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化合物F是合成一种天然茋类化合物的重要中间体，其合成路线如下： （1）A中含氧官能团的名称为 和 ． （2）A→B的反应类型为 ． （3）C→D的反应中有副产物X（分子式为C12...
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化合物F.是一种重要的有机合成中间体它的合成路线如下1化合物F.中含有氧官能团的名称是_______
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AntoinetteToniHarrisismakinghistory.onandoffthefield.The22﹣year﹣oldsophomore大二学生fromEastLosAngelesCollegehasbecomethefirstwomantobeofferedafullfootballscholarship. WhileafewwomenhavebeenofferedpartialscholarshipstosereaskickersoncollegiateteamsHarrisisthefirsttoreceiveafullscholarshiptoplayaskilledpositiononthefield.It'salandmarkforthesporttobesurebutforHarrisbreakingglassceilingsissomethingshe'sbeendoingsinceshewassix﹣years﹣old. IhadacoachwhohadtoldmebeforethatIwouldnevergettothenextlevelbecauseIwasalotsmallerandnotasfastastheotherguys.Sothatmomenttaughtmetonevergiveup.HarristellsCNN.FromthatmomentthenItoldmyselfnoone'severgoingtodecidewhatIamgoingtodowithmylife.That'smydecision. InsteadshewentontoplayforEastLosAngelesCollegehelpingherteamgo4﹣6afterbattlingbackfromhealthproblems. Duringlastmonth'sSuperBowlthedefensivebackappearedinaToyotacommercial.InitHarriscanbeseenputtinginworkonthefieldfacingopponents对手twicehersizeandliftingtiresintheair.It'saninspiringpartbutforHarristheattentionshe'sreceivingaftermakinghistoryisjustmoremotivationtoperformwellonthesport. Intheend.you'vegottopushyourselfHarristellsESPN.I'mgoingtofocusonmygoals.Myultimategoalistobeverygoodatafour﹣yearuniversityandthefirstfemaleNFLplayer.IknowIcangetthere. 1WhatmadeHarrisstandout? A.Sheplayswellasakickeronthefootballfield. B.Sheisthefirstwomantoreceiveafullfootballscholarship. C.Sheisoneoffewwomenplayersinhercollege. D.Sheworkswellasaskilledplayeronthefield. 2WhathappenedwhenacoachremarkedonHarris'development? A.Shelostheartforamoment. B.Shedeterminedtopractisemore. C.Shelackedthepowerofexercise. D.Sherealizedshedecidedonherfuture. 3WhatcanweinferfromtheToyotacommercial? A.Harrisgottreatedbadlybyopponents. B.Harriswasatadisadvantageinheight. C.Harrismusthavebeenawardedalot. D.Harris'motivationplayedakeyrole. 4WhatisHarris'aim? A.Playingconstantlyinheruniversity. B.Keepingupwithothersinheruniversity. C.BecomingthefirstwomanNFLplayer. D.WorkingasafemalecoachinNFL.
Astudyfoundwirelesssignalsareabletopassthroughbagsandsuitcasestojudgethesizesofdangerousmetalobjectsandidentifythem.Theseitemscouldincludeweaponschemicalslaptopsandbatteriesforbombs''theresearchteamsaidonTuesday. ResearchsuggestedthatWi﹣Ficannowbeusedtoestimatethevolumeofliquidssuchaswateracidalcoholandotherchemicalsforexplosivematerial.ThestudyledbyresearchersattheWirelessInformationNetworkLaboratoryWINLABintheSchoolofEngineeringshowedawirelessdevicewithtwotothreeantennas天线thatcouldbefittedinexistingWi﹣Finetworks. Thedetectionsystemanalyzeswhathappenswhenwirelesssignalsgothroughandbounceoffobjectsormaterials.Theapproachwhichthepaperstatesworksbyseparatingthewirelessinterference干扰causedbytwofactorsofobjects﹣thematerialandshape.Mostdangerousobjectssuchasweaponsareusuallymetalorliquidwhichhavesignificantinterferenceresearcherssaid. Whenitwastestedonabackpacktheaccuracyratetopped95percent.Buttheaccuracydroppedtoabout90percentwhenobjectsinsidebagsarewrapped.Andthetechcouldsavelivesifusedinmuseumsstadiumsthemeparksorschoolstheteamsaidnotingitsdesigncaninspectbagsorluggagewithoutbeinganexposuretoprivacy. ItuseschannelstateinformationCSIthatisreadilyavailableinlow﹣costWi﹣Fidevices.ThiscouldhaveagreatimpactonprotectingthepublicfromdangerousobjectssaidYingyingChenaco﹣authorofthestudyThere'sagrowingneedforthatnow.Inlargepublicareasit'shardtosetupexpensivescreeningequipmentlikewhat'sinairports.Manpowerisalwaysneededtocheckbagsandwewanttodevelopamethodtotrytoreducemanpower.'' Thepeer﹣reviewedstudywhichrecentlywonabestpaperawardatthe2018IEEEConferenceonCommunicationsandNetworkSecurityisnowpublishedonline.Futureworkwillcontinuetofocusonamelioratingtheaccuracyofidentifyingobjectsandimagingshapesandvolumes''researcherssaid. 1Whatdoesparagraph3talkabout? A.Thefunctionofthetechnique. B.Thewaythedeviceworks. C.Theprinciplethestudyisbasedon. D.Thebenefitofthestudyfindings. 2What'stheadvantageofthedevice? A.Itsavespeopleindangerofnaturaldisasters. B.Itpassesthroughbagswithoutdamagingthem. C.Itusesantennastopickupnetworks'signals. D.Itprotectspersonalinformationfrombeingdisturbed. 3WhydidtheresearchersstudythedeviceaccordingtoYingyingChen? A.Tosavemoneyandlabour. B.TomakefulluseofWi﹣Fi. C.Toprotectpassengers'privacy. D.Toresearchdangerousobjects. 4Whichofthefollowingcanreplacetheunderlinedwordamelioratinginthelastparagraph? A.Confirming. B.Improving. C.Discovering. D.Examining.
