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已知二次函数y＝ax2+bx+c（a≠0）的图象如图所示，对称轴是直线x＝﹣1，下列结论： ①abc＜0；②2a+b＝0；③a﹣b+c＞0；④4a﹣2b+c＜0 其中正确的是（ ）
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已知二次函数y=ax2+bx+c的图象如图所示则毛1这个二次函数的解析式为__________2当x
已知二次函数y=ax2+bx+c的图象如图所示则毛1这个二次函数的解析式为__________2当x
已知二次函数y=ax2+bx+ca≠0的图象如图所示则下列结论中正确的是
a＞0
﹣1是方程ax
2
+bx+c=0的一个根
a+b+c=0
当x＜1时，y随x的增大而减小
已知:二次函数y=ax2+bx+c的图象如图所示则ab______0填〉〈或＝
.已知二次函数y=ax2+bx+ca≠0的图象如图所示:1这个二次函数图象的关系式是________
已知二次函数y=ax2+bx+ca≠0的图象如图所示则不等式ax2+bx+c＜0的解集是.
已知二次函数y=ax2+bx+ca≠0的图象如图所示给出以下结论①a+b+c＜0②a－b+c＜0③b
①②③
②③
③④
①④
二次函数y＝ax2＋bx＋c的图象如图所示则方程ax2＋bx＋c＝0的两根为____________
已知二次函数y=ax2+bx+ca≠0的图象如图所示则以下说法不正确的是
根据图象可得该函数y有最小值
当x=﹣2时，函数y的值小于0
根据图象可得a＞0，b＜0
当x＜﹣1时，函数值y随着x的增大而减小
若二次函数y=ax2+bx+c的图象如图所示则直线y=abx+c不过第_____象限.
二次函数y=ax2+bx+c的图象如图所示当函数值y＜0时自变量x的取值范围是__________.
二次函数y＝ax2＋bx＋c的图象如图所示下列结论错误的是A.ab＜0B.ac＜0C.当x＜2时函数
如图已知一次函数y＝0.5x+2的图象与x轴交于点A.与二次函数y＝ax2+bx+c的图象交于y轴上
已知二次函数y=ax2+bx+ca≠0的图象如图所示则不等式ax2+bx+c＜0的解集是.
已知二次函数y=ax2+bx+ca≠0的图象如图所示给出以下结论①a+b+c＜0②a－b+c＜0③b
①②③
②③
③④
①④
二次函数y＝ax2＋bx＋c的图象如图所示则方程ax2＋bx＋c＝0的两根为____________
已知二次函数y＝ax2a≠0与一次函数y＝kx－2的图象相交于AB两点如图所示其中A－1－1求△OA
已知二次函数y=ax2+bx+cabc是常数图象如图所示则当x满足的条件是
已知二次函数y=ax2+bx+ca≠0的图象如图所示则以下说法不正确的是
根据图象可得该函数y有最小值
当x=﹣2时，函数y的值小于0
根据图象可得a＞0，b＜0
当x＜﹣1时，函数值y随着x的增大而减小
已知二次函数y=ax2+bx+ca≠0的图象如图所示且关于x的一元二次方程ax2+bx+c﹣m=0没
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近日在重庆“服役”51年的牛角沱嘉陵江大桥开始大修了这座跨越了半个多世纪的大桥是重庆主城首座城市大桥也是市级文物保护单位．其中大桥桥面部分的施工是大修工程的重点之一主要是进行行车道板改造．工程将拆除桥面现有的混凝土行车道板更换为钢桥面板．请回答下列有关问题 1钢桥面板的主要材料合金填“是”或“不是”选择该材料的原因是填字母序号． A．密度大B．硬度大C．导热性好 2桥梁外表面由于处于潮湿和酸性大气中容易腐蚀生锈．请写出用稀硫酸清洗铁锈的化学方程式． 3如果你是桥梁维护人员请说出一种防止钢铁生锈的方法．
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.作文中共有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Λ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. Thisismyfifthdayatthesummercamp.Lifeisn'texactwhatIexpected.WehavetogetupearlytomakeourbedsbeforeourteacherMissLicometoinspect.Afterbreakfastwehavesomeoffreetime.YesterdaymorningIwentfishingbuttheonlythingIcatchwasatreebranch.Intheafternoontherearedifferentactivitylikehorsebackridingandhiking.They'refunsonothingnewforme.Intheeveningeveryoneisassignedadifferenttasktogetdinnerready.YesterdayIwasinchargeofpreparethehotdogsbutIaccidentallydroppeditinthefire.Thebestpartofcampisatnightwherewesitaroundacampfireandtellstories.
