterdisasterpredictioninstrument. D.Theyhavestudieddisasterpredictiontechnologiesforyears.
已知实数xy满足约束条件则z=﹣2x+y的最小值为
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已知各项均为正数的等差数列{an}的公差为2等比数列{bn}的公比为﹣2则
假定你是校学生会__李华上周你校组织一个文化交流团到英国某高中进行文化交流现已回国.请你代表你校交流团给英国活动负责人David写一封信内容包括1.感谢对方的招待2.此行的体验和收获3.邀请对方暑假来中国体验中国文化.注意1.字数100左右开头结尾已为你写好不计入总词数2.可以适当增加细节以使行文连贯.DearDavidWehavebeenbackhomesafelyfromEngland.YoursLiHua
解不等式组.
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阅读材料求1+2+22+23+24+…+210的值. 解设S=1+2+22+23+24+…+210① 将等式两边同时乘2得2S=2+22+23+24+…+210+211② ②﹣①得2S﹣S=211﹣1即S=﹣1. 请你仿照此法计算 1求1+3+32+33+34+…+32019的值 2观察归纳上述过程并直接写出下列式子的结果a+aq+aq2+aq3+aq4+aq5+…aqn=并证明.
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已知集合A={x|x2﹣x﹣2>0}B={x|log2x≤2}则A∩B=
如图在四边形ABCD中AB∥CD∠ABC=∠ADCDE⊥AC垂足为E.DC=7连接BE. 1求证四边形ABCD是平行四边形 2若△ADE的面积为∠DAC=60°求四边形ABCD的周长.
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. MylittlebrotherandIwentshoppinginnewlyopenedsupermarketinourcitylastMonday.Wetastedalittledeliciouscheesebiscuitsandbuythreeboxesofcandies.SeenoneofmyfavouritechocolatecakesIquickenedmystepsthroughthecrowd.AfewminuteslateIcouldn'tfindmybrotherandgotanxious.Sincethereweresomanypeopleinthesupermarketsoitwasquitetoughformetofindher.Ihadtoaskasalesmanforsomeadvices.Itwasn'tlongafterthesalesmanfoundaloudspeakerandstartedtosearchformybrother.ThanksforthesalesmanImanagedtofindmybrotheratlast.
HalloweenComingOut Amanwasshotinthefaceduringabankrobbery.Thatwasthenewsaboutmefiveyearsago.FromthenonIneverlookedina1itevenscaredmyselfwhenseeingmydestroyedface.Ilivedinmyhousealonewithoutoutsidecontact.ButonenightIwasmakingan2.ItwasHalloween. Whatafittingnightformeto3!Ilongedforhumancontact.WhenmypumpkinlanternsmiledatoothywelcomeinmyfrontdoorIheardfootstepsandgiggling咯咯的笑aschildrencameclosetomyhouse. Trickortreattheycried. Myhandsstartedto4.Iopenedthedoorandgavethema5smilethroughmydamagedlipsbeneatharoughscarwheremynoseonce6. Doyouwantatrickordoyouwantatreat?Myvoicesoundedmorelikeaghost.The7expressiononthechildren'sfacessuggestedeverything. Treat!They8pickedacandyortwofrommybucketandrantothe9oftheirparents. Iclosedthedoorandpressedmybackagainstit.IfeltdizzybutI10it.Thenthebellrang.Trickortreat.a11voicecametome.IopenedthedoortofindasmallgirlwearingaShirleyTemplemask. HiShirley.Ispokequietlynotto12her.Aren'tyoubeautifultonight? ShestaredatherfeetandshookherheadNo. Yesyouare.You'reShirleyTemplethemostbeautifulgirlintheworld. Shelookedupatmeandpulledher13totheside.Seeingherdeformed变形的facemyheartmissedabeat. WellIthinkyouarebeautifuldarling.Isaidgently. Atthewordshereyesconnectedwithmine.Anuncertainhandreachedtowardmybucketandtookonepieceofcandy.Thankyou.Hervoicewasa14.Sheturnedandrantohermother.Inoddedmyheadtohermotherandgavethembotha15. Iclosedmydoorandturnedoffmygatelamp.My16lifebeganagain. ThenextmorningIheardmydoorbellring.Itriedtoignoreit17itrangagain.IwenttothedoorandcalledoutWho'sthere? It'sShirleyTempleandherMom. Iopenedthedoorinafew18andlooked.Itwasthewomanandherdaughterwithouthermask.BeforeIspokethemothersaidMygirlsaidshewantedtomeetyou.Iwatchedtearsstartto19inthemother'seyes.Thisisherfirsttimeoutsidewithouthermask. Ipulledthedooropenandthatwasalsothefirsttimeinfiveyearsformetoinvitesomeoneintomy20. 