PigeonsinLondonhaveabadreputation．Somepeoplecallthemflyingrats．Andmanyblamethemforcausingpollutionwiththeirdroppings．Butnowthebirdsarebeingusedtofightanotherkindofpollutioninthiscityof8.5million． Theproblemforairpollutionisthatit'sbeenlargelyignoredasanissueforalongtimesaysAndreaLeewhoworksfortheLondon﹣basedenvironmentalorganizationClientEarth．Peopledon'trealizehowbaditisandhowitactuallyaffectstheirhealth．London'spoorairqualityislinkedtonearly10000earlydeathsayear．Leesaysciting引用areportreleasedbythecitymanagerlastyear．Ifpeoplewerebetterinformedaboutthepollutionthey'rebreathingshesaystheycouldpressurethegovernmenttodosomethingaboutit． NearbyonawindyhillinLondon'sRegent'sParkanexperimentisunderwaythatcouldhelp﹣thefirstweekofflightsbythePigeonAirPatrol．ItallbeganwhenPierreDuquesnoythedirectorforDigitasLBiamarketingfirmwonaLondonDesignFestivalcontestlastyeartoshowhowaworldproblemcouldbesolvedusingTwitter．DuquesnoyfromFrancechosetheproblemofairpollution． BasicallyIrealizedhowimportanttheproblemwashesays．ButalsoIrealizedthatmostofthepeoplearoundmedidn'tknowanythingaboutit．DuquesnoysayshewantstobettermeasurepollutionwhileatthesametimemakingtheresultsaccessibletothepublicthroughTwitter． SohewonderedhowcouldwegoacrossthecityquicklycollectingasmuchdataaspossibleDroneswerehisfirstthought．Butit'sillegaltoflythemoverLondon．ButpigeonscanflyaboveLondonrighthesays．Theylive﹣actuallytheyareLondonersaswell．SoyeahIthoughtaboutusingpigeonsequippedwithmobileapps．Andwecanusenotjuststreetpigeonsbutracingpigeonsbecausetheyflyprettyquicklyandprettylow． SoitmightbetimeforLondonerstohavemorerespectfortheirpigeons．Thebirdsmayjustbehelpingtoimprovethequalityofthecity'sair． 1WhatcanweinferaboutLondon'sairqualityfromParagraph2C A．Londonersareverysatisfiedwithit． B．Thegovernmentistryingtoimproveit． C．Londonersshouldpaymoreattentiontoit． D．Thegovernmenthasdonealottoimproveit． 2DuquesnoyattendedtheLondonDesignFestivaltoB． A．entertainLondoners． B．solveaworldproblem． C．designaproductforsale． D．protectanimalslikepigeons． 3WhydidDuquesnoygiveupusingdronestoflyacrossLondonC A．Becausetheyaretooexpensive． B．Becausetheyflytooquickly． C．Becausetheyareforbidden． D．Becausetheyflytoohigh． 4WhichcanbethebesttitleforthetextC A．CleanairinLondon． B．London'sdirtysecret． C．London'snewpollutionfighter． D．CausesofairpollutioninLondon．
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A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岀修改后的词. 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. LiXiaoismyclassmatewhoisveryhelpfully.Ifanyoneneedhelpsheisalwaysreadyandwillingtohelpthem.Althoughsheisusuallyveryquietbutshecanbequiteenthusiasticaboutsomethingswhenshewantstodothemgood.ForexamplewhenourschooldecidestostartarecyclingprogramforEarthDayLiXiaowasoneofthestudentorganizers.ShehelpedsetupbinstocollectrubbishesaroundtheschoolandspenttimeeverySundaymorninginthelocalparkcollectbottlestorecycle.Shewillmissherwhenshereturnshomeatendoftheterm.IhopetovisitingherinBeijingsomeday.