Joyce:Whatdoyouthinkoftheleadteacher'sspeech? Caroline:Ithinkitwas1interest. Joyce:2doI.IhearMikeislikelytowinalltheprizesintheexamsthisyear. Caroline:Yeshisteachersaysso.He3workhardathislessonseveryeveningformonths.HewanttogotoOxfordUniversitynextyear. Joyce:Ihopehewillrealizehisgoal. Caroline:Ihopeso.4Ithinkheworkstoohard.Ihopehe'llgooutandenjoy5forachange.HowaboutyoursonCarl? Joyce:Don'tmentionhim.Carlneverstartsstudying. Caroline:You'rejoking.IheardthatCarl6winthecompositionprize. Joyce:Youhavemade7mistake.ThatisWhiteCarl.MysonisBrownCarl.Thewhitesliveinthesamecommunity8wedo.WhiteCarlhasalwaysbeensohardworking.Hewantstobea9write.Mysonlikesgoingtotheconcert.Heonlylikessinging. Caroline:10hepracticessinginghewillbecomeasingerinthefuture. Joyce:Notallpeoplecanbecomeasinger.Idon'tthinkhehasthetalent.
化学变化有时也是五彩斑斓的下列哪些反应不涉及颜色的变化
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MoneyspentonadvertisingismoneyspentaswellasanyIknowof.Itservesdirectlytoassistarapiddistributionofgoodsatreasonablepricestherebyestablishingafirmhomemarketandsomakingitpossibletoprovideforexportatcompetitiveprices.Bydrawingattentiontonewideasithelpsenormouslytoraisestandardsofliving.Byhelpingtoincreasedemanditensuresanincreasedneedforlabourandisthereforeaneffectivewaytofightunemployment.Itlowersthecostsofmanyservices:withoutadvertisementsyourdailynewspaperwouldcostfourtimesasmuchthepriceofyourtelevisionlicensewouldneedtobedoubledandtravelbybusortubewouldcost20percentmore. Andperhapsmostimportantofalladvertisingprovidesaguaranteeofreasonablevalueintheproductsandservicesyoubuy.Apartfromthefactthattwenty﹣sevenActsofParliamentgovernthetermsofadvertisingnoregularadvertiserdarepromoteaproductthatfailstoliveuptothepromiseofhisadvertisements.Hemightfoolsomepeopleforalittlewhilethroughmisleadingadvertising.Hewillnotdosoforlongformercifullythepublichasthegoodsensenottobuytheinferiorarticlemorethanonce.IfyouseeanarticleconsistentlyadvertiseditisthesurestproofIknowthatthearticledoeswhatisclaimedforitandthatitrepresentsgoodvalue. AdvertisingdoesmoreforthematerialbenefitofthecommunitythananyotherforceIcanthinkof. ThereisonemorepointIfeelIoughttotouchon.RecentlyIheardawell﹣knowntelevisionpersonalitydeclarethathewasagainstadvertisingbecauseitpersuadesratherthaninforms.Hewasdrawingexcessivelyfinedistinctions.Ofcourseadvertisingseekstopersuade. Ifitsmessagewereconfinedmerelytoinformation﹣andthatinitselfwouldbedifficultifnotimpossibletoachieveforevenadetailsuchasthechoiceofthecolourofashirtissubtlypersuasive﹣advertisingwouldbesoboringthatnoonewouldpayanyattention.Butperhapsthatiswhatthewell﹣knowntelevisionpersonalitywants. 1Bythefirstsentenceofthetexttheauthormeansthat. A.heisfairlyfamiliarwiththecostofadvertising B.everybodyknowswellthatadvertisingismoneyconsuming C.advertisingcostsmoneylikeeverythingelse D.itisworthwhiletospendmoneyonadvertising 2InthetextwhichofthefollowingisNOTincludedintheadvantagesofadvertising? A.Securinggreaterfame. B.Providingmorejobs. C.Enhancinglivingstandards. D.Reducingnewspapercost. 