1A.mirror B.wallet C.pocket D.bank 2A.expectation B.appointment C.introduction D.exception 3A.act B.stay C.appear D.flee 4A.shake B.cross C.dance D.tap 5A.bitter B.friendly C.simple D.quiet 6A.lived B.sat C.breathed D.slept 7A.moved B.excited C.shocked D.puzzled 8A.easily B.politely C.sadly D.quickly 9A.security B.shadow C.defense D.sight 10A.finished B.promoted C.got D.did 11A.thin B.loud C.claim D.clear 12A.interrupt B.scare C.discourage D.cheat 13A.gloves B.hat C.mask D.glasses 14A.whistle B.whisper C.signal D.sigh 15A.glance B.wave C.hand D.surprise 16A.busy B.social C.meaningful D.lonely 17A.for B.so C.but D.or 18A.seconds B.efforts C.inches D.steps 19A.well B.dry C.freeze D.fix 20A.future B.story C.mind D.life.
DutchdesignerDaanRoosegaardehasspentmuchofhistimeseekingartisticsolutions解决方案tosolveourenvironmentalproblems.HispastprojectsincludeBioluminescent生物发光TreestolightstreetsaSmog﹣FreeTowertocleanBeijing'spollutedair.andGatesofLight.whichusestheheadlampsofpassingcarstolightupthe60floodgatesoftheAfsluitdijkamajordamintheNetherlands.Nowheishopingtousehisskillstosolveapressingglobalproblem﹣spacejunk! Scientistsguessthatthereareover500000bitsoflargerubbish.TodealwiththeproblemRoosegaardeintendstoachievehisgoalbyeducatingthepublicabouttheneedofthesituationandcomingupwithpossiblesolutions.Theplan.calledtheSpaceWasteLab.startedinOctober2018withalaser激光showintheNetherlands.TheuniqueoutdoorartworkofLEDsusedreal﹣timetrackinginformationtopointatpiecesofspacejunkfloatingataltitudesof200to20000kilometers.Theexperiencewasdesignedtomakethepublicknowmoreabouthowmuchspacejunkthereare. Tofindasolutionthedesignerhasbeenthinkingwithexperts.OneoftheprojectsbeingconsideredisShootingStarswhichattemptstoreintroducethetrashtotheatmosphereinacontrolledway.Uponreentry.thewastewouldburnintheatmospherelikeashootingstar.Roosegaardeenvisagesthatifsuccessful.burningspacetrashcouldsomedayreplacefireworksatlargepublicevents! InSeptember2018.theRemoveDEBRISsatellitesuccessfullysentanettocatchatargetwhileorbitingatanaltitudeofabout300kilometers190miles.Sometimethisyear.thecapsulewillsetfreeaharpoonthathasbeendesignedtoremovespacetrash.AttheendofitstaskRemoveDEBRISwillletgoasailtobringthesatelliteitself.and.hopefullysometrashbackintotheatmosphere.whereitwillburnup. 1WhatcanweinferaboutDaanRoosegaarde? A.Heistooaggressivetoputforwardgoodplans. B.Heiscreativeinsolvingenvironmentalproblems. C.Heisfondofspendingallofhistimeseekingartskills. D.Heissensitivetoartreflectedinenvironmentalprojects. 2WhywasalasershowheldinOctober2018? A.Toconfirmreal﹣timeinformationaboutspacetrash. B.ToshowthegreatbeautyofLEDtocommonpeople. C.Toraisepublicawarenessoftheamountofspacetrash. D.Toinspirepeopletoconsiderthesolutiontospacetrash. 3Whatdoestheunderlinedwordenvisageinparagraph3probablymean? A.Suspect. B.Demand. C.Advise. D.Imagine. 4Whatisthefunctionofasail? A.Bringingthesatellitetoatmospheretoburn. B.Keepingtrashtravelingalongitsownorbit. C.Takingthesatelliteawayfromatmosphere. D.Removingspacetrashoutofthecapsule.