Ialwayshelpothersinstinctively本能地.NomatterhowbigorsmalltheactionIam1tohelpotherssuchasopeningdoorssharingumbrellaandsoon. Iwasdrivinghomeona6﹣lanehighway.Ahuge2involving5carsunfoldedinfrontofme.SubconsciouslyI3100feetpastthepile﹣upandrantoacarwhichwasupsidedown.Igottheinjuredoutofthecarand.4themagainsttheguardrail护栏.Ithenwenttothefourothercarstocheckifanyoneelsewashurt5. Ilookedoverandsawayoungmanbloodyandcontorted6stillonthepavement.Everyonearoundsaidhewasdeadseveralhadchecked.Butafeelinginsidemesaid1didn'tcheckhim.Cantheybe7heisdead?Ifeltforpulsesatdifferentspotsandfelt8.ThenIcheckedthecarotidartery颈动脉onceagain.AtthatmomentIwasfeelingforaveryweak9andrapidheartrate.Ipushedhischinupwards.Hethen10outabigclot血块andstartedtakingrapid11breaths. Bythentheambulancewasleavingwithother12.Ithadbeenreportedonradiothattherewasadeath.SowhenImotionedtotheambulancedriver13thispersonwasaliveandneededhelpfirst.Heinitially14myrequest.Butwithmyinsistencehetogetherwithanursedidinfact15themanthoughttobedead. HewasadmittedtoalocalICU.Hisinjurieswereseriouswithlittle16torecover.Someforetoldhewouldn't17it. Duetothedistinguisheddoctorsandcareofnurseshedid18.Whenhewasreleasedfromhospitalthestorywas19byallthenewsstations.IsmiledtomyselfhappythatIwasfortunateenoughtobeattherightplaceattherighttimetofollowmy20anddidabigdeal. 1A.driven B.persuaded C.ordered D.convinced 2A.trunk B.accident C.case D.truck 3A.wentover B.tookover C.gotover D.pulledover 4A.put B.leaned C.stood D.sat 5A.slightly B.hardly C.badly D.casually 6A.dying B.lying C.hiding D.crying 7A.certain B.skeptical C.puzzled D.eager 8A.something B.everything C.nothing D.anything 9A.voice B.breath C.pulse D.move 10A.spat B.spoke C.threw D.coughed 11A.strong B.deep C.narrow D.shallow 12A.victims B.passengers C.nurses D.drivers 13A.proving B.indicating C.pretending D.imagining 14A.criticized B.accepted C.understood D.ignored 15A.lookinto B.takeover C.attendto D.yellat 16A.time B.chance C.strength D.energy 17A.get B.make C.have D.put 18A.succeed B.appear C.survive D.escape 19A.covered B.invited C.praised D.interviewed 20A.instinct B.dream C.ambition D.hobby
在直角坐标系xOy中曲线C1的参数方程为α为参数将曲线C1上各点的横坐标都缩短为原来的倍纵坐标坐标都伸长为原来的倍得到曲线C2在极坐标系与直角坐标系xOy取相同的长度单位且以原点O为极点以x轴非负半轴为极轴中直线l的极坐标方程为． 1求直线l和曲线C2的直角坐标方程 2设点Q是曲线C2上的一个动点求它到直线l的距离的最大值．
TwoyearsagosomethinghappenedthatchangedmeandchangedhowIlivedinmyneighborhood．IntwodaysIlostallofthethingsthatwerevery1Ctome．Myjobasaseniorwriterforanationalmagazinecametoan2AandarelationshipwithamanthatIlovedended3B．Suddenlyeverythinghadchanged．My4DsankandIfeltaterriblesadness．Iwonderedhowor5AIwouldbeableto6Bmyselfout．ThelossesI7Cmademeloseconfidenceandmademedelicate8CasaresultIbegantoconnectmore9Bwithmyneighborsandtheworldaroundme．IlearnedthatthewomanfromElSalvadorhad10Afromhercountrywithtwoyoungdaughtersafterherhusbandhadbeenmurdered．Shecleanedhousestomakeends11Dandsendherdaughterstocollege．Ilearnedthat12DmyneighborscametoLosAngeles15yearsagotheydidnot13BEnglishandthefathercleanedoffices14A﹩8anhour．Laterhedrovedeliverytrucks．TodayheownsthreeapartmentbuildingsandhasmademoremoneythanI15Ceverwillinmylifetime． Nowmanyofmyneighborsaremy16B．AtChristmasIgivethemredwineandcakeand17Ctheygivemepottedflowers．Whenmycarwouldn'tstartafewmonthsago．anditlookedlikeitwouldhavetobetowed拖走awayanother18DfromGuatemalaasweetmannamedAngelquickly19Douthistoolsandgotthecar20A．Idiscoverhowextraordinarytheyare．Theywerehard﹣workinghonorablepeoplewholikemearejustlookingforwardtolivingwellandexperiencingsomehappiness． 1A．worthless B．attractive C．important D．pleasant 2A．end B．beginning C．conclusion D．crossing 3A．badly B．sadly C．successfully D．happily 4A．mind B．temper C．confidence D．heart 5A．if B．that C．which D．what 6A．turn B．pull C．take D．set 7A．accepted B．gained C．experienced D．experimented 8A．and B．or C．but D．so 9A．perfectly B．fully C．luckily D．kindly 10A．escaped B．flew C．left D．avoided 11A．see B．join C．get D．meet 12A．before B．while C．unless D．when 13A．say B．speak C．tell D．practice 14A．for B．in C．on D．about 15A．simply B．easily C．probably D．specially 16A．relatives B．friends C．guests D．hosts 17A．inturn B．inorder C．inreturn D．ingeneral 18A．friend B．visitor C．passer﹣by D．neighbor 19A．pointed B．handed C．stood D．brought 20A．started B．changed C．checked D．examined
已知集合A＝{x|0≤x≤2}B＝{x|x2＜9x∈Z}则A∩B等于
已知直线l为函数y＝ex图象的切线若l与函数y＝﹣x2的图象相切于点m﹣m2则实数m必定满足