3Theauthorthinksthatthewell﹣knownTVpersonalityis. A.verypreciseinpassinghisjudgementonadvertising B.interestedinnothingbutthebuyers'attention C.correctintellingthedifferencebetweenpersuasionandinformation D.obviouslypartialinhisviewsonadvertising 4Intheauthor'sopinion. A.advertisingcanseldombringmaterialbenefittomanbyprovidinginformation B.advertisinginformspeopleofnewideasratherthanwinsthemover C.thereisnothingwrongwithadvertisinginpersuadingthebuyer D.thebuyerisnotinterestedingettinginformationfromanadvertisement
I'velearnedseveralforeignlanguagesasanadultandwasabletolearnFrenchtofluentconversationin17days. In2005IstayedwithaFrenchfriendinaFrenchvillage.NooneinthevillagespokeEnglishandmyfriendrefusedtospeakEnglishaswell. IsetuparoutinewhereIdidthesamethingseveryday. InthemorningIpracticedwritingvocabularyfor2hours.Ibelievewritingthingsoutisthebestwaytomemorizethings. WhilewritingIwouldlistentoFrenchlearningMP3s.It'sreallyhelpfultohearotherstudentsmakemistakesthatyoucanlearnfromjustlikearegularclassroomenvironment. IhadlunchwithmyFrenchfriendseveryday.AstheyrefusedtoslowdownwhenspeakingtomeinFrenchitwastolearnortostarve! IntheafternoonIreadCharlieandtheChocolateFactoryinFrench.Readingthechildren'sbooksyoureadasachildisagreatwaytolearnnewlanguages.Firstlythelanguageusedissimpleandsecondlyknowingthestoryhelpsyoutoguessthemeaningofnewwordsandavoidusingadictionary. IspentanhourwritingbasicessaysaboutthingsthatalwaysgetaskedlikeWhereareyoufrom?Whatdoyoudo?whichIhadmyFrenchfriendcheckforerrors.Bylearningready﹣madeanswersyoupracticewhatyoulearnedandbuildupyourconfidence. Anothergoodtipistolearnthefillerwordswhichpeoplesaybetweensentencesbuthavenorealmeaningallowingyoutobuytimeinconversation. After17daysIwenttoPariswhereImetagirlinacoffeeshop.WhenItoldherIhadbeenlearningFrenchfor17dayssheinsistedthatIhadlivedinFranceforatleastayear. 1Thewritermaycomefrom. A.France B.Germany C.China D.theUSA 2WhichofthefollowingisNOTwhatthewriterdoesinlearningFrench? A.ShewrotenewFrenchwordsonebyoneagainandagaineverymorning. B.ShewouldlistentoaFrenchteachingclassbyMP3whileshewaswriting. C.Shehadsupperwithherfriendseverydaypracticetalkingwiththem. D.Shewroteanswerstosomeusualquestionstobuildupherconfidence. 3Whatisthepurposeofthewritertowritethisessay? A.Totellpeoplethatshewasaverygoodlanguagelearner. B.Tosharewithpeoplesomemethodsoflearningalanguage. C.Tokeeparecordofherexperienceoflearningalanguage. D.Totellpeoplethatitwasnoteasytolearnanewlanguage.
假如你在友好学校CloverportSchool夏令营期间观摩了当地小镇的一个节日活动请根据其中的一项活动宣传单完成一则英文报告.每空限填一词. Helloeverybody!I'msogladtoexperiencetheSacajawea1inthetownofCloverport.It'sacommunityfestivaltobringpeopletogether.TeenMr.Cloverportisacompetitionfor2fromthirteentosixteenyearsold.MynewfriendTristanpaid3dollarstoenterit.Hewasreallyexcitedaboutit.Theyhavetowearhomemadeclothesinsteadofthoseboughtfroma4.IthinkthespiritofDIYreallymatters.Tofollowtherulestheyarenot5tosmokedrinkwineorspeakrudely.Theyshouldbewell﹣behaved.Thankyou!