AfewyearsagomywifeandItookatriptoCostaRica.Uponarrivalwe1acarandheadedouttoourfirstdestinationwhichwasafewhoursaway.Ihada2soIfiguredI'dbeingreatcondition.About20minutesintothedriveIfoundmyselfpractically3intheunmarkedstreetsanddirtyroads.Upset.IturnedtoSiriavirtual虚拟的assistantinmyphoneforhelp. Itypedthe4toourdestinationinmyphoneandinstantlySirihad5thebestroute路线togetthereandwewereonourway. Theonly6wasthatthingsdidn'talwaysgothewayIthoughttheywould.Withthestreetsnotbeingwell7Iwouldsometimesmissaturnandheadinthe8direction.LuckilySirinevergot9withme.AnytimeImissedaturnSiriwouldsimply10andsayRecalculatingroute.11route.AndwithinafewsecondsSiriwouldhaveanewroute12togetustoourdestination. SometimesthenewroutemeantIhadto13totherightturnandsometimesshefoundadifferentroutethattookmynewlocationinto14Eventuallywemadeittoourhotel15andenjoyedsomebeautifulsceneryalongtheway. Mostpeoplemakethe16ofthinkingthatsuccessandhappinesscomefromsomeonesettingagoalandthen17straighttowardsit.The18isthatthereisnostraightpathtosuccess.Thereisn'teventhe19path.Therearemanypathsthatcangetyoutoyourgoals.Youjusthavetobe20torecalculateyourroutewhenyoumissaturnorthereissomethinginyourway. 1A.produced B.repaired C.rented D.purchased 2A.car B.phone C.compass D.map 3A.absorbed B.lost C.experienced D.free 4A.address B.approach C.receipt D.schedule 5A.polished B.discovered C.opened D.managed 6A.fear B.difference C.sympathy D.problem 7A.marked B.paved C.arranged D.expanded 8A.illegal B.new C.wrong D.potential 9A.generous B.mad C.concerned D.cautious 10A.breakdown B.cutin C.getup D.goaway 11AAbandoning B.Cancelling C.Reaching D.Changing 12A.checked B.updated C.adjusted D.planned 13A.point B.lead C.return D.apply 14A.order B.direction C.account D.place 15A.safely B.frequently C.hungrily D.gradually 16A.mistake B.excuse C.accident D.trouble 17A.accumulating B.withdrawing C.marching D.fleeing 18A.answer B.truth C.condition D.privilege 19A.first B.suitable C.accurate D.only 20A.willing B.proud C.anxious D.ambitious
BeneaththewaterintheChina'sQiandaoLakeliesahiddentreasure.TheancientcityofShiChengalsoknownasLionCitylocatedintheprovinceofZhejianghasbeensubmergedunderwaterfor53years.ShiChengwasfoundedabout1300yearsagoinavalleysurroundedbytheFiveLionMountains.WhentheChinesegovernmentdecidedtheyneededanewhydroelectricpowerstation水力发电站adamandman﹣madelakewereconstructedandthecitywasleftatthebottomofthisnewbodyofwater.Nowitsitsatdepthsrangingfrom85feettoabout103feet. MuchliketheMachuPicchuruinsinPeruthisunderwatercityremainedforgottenuntilsomerenewedinterestsleadtoitsrediscovery.QiuFengalocalofficialinchargeoftourismthoughtaboututilizingShiChengforentertainmentonthelakeandasadestinationfordivingclubs.OnSeptember182001scubadiversmadetheirfirstattemptunderwater.Wewerelucky.AssoonaswedivedintothelakewefoundtheoutsidewallofthetownandevenpickedupabrickQiutoldGuangzhouDailyinaninterview.Moreresearchwasconductedanditwasdiscoveredthattheentiretownwasintactt881includingwoodenbeamsandstairs.Aftertheinitialfindingsinternationalarchaeologistsandafilmcrewthenrecordedthepreservationofthelostruins. Lookingatsurfaceofthelakedottedwithover1000islandsyou'dneverknowthatanentirecitywasbelow. It'sincredibletothinkthatafterallthistimethestructurestillremainsintactandwecouldonedayvisitit.UntilthenShiChengwillcontinuetoremaininconspicuouslysubmerged. 1WhywasShiChengcoveredbywateraccordingtothepassage? A.Becausethecityhasalonghistory. B.Becausethegovernmentcouldattractmoretouristsbydoingso. C.Becausethegovernmentneededtobuildapowerstationwhereitwas. D.Themountainssurroundingthecityledtotheconsequence. 2Whatdoestheunderlinedwordinitialmeaninparagraph2? A.Original B.Great C.Wonderful D.Amazing 3WhatisthemostunbelievablepartofShiChengaccordingtothepassage? A.IthassomethingtodowithMachuPicchuruinsinPeru. B.Noonewasinterestedinthelostcityforalongtime. C.Itsstructurekeepsperfectinthewaterforalongtime. D.Thereareover1000islandsprotectingthelostcity. 4Whowillmostprobablycometovisitthelostcity? A.Someonewholikesswimming. B.Someonewholikesdiving. C.Someonewholikesclimbingmountains. D.Someonewholikestakingpictures.