StockingupforWinter?saidthecashierwithasmile.Shewaslookingatmyshopping1whichwasfullofcakesandbigboxesofcereal谷物食品.Iknewthatthe2wascoming.AlittleearlierIhadsteppedintothelocalfood3toseeiftherewasanysmallthingthatImight4.Theshelvesheldcannedvegetablescannedfishboxesofcheeseandmanyotherthings.Theywere5ofbreakfastfoodsthough.SoI6IwouldgivewhatIcould.I7intoalocalstoreandstartedtofillmycart.Iremembered8themallforbreakfastwhenIwashungry.IhopedwhatIboughtmight9afewhungrylittlestomachstoday. I10backatthecashierandsaidIt'sforthefoodcupboard.I11triedtogetoutofthestorewithout12itbecauseananonymous匿名的actof13isthebestkind.Ididn'twantany14orpraiseforwhatIdid.IhadneededtousethefoodcupboardsmyselfwhenIwasanunemployedand15youngfatherwithafamilytofeed.Anditfeltsorighttocompletethiscircleofloveand16toothersinneed.IknewtoothatIwasdoingwhatshouldbedoneandthatistheonly17anyofuseverneeds. Lovefillsthe18.Itisineveryhumanheart.Itisineveryactofkindnessnomatterhow19.Itisagloriouspictureofwhichweallarea20.Itissobigthatitisbeyondcomprehension. 1A.bag B.1ist C.cart D.center 2A.question B.cashier C.message D.request 3A.station B.cupboard C.company D.sale 4A.test B.change C.blame D.contribute 5A.short B.tired C.ashamed D.certain 6A.worried B.thought C.stressed D.warned 7A.drove B.broke C.walked D.slipped 8A.cooking B.adding C.weighing D.loving 9A.feed B.raise C.shake D.check 10A.asked B.smiled C.spoke D.questioned 11A.seldom B.mostly C.particularly D.usually 12A.missing B.troubling C.leaving D.mentioning 13A.kindness B.choice C.faith D.braveness 14A.guilt B.recognition C.pain D.interest 15A.admiring B.striking C.caring D.struggling 16A.moveback B.runout C.giveback D.holdon 17A.reward B.gift C.demand D.memory 18A.woods B.universe C.relief D.family 19A.similar B.hard C.small D.far 20A.record B.custom C.pleasure D.part
一个长方体被一个平面截去一部分后所剩几何体的三视图如图所示则该几何体的体积为
下面是一段短文请你对其进行修改．文中共有10处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词符号∧并在此符号下面写出该加的词． 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． It'struethateveryonewanttobeingoodhealth．I'mverygladtogiveyousomeadvicesonhowtokeephealthy． Firstofallweneedtokeepahealthyandbalancediet．Variouskindsoffoodcanprovideusfordifferentnutrientswhichourbodyneeds．Secondlyweshouldalsotakeexerciseregular．Asthesayinggoeslifeliesofmovement．Thirdlyweoughttogetenoughrestandsleep．HaveyouhearthatearlytobedandearlytorisemakesamanhealthywealthyandwiseLastbutnotleastwe'dbettertokeepahealthymind．Thatistosayweshouldlookateverythinginapositiveway．Don'tforgettolaughmuchandcryless．Youknowlaughterisbestmedicine．
KingEvanwassoconsciousaboutkeepinghispeoplehappyandconsideredthemashisownfamily.Hetookgreatcareto1hispeople'sneedsandtheylivedhappily. HoweverKingEvanusedtohearhiscourt宫廷mensaythatpeopleinhiskingdomalways2himforvariousreasons.Onedayhesecretlytookatriparoundhislandtofindoutwhatmadehiscountrymenfeel3.Howeverhecouldnotseeanyunhappypeopleandthisgavehimgreat4. Hedecidedto5ahugeboulder巨石inthemiddleoftheroadtotestthepeoplewhopassedby.6hissoldiershadplacedahugeboulderintheroadtheyallhidinanearbyplaceto7whatwouldhappennext. Theboulderalmostcoveredhalfoftheroadandmanywealthypeoplesimplywalkedaroundtheboulder. Nobodyreallyseemedtocareabouttheboulder8themovementsofvehicles. Theking'scourtmenalsosawtheboulderbutdid9tomoveitaway.Insteadtheybad﹣mouthedthe10fornotmaintainingtheroadproperly.Thesewerethepeoplewhomtheking11tobeloyal!Thekingwasshockedto12theirwords. Afruitsellerwalkedalongtheroadwithhisfruit.Whenhesawthehugeboulderhe13andtriedtomovethestone.Aftersome14thefruitsellerremovedtheobstacle障碍物fromtheroad15. Hesawahugebagplacedundertheboulder.Hepickedupandwasextremely16.ThebaghadanoteonitsayingHereisa17foryou!Thebaghas1000goldcoinsinsideandtheyarefortheonewho18thisobstacle! Thefruitsellerwassohappyandhewasalso19bythekingtoapartywherehewasrewardednicely.Everyobstaclewefaceinourlifeisan20! 1A.satisfy B.express C.record D.understand 2A.remembered B.thanked C.blamed D.forgave 3A.excited B.respected C.bored D.displeased 4A.advice B.relief C.power D.pressure 5A.fix B.hang C.hide D.place 6A.Before B.Since C.After D.Unless 7A.consider B.guess C.watch D.ask 8A.disturbing B.controlling C.directing D.changing 9A.something B.nothing C.everything D.anything 10A.king B.soldiers C.official D.passers﹣by 11A.knew B.proved C.announced D.believed 12A.repeat B.hear C.write D.read 13A.left B.smiled C.stopped D.returned 14A.attempts B.tests C.research D.discussion 15A.easily B.naturally C.hopefully D.successfully 16A.nervous B.surprised C.angry D.frightened 17A.task B.gift C.list D.joke 18A.notices B.breaks C.removes D.covers 19A.challenged B.forced C.sent D.invited 20A.opportunity B.concern C.message D.possibility
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. LastweekwhenIgottohomeafterschoolnoonewasathome.Iwenttomyparents'bedroomandfindawalletonthedesk.Ifeltveryexcitingbutscared.ThereasonwaswhetherIwantedtobuyadressbutIwasafraidofbeingathief.FinallyItookawayasmallamountofmoneytoavoidbenoticed.Nextdaywhendinnersbeganmymothersaidshemustbeoldenoughtoforgetabouthowtogetmoneylosing.Iknewthetruthandfeltshamefully.Idecidedtoputthemoneyinthecornerandletmymotherfindthem.Iwouldn'tmakesamemistakeagain.