如图是向氢氧化钠溶液中加入稀盐酸反应的微观示意图以下说法错误的是
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小明同学设计了如下实验方案分离NaCl和CaCl2两种白色粉末的混合物W请回答下列问题 1试剂A的化学名称是． 2操作Ⅱ需要用到除烧杯玻璃棒之外的玻璃仪器还有． 3沉淀B洗涤后加入稀盐酸的化学方程式是该反应的反应类型是．
Jealousofthekidsatschoolwhoaresmarterthanyouandseemtolearnmorequickly?Don'tworry.1 2HoweveraccordingtoarecentstudyIQcanrise﹣﹣notjustbyoneortwopointsbutbyasmanyas21points! ScientistshavefoundthatIQchangesarelinkedtochangesinpartofthebraincalledgraymatterwhichwasseentogrowandbecomedenserinthebrainsofpeoplewhoseIQsimprovedgreatly.3Oneistotrainyourshort﹣termmemory.Previousresearchhasproventhatshort﹣termmemoryisthebasisforintelligencesotryingtorecognizeorretellsomethingthatyouhaveseenorheardcanhelpraiseyouroverallbrainpower.4 Agoodnight'ssleepwillalsohelpimproveyourconcentration.5Ithelpsyoustayfocusedforlongerthenextday. Scientistshavealsofoundthatexercisehelps.Walking30minutesadayfivetimesaweekanddoingexercisewillhelpyoubecomemoreknowledgeableaswellashealthierandfitter. A.Thereareseveralwaysofincreasingyourbrain'sgraymatter. B.Yourbraindealsmoreefficientlywiththingsyoutrulylike. C.Withabitofbraintrainingthechancesarethatyoucanbeassmartastheyare. D.Somaybeit'sagoodideatogetyourbrainintrainingrightaway. E.Gettingenoughsleepislikepushingtheresetbuttoninyourbrain. F.Themoreyouworkonitthebetteryouwillbecome. G.Peopleusedtoassumethataperson'sIQwasunchangeable.
1TotallyWildHotelisspecialbecauseof. A.itshighprice B.itsgoodbreakfast C.thelovelygiraffes D.theoldbuildings 2AccordingtothetextpeoplecaninKenya. A.cheeroncamelsinLamuOldTown B.havebreakfastwithzebrasinTotallyWildHotel C.seelionszebraselephantsinEastNationalPark D.watchthebrightpinkbirdsnearLakeNakuru 3willmostprobablybeinterestedinthetextabove. A.Peoplewhoenjoytravelling B.Scientistswhostudybirds C.Playerswhoaregoodatrunning D.Peoplewhohaveapainintheneck
ThebiggestturningpointinmylifesofarwasthedayIlefthometogotocollege.BytheageofeighteenIhadneverbeenawayfrommyparentsformorethantwoweeks.1 WhenthedaytopackmythingscameIbegantowonderifIhadmadetherightdecision.ItriedtopersuademyselfwiththethoughtthatIwasmovingontoabetterlifebuttherewasstilladoubtinthebackofmymind.DeepinmythoughtswasthatIwasleavingallmyfriendsbehind.2 3IwassadlonelyandmoreterrifiedthanIhadeverbeeninmylife.HoweveronceIhadbeenshowntomyroomandhadmetsomeoftheotherstudentsIbegantofeelalotmorepositive.WithinafewdaysIwasmorecomfortableinmynewsurroundingsandallmydoubtsandfearsdisappeared.ThereweresomanynewthingstoexperienceandpeopletomeetthatIdidnothavetimetobeupset. Oneofthemainreasonswhythiswassuchanimportantchangeformewasthatmylifewastakingacompletelynewdirection.4HoweverIsoonrealizedthatIcouldmanagethemwell. 5Perhapsoneofthelessonsweshouldlearnishowtoturnthosethatarenewtoustoourbestadvantage. A.Peoplehavetomoveonandtherearealwayschangesinourlives. B.AnditwaswithsadnessthatImademywaytothetrainstation. C.SoIviewedmynewindependencewithamixtureofworryandexcitement. D.BythetimeIarrivedatmydestinationIbelievedIhadmadeaterriblemistake. E.IfeltincontrolforthefirsttimeandIwasdoingwhatIwanted. F.Thereweresomeproblemsoflookingaftermyselfsuchaswashingclothesbuyingfoodetc. G.I'dbeenonholidaywithsomefriendssoIcannotsayI'dhadthechancetogettooworriedaboutthemove.