ThePalaceMuseumiscelebratingitsupcoming600thanniversary.Itsnewattempt1fillyoungergenerationswithcultureisafabulousmixofcelebritiesancienthistoryandmoderntechnology.ThePalaceMuseumishometo2rough1.86millionprecioushistoricalrelics遗迹andamong3theNorthSongDynastymasterpieceAlongtheRiverduringtheQingmingFestivalpaintedbyZhangZeduan4considertobeofgreatvalue.ThepaintinghassuchareputationofbeingChina'sMonaLisa5millionsofvisitorsareattractedtoenjoyit.The6originmasterpieceisstatic静态的anditseemsthatthegeneralpublicrarelyknows7thepaintingisattemptingtoconvey.Since2000thePalaceMuseum8cooperatewithtechnologycompaniestomakethesesilenthistoricalrelicscomealive.Thedigitalizedversionoftheworkcanbeshownonthegiantscreeninanexhibitionroom.Visitors9wearVRglasseswilltakeaboatandexploretheneighborhoodoftheBianRiver.Thankstomoderntechnologyalltheprecioushistoricalrelicswillbebrought10lifewiththeirobscure晦涩的wordseasiertounderstand.
ATennesseewomancelebratedherbirthdaywithabittersweetgiftfrombeyondthegrave﹣﹣flowersfromherfatherwhodiedfiveyearsago. MichaelWilliamSellerspre﹣paidforabouquetof1tobedeliveredtohisdaughterBaileyevery2untilsheturned21.AndonFridayBailey3thegiftherlastfromherdad. Mydad4whenIwas16fromcancerandbeforehediedhepre﹣paidflowerssoIcouldreceivethemeveryyearonmybirthdaytheshe.Thisismy21stbirthdayflowersandthe5. Baileysaidthespecialgiftmadebirthdays6.SincethatdayI'vehatedmybirthday7healwaysmadeitsospecialBaileysaidIwasespecially8my21stbecauseIknewitwouldbethelastyear. Baileysaidthisyear'sgiftandbirthdaycardwereespecially9.Ibrokedownshesaid.Thatletterwasvery10andsadallatthesametime. Thisismylastlovelettertoherfather11.Idonotwantyoutodropanother12formeforIamina13place.Healsotoldhertoalwaysrespecthermotherandstay14toherself.Behappyandlivelifetothefullesthewrote.Iwillbewithforeverjust15andIwillbe. Thatwasmydadshesaid.Hewastryingtomakemybirthday16. Socialmediausers17thepostcallingitbothheartwarmingandheartbreaking. Otherspraisedherfathercallinghimaan18ofwhatagoodmanislike Hewouldbevery19Baileysaidhe'dbeveryproudthatit20alotofpeople. 1A.flowers B.cakes C.presents D.grapes 2A.wedding B.birthday C.funeral D.exam 3A.sold B.cheated C.received D.threw 4A.passeddown B.passedout C.passedby D.passedaway 5A.first B.last C.best D.most 6A.tough B.happy C.natural D.honest 7A.because B.but C.so D.if 8A.liking B.expecting C.hating D.preparing 9A.expensive B.careful C.beautiful D.meaningful 10A.difficult B.sweet C.fortunate D.selfish 11A.smiled B.forgot C.wrote D.sighed 12A.coin B.hair C.tear D.leaf 13A.better B.hotter C.colder D.worse 14A.hard B.wealthy C.foolish D.true 15A.walkaround B.putforward C.lookaround D.giveup 16A.tiring B.amazing C.boring D.embarrassing 17A.respondedto B.ledto C.contributedto D.cameto 18A.joke B.story C.prize D.example 19Avivid B.proud C.nervous D.ashamed 20A.knocked B.fired C.informed D.touched