Solarenergysystems&powerplantsdonotproduceairpollutionwaterpollutionorgreenhousegases.Usingsolarenergycanhaveapositiveindirecteffectontheenvironmentwhensolarenergyreplacesorreducestheuseofotherenergysourcesthathavelargereffectsontheenvironment. Howeversomepoisonousmaterialsandchemicalsareusedtomakethephotovoltaic光电池的cellsthatconvertsunlightintoelectricity.Somesolarthermal保热的systemsusepotentiallyhazardousliquidstotransferheat.Leaksofthesematerialscouldbeharmfultotheenvironment.U.S.environmentallawsregulatetheuseandsettlementofthesetypesofmaterials. Aswithanytypeofpowerplantlargesolarpowerplantscanaffecttheenvironmentneartheirlocations.Theplacementofthepowerplantmayhavelong﹣termeffectsonthehabitatsofnativeplantsandanimals.Somesolarpowerplantsmayrequirewaterforcleaningsolarcollectorsandconcentratorsorforcoolingturbinegenerators.Usinglargevolumesofgroundwaterorsurfacewaterinsomedrylocationsmayaffecttheecosystemsthatdependonthesewaterresources.Inadditionthebeamofconcentratedsunlightasolarpowertowercreatescankillbirdsandinsectsthatflyintothebeam. Theamountofsolarenergythattheearthreceiveseachdayismanytimesgreaterthanthetotalamountofallenergythatpeopleconsumeeachday.Howeveronthesuraceoftheearthsolarenergyisavariableandirregularenergysource. Theamountofsunlightandtheintensityofsunlightvariesbytimeofdayandlocation.Weatherandclimateconditionsaffecttheavailabilityofsunlightdailyandonaseasonalbasis.ThetypeandsizeofasoIarenergycollectionandconversionsystemdetermineshowmuchoftheavailablesolarenergywecanconvertintousefulenergy. 1Whichofthefollowingbestexplainshazardousunderlinedinparagraph2? A.inexpensive B.dangerous C.ineffective D.abnormal 2Whatinfluencecanlargesolarpowerplantshaveonthelocations? A.Pollutingthegroundwater. B.Protectingthehabitatsofplantsandanimals. C.Damagingthelocalnaturalbalance. D.Attractingbirdsandinsectstothearea. 3Whatdoesthelastparagraphmainlytellus? A.Differentareasreceivedifferentamountofsolarenergy. B.Howtoconvertsolarenergyintousefulenergy. C.Therelationshipbetweensolarenergycollectionandthesunlight. D.Somefactorsthatinfluencetheamountofsolarenergycollection.