Whenadoglosesalegtheanimaleventuallyfiguresoutthebestwaytogetaroundonthreelegs.Inashorttimethedoglearnstodealwithitsphysicaldisability.Nowscientistshavedevelopedrobotsthatbehaveinmuchthesameway. Wecanfindrobotseverywhere.Robotsbuildcarsplaychessandcancleanyourhouse.Theymaysomedaydriveyourcartoo.TworobotsnamedSpiritandOpportunityweresenttoMarsonamissiontoexploretheredplanet.JeffCluneisacomputerscientistfromtheUniversityofWyoming.Hesaysrobotsalsohelppeopleinnaturaldisasters.Robotsareusedinsearchandrescueoperationsfollowinganearthquake.Theymaysomedayalsobeusedtoexaminethewreckage残骸ofanuclearaccidentliketheoneinFukushimaJapan.Mr.Clunesaysrobotscanbesenttoalotofplacessaidtobeunsafe.Theproblemisthatallofthosetypesofsituationsandenvironmentareextremelyunpredictable.Anditisverylikelythatrobotsandhumansinthosesituationsbecomedamaged.Heandotherscientistsaredevelopingtechnologysothatrobotswillcontinueoperatingafterthefirstsignofinjury.Theywantthemachinestohavetheabilitytomakechangesandcontinueperforminguntiltheycanberepaired. Mr.CluneandresearchersinFrancehaveaddedonemoreoperationtotheskillsetofrobotsworkingunderdifficultconditions.Theysaytheyprogrammedarobotonewithsixlegsandaroboticarmtolearnhowtodealwithinjury.TheirfindingswerereportedinthejournalNature.Mr.Clunesaidthatoncetherobotsbecomedamagedtheyusetheirintuition直觉andknowledgeofhowtheirbodyworkstofindawaytodealwiththedamage.Hesaystherobotsarealsoprogrammedwithchild﹣likecuriosity.Inotherwordstheyarealwaysaskingquestionsandlookingforanswers.Thewholeprocesstakesaboutaminutefortherobotstofindawaytoovercomedamage. 1Atthebeginningofthepassagethewritermentionsdogsto. A.introducethetopicinamoreattractiveway B.provideexamplesofhowanimalsdealwithunexpectedinjury C.provehowscientistsgetinspirationfromdogstodeveloptechnology D.showtherelationshipbetweendogsandrobots 2AccordingtothepassagenowadaysrobotsCANNOT. A.helppeopleinsearchandrescueoperationsfollowinganearthquake B.besentonamissiontoexploreontheMars C.examinethewreckageofanuclearaccident D.buildcarsorcleanthehouse 3WhyareMr.Cluneandotherscientistsdevotedtodevelopingthetechnology? A.Theyexpecttoenablerobotstocontinueworkingdespiteinjuryunderdifficultconditions. B.Theywanttosucceedinprogrammingrobotwithchildlikecuriosity. C.TheyaredeterminedtodesignamorepowerfulrobotforMarsexploration. D.Theyintendtomakerobotswhichcanbesenttoalotofplacessaidtobeunsafe. 4Nowscientistshavedevelopedrobotsthatoncedamagedcan. A.continueperforminginspiteofthedamage B.relyontheirfunctionstofigureoutawaytohandlethedamage C.spendaboutanhourfindingawaytoovercomedamage D.maintaintheirchildlikecuriosityandkeepaskingpeoplearoundforsolutions