Helpfultipsforcollege﹣boundseniors Researchingacollegeisoneofthemosttime﹣consumingtasksthatyou'llencounter.1Forexamplewhatclassesandfacilitiesthecollegehastoofferandwhatsportsitoffers.Afternarrowingyourchoicestoagroupofcollegesyou'llhavetostarttoresearchtheseindepth.2Heorshemaybeabletohelpyoufindthingsaboutthecollegesthatyoucouldnotgetyourself. Knowingwhatyouwanttostudyisanotherkeytolookingforacollege.3ByknowingwhatIwanttodoIcanthenlookatcollegesthatI'vebeenthinkingaboutapplyingtoandnarrowmychoicesdown.Ifacollegedoesn'thavethecoursesIneedthenit'sdefinitelyoutofthepicture. Anotherkeythingtolookforisthecollege'stestingrequirements.4SomecollegesalsorequireanSATIItestincertainareasforexampleEnglishorMath.Remembertolookatacollege'sGPArequirementstoo.Youmayfindacollegewherethere'severythingyouwantbutyourGPAisn'thighenoughtobeconsidered.Inthiscaseyoumayneedtoattendajuniorcollegeforoneortwoyears. 5Atthispointyoumaywanttohavealongdiscussionwithyourparentsandfindouthowmuchthey'rewillingandabletospendoncollege.Ifitisn'tenoughtocoveryourfulltuitionthenyoumaywanttoapplyforfinancialaidorascholarship.Andyourfinaloptionmaybelookingforacollegethatdoesn'tcostasmuch. A.AllcollegesrequireanSAToranACTtest. B.Andlastlybutdefinitelynottheleastistuition. C.Lookforacollegenowifyouplanonattendingone. D.Youneedtofindoutmanybasicsaboutpossiblecolleges. E.Ifyouwillbeaseniorinthenearfuturethisarticleisforyou. F.Iplantomajorinbusinessmanagementandminorincomputerapplications. G.Ifyouhaveacollegecounseloratyourschoolthiswouldbeagoodtimetoaskforadvice.
ItwasdaysorevenweekssinceIhadbeenleftontheisland.MyonlycompanionwasadogcalledPhillywhichhadsurvivedtheshipwreck.Memoriesofwhathappenedwerestillfresh. Themagnificenceoftheshiphadgivenusallafalsesenseofsecurity.Asthefirstsignsofthestormstartedourcaptainannouncedit'snothingmuchjustanotherstorm.Yethewaswrong!Thestormhittheshipsobadlythatlargeholesweremadeatthesidesoftheship.Asthefreezingwaterstartedrushinginourshipwasconsumedquicklybythedarkwater. MytrainofthoughtwasdisturbedbyPhillylickingmyhanddearly.Areyouhungry?Ispokemyfirstwordseversincetheshipwreckoccurred.Woofwoof!BarkedPhillyenthusiastically.Atthismomentmystomachgavealoudgrowltoo.Icouldnotrememberwhenmylastmealwasprobablyaten﹣coursedinnerontheship.AsIhadneverfishedbeforeIthoughtmaybeIcouldtrysomethingsimplerlikepickingfruits.WithPhillyatmysidearmedwithasharpbranchwewalkedintotheforestontheislandtogether.SuddenlyIthoughtIheardnoises.Couldtherebeanyoneelseonthisisland?Iwondered.Aswewerelookingforfruittreeswechancedupononethatboreyellowjuicy﹣lookingfruit.Phillystartedbarking﹣wehadcompany.Itwasadark﹣skinnedwomanholdingasharpspeardressedinfurandgrass.Ibackedawayfromherafraidthatshewouldbeaggressive.ThenIsawthatshewastryingtosaveus.Pointingherspearatthefruittreesheshookherheadstrongly. InoddedathertoshowIunderstoodwhatshewassaying.SignalingtoustofollowhersheturnedtowalkalongasmallpaththatIhadnevernoticed.Attheendofthesmallpaththerewasasmallvillage.Tearsofjoyfilledmyeyes. 1Whathappenedtotheshipthewriterhadbeenon? A.Itwasfrozeninthesea. B.Itwasturnedoverbythestorm. C.Itwasdesertedbecauseitwasinsecure. D.Itsankduetothedamagecausedbythestorm. 2AccordingtothepassagewhichofthefollowingcanbestdescribePhilly? A.Activeandfriendly. B.Caringbutaggressive. C.Smartandfaithful. D.Noisybutenthusiastic. 3Whydidthewriterwalkintotheforest? A.Totakeshelterfromthestorm. B.Togotoasmallvillage. C.Tofindsomeoneforhelp. D.Tolookforsomethingtoeat. 4Thewomanmostprobablytriedtotellthewriterthat. A.thefruittreewasn'tthebestchoice B.thefruitwasunfitforeating C.thewriterwasn'tallowedtopickthefruit D.shewasn'tafraidofthewriter