ThebusscreamedtoastopinNazarethIsrael.FiveAustralianbackpackersboardedandstruckupaconversationwithme.Theyaskedtypicaltravelers'questions﹣wherewasIgoingandwhywasItravelingalone?MyplanwastotravelwithafriendofafriendIexplainedbutwhenIcalledherthatmorningshedidn'tpickupandIhadnootherwaytoreachher.MystomachwasinknotsbutIdecidedtoheadoutanywaythinkingImightrunintoherifItraveledtoTiberiuswherewehadplannedtogotogether. Whydon'tyoutravelwithus?oneofthebackpackersoffered.Theywereexperiencedadventurerswhowouldworkforafewmonthssavethentravelforaslongastheycould.TheircurrentplanwastoexploretheMiddleEastandEuropeinthreemonthswhileworkinginLondon. Itseemedriskytotravelwithstrangersbutmyinstinctsaidyes.ForthenexttwoweeksIexploredIsraelwiththebackpackersandlearnedtotrustmyinstinctsinalltypesofnewandinterestingsituations.WhentheyhookarideItookthebusbutwhentheywantedtostealintotheKingDavidHotel'sswimmingpoolIledtheway.TheworldopeneduptomebecauseIchosetotravelalone.Ijoinedcompletestrangerswhobecomeclosefriends.YearslateronecouplefromthebackpackinggroupevenflewfromSydneytoPhoenixtobeinmywedding. Thetripwassuchaspecialexperiencethatitgavemeconfidenceinallareasofmylife.SincethenI'vebackpackedaloneacrossSouthAfricasky﹣divedfrom12000feetinNewZealandandevenmovedacrosstheU.S.withnojoblinedup. OnmythirddaywanderinginIsraelwithmynewfriendsIbumpedintothewomanIwassupposedtomeet. ThoughIwashappyshewasallrightIwasgratefulshehadn'tpickedupthephone. 1ByMystomachwasinknotsinparagraph1theauthormostlikelymeansthatshewas. A.sickofridingonabumpybus B.nervousofmeetingstrangers C.upsetaboutthesuddenchange D.sorryabouttheimpracticalplan 2Whichofthefollowingbestdescribesthebackpackerstheauthormet? A.Courageousbutdisrespectful. B.Joblessandpoorlyeducated. C.Warmheartedandtrustworthy. D.Homelessbutlighthearted. 3Theauthor'ssixthsensetoldherthat. A.shewouldgetalongwiththebackpackers B.itmightcausetroubletohaveaswim C.sheoughttostayawayfromthebackpackers D.itcouldaddexcitementtogetafreeride 4Whatcanbeinferredfromthepassage? A.Mostofthebackpackersbecametheauthor'slifelongfriends. B.Theauthorgatheredthecouragetobeafulltimebackpacktraveler. C.Thewomanmissedthephonecallwiththepurposeoftravelingalone. D.Theauthorconsidereditthebestdecisionofherlifetotravelonherown.
Icomefromasmallruralareawherecollegeeducationisveryimportanttomakeagoodliving.Iamconsideringgainingagood1andajobIabsolutelylove.Myparentsweren'tso2tohavesuchanopportunity.Mydaddroppedoutofschoolduringhissenioryeartodrivetruckandmoveoutonhisown. AsahighschoolstudentIknowIcanbeverysmartifI3myselfsoI'vestudiedalotofcourses.Iplantoattendcollegeoneofthe4I'mfacedwith.Thoughwearen'twealthyandcollegecanbevery5Iintendtogetagoodeducationsomy6canhaveabetterlife.Knowingcollegeisveryhardto7pushesmetodomybest.LuckilyColoradoStateUniversityCSUcanofferalotandwill8myplan. My9hasalwaysbeentodowellinmylifeandgivemyfamilyabetter10oflife.ThelifeIliveisn'tbadbutIwanttotrytomakea11.Mylifeis12ofupsanddownsbutIalwayskeepmyheadhighandmakethebestoutofevery13IfirstunderstooditwhenIstartedrealizingmyparents14financiallyforwhatwereallyneeded.Nowadaysitgets15tosupportalivinginthiseconomicdepression.SeeingthisIwanttomakeachangeandgetagoodjobthatIwill16fortherestofmylife. I17togotoCSUandmajorinbiomedicine.Icangetdistractedeasilybut18thisshouldn'tbeaproblemaslongasIkeepmygoalsinsight.Ihavedeterminedtodowellincollegeand19inlife.CSUwouldbean20opportunitywithagreatenvironmentanditwouldbeanhonortobeastudentthere. 1A.present B.harvest C.education D.explanation 2A.smart B.relieved C.qualified D.fortunate 3A.push B.enjoy C.persuade D.inform 4A.demands B.choices C.challenges D.opportunities 5A.interesting B.large C.attractive D.expensive 6A.friend B.family C.classmate D.partner 7A.attend B.visit C.imagine D.complete 8A.findout B.fitinto C.agreeto D.resultin 9A.goal B.need C.condition D.schedule 10A.way B.imagination C.reward D.understanding 11A.reservation B.difference C.preparation D.decision 12A.free B.aware C.worthy D.full 13A.involvement B.response C.situation D.ambition 14A.desired B.struggled C.improved D.searched 15A.simpler B.funnier C.braver D.tougher 16A.affect B.love C.accomplish D.compare 17A.plan B.agree C.refuse D.remember 18A.gaining B.forming C.overcoming D.reserving 19A.exist B.appear C.operate D.succeed 20A.different B.temporary C.awesome D.separate