Iloveagoodmurdermystery.Itisso1towatchorreadanexcitingandinterestingdetectivestoryandtrytosolvethe2yourself.AgathaChristieisundoubtedlyqueenofthedetectivestoryconsideringshe3overeightybooks.Manypeoplehavefalleninlovewithher4﹣﹣﹣﹣﹣HerculePoirotafamousBelgiandetectiveandMissMarpleanoldladywhoisalsoanamateur5. AsIamabig6ofAgathaChristieIwasexcitedto7herhouseinDevoncalledGreenway.Itravelledtoher8bysteamtrain.Wewentthroughadarktunnelandtherewaslotsofsmoke.Itwasa9settingforamurderlikeinherfamousnovelMurderontheOrientExpress.10allthepassengersarrivedsafely! AfterapleasantwalkthroughthewoodsI11thesplendidhouse.IdidatourandIlovedseeingwhereshewroteher12.Manyfirsteditionswereondisplayinarevolving旋转的bookcase.Howevermy13partoftheestate房产wastheboathouse.Therewasalovelyviewoftheriver14theboathousealsoservedamorespecialpurpose﹣﹣﹣inspirationforacrime15.InthePoirotnovelDeadMan'sFollyagirl'sbodyis16intheboathouse.Theyeven17theTVadaptationofthebookatGreenway. Ireally18myvisittoGreenway.Itwassucha19placeandIwasinterestedinseeingwhereAgathaChristiewas20towritesomanyexcitingstories. 1A.upset B.serious C.successful D.fun 2A.doubt B.problem C.murder D.method 3A.read B.wrote C.saw D.contributed 4A.creations B.inventions C.discussions D.reasons 5A.guard B.detective C.creator D.spy 6A.guide B.fellow C.fan D.gift 7A.watch B.rebuild C.explode D.visit 8A.house B.family C.hometown D.site 9A.perfect B.central C.colorful D.direct 10A.Sadly B.Fortunately C.Hopefully D.Surprisingly 11A.fetched B.got C.reached D.mentioned 12A.posts B.poems C.letters D.books 13A.personal B.useful C.rewarding D.favourite 14A.or B.and C.but D.for 15A.scenery B.sight C.view D.scene 16A.dissolved B.tended C.found D.buried 17A.developed B.filmed C.adapted D.affected 18A.enjoyed B.treasured C.exploited D.focused 19A.shocking B.beautiful C.skilful D.helpful 20A.inspired B.disappointed C.marked D.honored
假定你是李华你校英文报心理与健康栏目拟刊登一篇文章为高三备考的学生如何安排课余生活和释放心理压力提出建议.请你为此栏目写一篇英语短文要点如下: 1.高三学习的挑战和困难 2.如何安排课余生活 3.如何释放心理压力 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯; 3.开头语已为你写好. LifeinSeniorThreeisnoteasy.
InthesmalltownsoftheUnitedStatesinthe1nineteencenturythegeneralstorewas2everyoneboughtthethingshecouldn'tmake3growathome.Whatthestoressold4tellagreatdealabout5lifeatthattime.Peopleboughttoolsthattheyneededforfarmwork;saltsugarand6foodsthatthefarmdidn'tproduce;articlesofclothingthattheycouldn'tmake7;shirtsforthemen;orclothesforthechildren.Lifewassimplethen.Onefeelsthatpeoplewere8thankforwhattheyhadandthattheylookedforwardwithcourageto9thefuturebrought.Itwouldbeinterestingtoknowhowtheywouldfeelaboutthelifetoday.Woulditseemtothemthatlifeistoocomplex?Wouldtheyenjoy10livealifeaswedonow?