如图AB是⊙O的直径且AB=6.点C是⊙O上的一动点连接ACBC在AC的延长线上取一点D使得∠CBD=∠DAB点G为DB的中点点E为BG的中点连接AE交BC于点F. 1试判断直线BD与⊙O的位置关系并说明理由 2当∠CGB=60°时求的长 3当AE∥CG时连接GF若AF=4求BD的长.
Screamifyouwanttochargeyourphone.ThankstothewondersofscienceridersonThorpePark'snewattractionarollercoaster过山车calledTheWalkingDeadcannowpowertheirsmartphonesbyscreamingloudly.That'sbecausetherearedevicesonitthat'harvestkineticenergy'动能.Theparkconductedresearchwhichshowsthatmillennials'biggestfearistheirphonesrunningoutofbatterysothedeviceshouldprovepopular.AlloftheWalkingDead'scarriageshavebeenfittedwiththeharvestingdeviceswhichnotonlyharvesttheenergyofscreamsbutthatfromg﹣forceandvibrations振动too.Theunitsarethenremovedfromthecarriagesbystaffanddepositedintoanon﹣sitemobilechargingpoint.ThorpeParksaid'Ifthrill﹣seekersarebraveenoughtoopentheireyestheywillseeasetofLEDlightsinbloodredpoweringupasguests'screamsbecomelouderthroughoutthespine﹣tingling90﹣secondexperience.'DesignedandinstalledbyresearchersatQueenMaryUniversityLondonandtheengineeringteamatThorpeParkResortthetechnologytookthreemonthstoimplement执行fromdesigntoinstallation.Itwillbeavailableatthethemeparkforaninitialtrialperiod.Ifthisprovessuccessfulthetechnologymaybecomeapermanentfixturefortheremainderofthe2018season.ThorpeParkResort'sJohnBurtonwhocameupwiththerideconceptsaid'TheWalkingDeadTheRideis15outof10onthescarefactorscale等级soitmakessensetobeabletocombineandusethepowerofourvisitors'screamsandtheride'svibrationstohelpsolveaproblemeachandeveryoneofusfaces﹣losingthechargeonourmobileswhenwe'reonadayout.'DrJoeBriscoeSchoolofEngineeringandMaterialsScienceatQueenMaryUniversityofLondonsaid'Thisisanexcitingconceptthatwillundoubtedlybeusedmorefrequentlyinthefuture.Thesystemusesaminienergyharvestertocapturethekineticenergytransferringittoaseparateelectricalcircuitandstorageunitwhichisenoughtochargeamobilephone.'1Wecanlearnfromthetextthat.A.aphoneshouldbeputintherollercoastertobechargedB.itwasJohnBurtonwhodesignedandinstalledthedeviceC.theenergyofscreamsg﹣forceandvibrationscanbeharvestedbythedeviceD.thetrialperiodofthetechnologywilllastthreemonths2Whatdoestheunderlinedword'spine﹣tingling'meaninParagraph4?A.Unforgettableandsatisfying.B.Interestingandinspiring.C.Exhaustingbutdelightful.D.Frighteningbutexciting.3WhatisDrJoeBriscoe'sattitudetowardthefutureofthenewconcept?A.Skeptical.B.Optimistic.C.Critical.D.Neutral.4What'sthemainideaofthetext?A.Thetraditionalwayofchargingyourphoneisonthewayout.B.Anewbatteryforpoweringyourphoneisinvented.C.Visitors'screaminThorpeParkcanbeusedtochargethephone.D.ThemosteffectivewayofchargingyourphonehasbeenfoundinThorpePark.