Ithoughtweallknewwhyindependentschoolstudentsdobetterthanthoseinthestatesector公立学校．Theyhavemoremoneymorefundingandbetterresourcesandtheydon'thavethemorechallengingstudentswegetinthestatesector． ThatwasbeforeIbecameateacher﹣researcherinatwo﹣yearprojectledbymycollegeaimingtofindthebestwaytosupporthigh﹣abilitystudents．WithfundingfromtheLondonSchoolsExcellenceFundweteamedupwithsomeofthecountry'stopprivateschoolslikeEtonandStPaul'saswellasanumberofstateschoolstofindouthowtobringtheknowledge﹣richlearningthatcharacterizesindependentschoolsintothestatesector． BeforetheprojectIhadn'thadmuchcontactwithpeoplewhohadbeeneducatedthere．ButthefirstthingIfoundwhenIvisitedwasthatteachersarethesame．Intheindependentsectortheyhavechallengestoo﹣justdifferentones． Aftertwoyearsourresearchprojecthasproducedahugesetoffindings． Oneofthemostusefulfindingswastheimportanceofindependentlearninghabitsoutsidetheclassroom．IrealizedthatalthoughIwasalwaystellingstudentsthattheyneededtodofourtofivehoursofprivatestudyaweektheydidn'thaveaclearideaofwhatthiscouldlooklikebeyondmakingnotes．SoIsetthemdifferentactivitiesincludingreadingarticlesdoingactivitiesandcompletingexaminationquestions． Istartedtoputmuchmoreemphasisonactivitiesoutsidetheclassroomlikeresearchingtopicsbeyondthesyllabus教学大纲ordiscussingthingsinthenews．AndIpraisedanyonewhoaskedquestionsinclasssowecreatedaculturewherestudentswereproudtoaskaquestionratherthanseeingitasawayofflaggingupthefactthattheyhadn'tunderstoodsomething． Myresearchisbeginningtohavearealinfluence．Mystudentsnowcometoclassandtellmewhattheywanttoknowabout．Buttheynolongerexpectmetodotheresearch﹣theywanttofindoutforthemselves．AttheendoftheyearIgavestudentsaquestionnaireonindependentlearning．OnewroteIndependentlearningwouldlimitthehelpIgotfromotherstudents．Ithelpsyoutothinkforyourself． 1WhatdidtheauthorsayaboutindependentschoolstudentsbeforeherresearchB A．Theyweretroublemakers． B．Theyenjoyedexcellentlearningconditions． C．Theyperformedworsethanstateschoolstudents． D．Theyfacedthesamechallengesasstateschoolstudents． 2WhydidtheauthorjointheprojectA A．Tointroducegoodlearningmethodstostateschools． B．Toexchangeteachingideaswithotherteachers． C．Topartnerwithotherschoolsineducation． D．Tofindenoughfundsforstateschools． 3WhatchangesdidtheauthormakeinherclassesC A．Shefocusedongrouplearning． B．Sheworkedoutadifferentsyllabus． C．Sheencouragedindependentlearning． D．Shecarriedoutvariousactivitiesinclass． 4Howistheauthor'sresearchgoingA A．Ithasmadeabigdifference． B．Ithasfailedtomakeprogress． C．Itisquestionedbyherstudents． D．Itinvolvesmanymorestudents．
把2支相同的晨光签字笔3支相同英雄钢笔全部分给4名优秀学生每名学生至少1支则不同的分法有
OodiHelsinki'snewCentralLibraryisintendedasanode颂歌toknowledgeandlearning. Manyforeignvisitorswhocomehereforthefirsttimeareverysurprisedthatthelibrarydoesnothaveaverylargebookcollectionbutfeatureswhatpeoplenowadaysoftenuselikedigitaldevicesstudiosformusicandvideoproductionacinemaandworkshopscontaining3﹣Dprintersandlasercuttersandallarefreetocustomers. OodigivesanewmodernideaofwhatitmeanstobealibrarysaidTommiLaitioHelsinki'sdirectorofcultureandleisure.It'sahouseofliteraturebutalsoahouseoftechnologyahouseofmusicahouseofcinema.AndIthinkallofthesecometogethertothisideaofhopeandprogress. Onesignofsuchprogressisthebuilding'sfleetofbook﹣carryingrobots﹣smallgraywagonswhichnavigate导航themselvesinandoutofliftsavoidingpeopleandfurnitureinordertobringreturnedbooksupfromthebasementanddropthemoffatthecorrectbookcase. Thelibraryisahugeflowingstructureofwoodandglasssittinginthecitycenter.Itisorganizedinthreedifferentlevels.Thegroundflooristheextensionofthesquareinfrontofthebuildingandit'slikeanindoorversionofthesquare.Themiddleoneconsistsofdifferentareaforpeopletointeractandalsodoworkalone.Thetraditionalquietlibraryatmospherecanbefoundonthetopfloor.ThisisacalmareafloatingabovethebusycentralHelsinki.Hereyoucanhaveagoodviewofthecity. ThisisthelibrarythatpeopleinHelsinkiwant.Everydaypeopleofallagegroupsdoverydifferentthingsonthethreefloorsandaregettingalongverywellwitheachother.Oodiisjustlikethelivingroomforthecitizens. 1WhatcanweinferfromwhatTommiLaitiosaid? A.HethoughthighlyofOodi. B.Oodivaluestechnologymorethanculture. C.HewasonceinchargeoftheconstructionofOodi. D.FuturelibrariesaretofollowtheexampleofOodi. 2Howarereturnedbooksarranged? A.Usingrobotstotransport. B.Puttingthemonthefurniture. C.Storingtheminthebasement. D.Arrangingthematthebookcase. 3Whereshouldyoustayifyouhopetoreadattentively? A.Onthegroundfloor. B.Onthemiddlefloor. C.Onthetopfloor. D.Onthefloatingwood. 4Whatisthebestsuitabletitleforthetext? A.OodiaNewKindofLibrary B.OodiaGoodPlaceforLearners C.ReadinginOodiisPopular D.OodiMakesHelsinkiFamous