假定英语课上英语老师要求同桌之间互相修改作文请你修改你同桌的以下作文. 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. 删除把多余的词用斜线\划掉. 增加在缺词处加一个漏字符号∧并在该词下面写出该加的词. 修改在错的词下划一横线在该词下面写出修改后的词. 注意1每处错误及修改均仅限一词. 2只允许修改10处多者从11处起不计分. Dearfriends ItisagreathonortosharewithyoumyexperienceinmakingEnglishspeeches. TotellatruthmyspokenEnglishusedtobeabigheadacheforme.DuetomyterriblepronunciationIoftengotmisunderstoodorevenlaughedbyothers.Ineversucceedinspeechcompetitions.ThereforeIrefusedtogiveup.EverydayIspenttwohourslistentoEnglishprogramstoimprovemyoralskills.Tomyjoymyeffortwasfinallypaidoff.Imadesteadilyprogressandmanagedtowinprizesinsomespeechcompetition. Soproblemscanhelpusgrowifwedealwithitbravelyandproperly.ThisiswhichI'velearnedfrommyexperience.
WhyYouShouldn'tPunishYourKidsForLyingIt'snoeasytasktostopyourchildrenlying.TherearemanyinfluencesTVmoviesvideogamesandsomegreatbooksinwhichliesarecommon.Childrenseeparentslietoothersonlytobepolite.MostparentsaddtothatwithtalesaboutthelivesandactivitiesofSantaClausortheToothFairytobringjoyortolessenfears.1butforsomechildrenlyingcanbecomeaproblem.Themostcommonreactionstochildrenwholieareexplainingwhyitiswrongandpunishingthem.2.Herearethreebettertoolssupportedbyresearchtouseinstead.PRAISEYoucouldaskyourchildtosaysomethingthathappenedatschoolthatistrue.Whenyourchildobeyspraisehimenthusiastically.Bespecific'Thatwasgreat!YoutoldmewhathappenedjustasIasked.Wow!'andgiveyourchildahugorahighfive.Aimforoneortwointeractions互动likethisaday.Ifyouhappento'catch'yourchildinaliesaysomethinglike'Thatisnottrueandcouldgetyouintroubleoutsideofthehome.'MODEL3.Thiscouldbeaboutsomethingthathappenedwhenyouwereachildorsomethingthathappenedduringtheday.Itneednotbedramatic.Anotheroptionistoplayagameatdinner.Eachpersontellsonethingthatwastruethatday.Againgivealittlepraisetothechildwhonormallyliesifheplaysalong.DECREASEPUNISHMENTANDMORALIZINGSomechildrenareunlikelytochangebehaviorordeveloptheconductyouwant.Thatdoesnotmeanyoucanignoretheirlyingorletitgo.Ratheruseverymildpunishmentlightscoldingshortlossofprivilegeabrieftime﹣out.4.Trytheseproceduresfortwotothreeweeksandseewhereyouare.Usuallyliescanbedroppedbythen.5butwiththerightencouragementcanbedramaticallylessened.A.ParentspunishchildrenbecausetheyareinapositionofgreaterpowerB.ButaswaysofchangingbehaviortheseareineffectiveC.TheythinkitunnecessaryforchildrentotellalieD.ParentsdothisoutofloveE.SeverepunishmentsarenotalwayseffectiveinactuallychangingthefrequencyoflyingF.YoushouldsetagoodexampletoyourkidsandexplicitlytellthetruthG.Itisunlikelythatlyingwillbecompletelyremoved
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