Ibelieveinthepowerofsciencefictionnotjustforitscapacitytotransformdreamsintorealitybutalsoforitspowertobondtogetherthosewhoshareacommonvisionofthefuture.Formethat'strueformyrelationshipwithmydad.SomefathersandsonsbondoversportsfishingorhuntingbutmydadandIbondoverStarTrek.WetriedatriptoDisneyWorldbutoneofmyearliestmemorieswasn'tMickeybutaKlingonbattlecruiser巡洋舰onthescreen. Overtheyearsnearlyeverysettingandsituationhasbecomefarawayformydadandme.Whenit'swarmatnightwe'renotdrivingalongsomedarkstreetsinIndianabutgoingataslowspeedwithstarsdimlyshining.Bothofusarethinkingofthemwithoutneedingtosayaword.Allthesevisionsofotheruniverseshavetogethercreatedaprivateuniverseformydadandme. GeneRodenberrycreatorofStarTrekoncesaidSciencefictionisawayofthinkingawayoflogicthatbypasses绕过alotofnonsense.Itallowspeopletolookdirectlyatimportantsubjects.Alifetimeofsciencefictionhasinfluencedmorethanjustmyrelationshipwithmydadbuthasalsohelpedmeshapemyownhopesforthefuture.I'mnowasciencewriter. Yessciencefictionhasmademeintoanerd书呆子anditalsohasbeenasourceofjoyformyfamilymakingmeanoptimistwhileenablingmetothinkcriticallyaboutthedangeroftechnology.Thankthoseauthorswhohavesharedtheirvisionstheworldandmyfamilyarebetterforit.ThankmydadwhoisboththebeststorytellerandthebestmanIhaveeverknownbecausehehelpedmerealizethetruthofTennyson'swordsSinceIdippedintothefutureIsawthevisionoftheworldandallthewondersthatwouldbe. 1Whatisthespecialbondbetweentheauthorandhisfather? A.Theirsimilardreams. B.Theirloveforeachother. C.Theircommoninterest. D.Theirpassionforscience. 2Whatdoestheauthormainlyshowinparagraph2? A.Hisdeepimpressiononhisdad. B.Hisfeelingofstayingwithhisdad. C.Hisearliestmemoryofhisdad. D.Hisgoodrelationshipwithhisdad. 3Howdoessciencefictionhelptheauthoratpresent? A.Itleadshimtopursueadesirablecareer. B.Itbringshimthecouragetolivebetter. C.Ithelpshimsolvethedangeroftechnology. D.Itmakeshimbecomeasourceofhisfamily'sjoy. 4Whatmaybethebesttitleforthetext? A.TheWondersofScience B.ThePowerofScienceFiction C.TheVersionsofScienceFiction D.TheTimetogetherwithMyFather
已知点P是双曲线左支上一点F2是双曲线的右焦点且双曲线的一条渐近线恰是线段PF2的中垂线则该双曲线的离心率是．
若且则cos2α＝．
设集合A＝{124}B＝{x|x2﹣4x+m＝0}．若A∩B＝{1}则B＝
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短文.短文中共有10处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Λ并在此符号下面写出该加的词.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. Itwasarainandcoldnight.Ifinishmyeveningclassesandwasabouttogobacktomyhouse.Igotintoataxiandtoldthedrivermydestination.Tomysurprisethedrivermadeanapologysayshedidn'tknowtheway.Whatcomeataxidriverdidn'tknowtheway?Iwasalittleofangry.Atthemomentanoldcouplestoppedourcar.Theirdestinationwasthesameasmesoheletthemin.Thetwogreetedusbutthegrandpatoldthedrivertheway.FromtheirconversationIknewthedriverwasafarmerandhehasbeenataxidriverjustforthreedays. I'malsonewtoZhengzhou.SometimesImakedirectionmistakesbutthereisalwayssomeonecanhelpme.ItwascoldoutsidebutIfeltrealwarm.
2017年5月14日第一届“一带一路”国际高峰论坛在北京举行为了解不同年龄的人对“一带一路”关注程度某机构随机抽取了年龄在15﹣75岁之间的100人进行调查经统计“青少年”与“中老年”的人数之比为911． 1根据已知条件完成上面的2×2列联表并判断能否有99%的把握认为关注“一带一路”是否和年龄段有关 2现从抽取的青少年中采用分层抽样的办法选取9人进行问卷调查．在这9人中再选取3人进行面对面询问记选取的3人中关注“一带一路”的人数为X求X的分布列及数学期望． 附参考公式其中n＝a+b+c+d 临界值表
已知椭圆的离心率为以该椭圆上的点和椭圆的左右焦点F1F2为顶点的三角形的周长为． 1求椭圆C的标准方程 2设该椭圆C与y轴的交点为MN点M位于点N的上方直线y＝kx+4与椭圆C相交于不同的两点AB求证直线MB与直线NA的交点D在定直线上．
已知△ABC的面积是AB＝1则AC＝
假定关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.Recentlyasurveyhascarriedoutonthebreakfasteatinghabitsofhighschoolstudentsinourschool.Herearetheresultofthesurvey.65%ofthestudentshaveabreakfastinthediningroomwhile30%havesnacksinsteadwith5%eatnofoodforbreakfast.Ahealthydietshouldcontaingrainproteinnutsandfruit.Besides80%ofthestudentspreferredtoeatsweetfoodorfastfoodinsteadofregularmeals.Asasayinggo'Wearewhatweeat.'Breakfastisconsideredthemostimportantlymealoftheday.Allofusshouldhaveabalanceddietwhatprovidesenough.energyfortheminsteadofhavingunhealthyfood.
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