MoviefansknowthattheiractionheroSupermandoesnotreallyfly.AndinthemovieSupermanReturnsanothervisualtrickisplayedonviewers.Themantheyseeflyingisnotreal.Heiswhatiscalledavirtualactor.Thefirststepincreatingthisdigitalactoristohavearealpersonstandinaroomcalledalightstage.Acomputerthencapturestheoutlinesandshapesofhisfaceandrecordshowtheythrowofflight.PaulDebeveciswiththeInstituteforCreativeTechnologiesattheUniversityofSouthernCalifornia. Wecanlightthemwithveryspeciallycomputer﹣controlledillumination照明andtakephotosofthemfromsevendifferentviewpointswithhighqualitydigitalstillcameras. Mr.Debevecispartofateamworkingtocreatecomputerizedimagesofpeopleobjectsandenvironmentsthatlookandactreal.ThelightstagepermitsactorstobeturnedintodigitalversionsofthemselvesmuchlikethebluecreaturesinthemovieAvatar.Therealworldcouldsoonbeusingasimilartechnology.ComputerexpertsattheInstitutearedevelopinga3﹣Dvideoteleconferencingsystem.Itwouldsendavideoimageofapersonintoameetingroom.Thatimagewouldbeabletoworkwiththepeopleintheroomwhowouldseeitin3﹣Dwithoutspecialeyeglasses.PaulDebevecsays: Thepersonwhoisbeingtransmittedtoaremotelocationcanactuallylookaroundatthepeopleintheroomandeverybodyinthatroomknowswhothey'relookingat.Andthat'ssuchafundamentalpartofhumancommunication. Hebelievesthebusinessworldwillbegintouse3﹣Dvideoteleconferencinginthenextfiveyears.It'salsoamediumwithwhichyoungpeopletodayareparticularlycomfortablehesaid.Ademonstrationofaninteractionbetweenanearthquakesurvivorandstudentsmaybepossibleinayear.In10yearswemaybeabletoplay3﹣Dvideogameswithoutspecialglasses. 1WhydoestheauthormentionthemoviesSupermanReturnsandAvatarinthepassage? A.Tocomparetheirdifferentstyles. B.Toexplain3﹣Dfilm﹣makingtechnology. C.Toattractmorereaderstowatch3﹣Dfilm. D.Todescribetheoriginof3﹣Dfilmindustry. 2Whichofthefollowingshowshowavirtualactorismade? a.arealactorstepsinsidealightstage. b.anactoriscreatedintodigitalversion. c.photosaretakenfromdifferentaspects. d.howtheactor'sfacereflectsthelightisrecorded. e.acomputermakessurehowtheactor'sfaceisfilmed. A.a→e→d→c→b B.a→c→e→d→b C.a→e→c→f→b D.e→d→c→a→b 3Whatistheauthor'sattitudetowards3Dtechnology? A.Cautious B.Positive C.Skeptical D.Critical 4What'sthemainideaofthetext? A.3﹣Dgoesfrommoviestorealworld. B.3﹣Dfilmbecomespopularworldwide. C.3﹣Dteleconferencingsystemcomesintobeing. D.3﹣Dgameswithoutspecialglassesbecomestrue.
Soyouwanttodrawmoneyfromabank?Doityourself.WanttofixtheInternetconnection?Doityourself.Needaboardingcardforyourflight?Doityourself.Intheorycompaniescansavemoneybyreplacinghumanworkerswithautomatedself﹣servicesystemswhilecustomersgainmorechoicesandgetquickerservice.Surelytheexpansionofself﹣serviceintomoreandmoreareasistobewelcomed? Notnecessarily.Whenitisdonewellself﹣servicecandogoodtobothcompaniesandcustomers.Butwhendonebadly﹣whohasnotfoundthemselvestrappedinaseriesofendlesstouch﹣tonemenus?Inareaswhereself﹣serviceisonlyjuststartedthisislessofaproblem:angrycustomerscanafterallalwaystaketheirbusinesselsewhere.Butifeverybankweretopreferself﹣servicesystemscustomerswouldnolongerbeabletoexpresstheirdiscountbyvotingwiththeirfeet.Asaresultsomebanksforexamplealreadypromisethattheirtelephone﹣bankingservicesalwaysofferthechoiceoftalkingtoahumanoperator.Butinreturnforhumanservicemanycompanieswillsimplychargemore. Anotherdisagreementtoself﹣serviceisthatwhileitsavescompaniesmoneyitdoesnotalwayssavetheircustomers'time.Inthebestcasesitdoesofcourse:checkingyourselfinattheairportcanbequickerthanqueuingormakingaphonecall.Butasmoreandmoretasksareontocustomerstheymaystarttohopeforthedaysofold﹣fashionedservice. Allofthissuggeststhattherearelimitstohowfarself﹣servicecanbetaken.Companiesthatgotoofardowntheself﹣servicerouteortodoitincorrectlyarelikelytofindthemselvesbeingpunished.Insteadabalancebetweenself﹣serviceandtraditionalformsofserviceisnecessary. 1Whatadvantagesdoestheself﹣servicetechnologycertainlybring? A.Cuttingthecostforthecompanies. B.Savingmoneyforcustomers. C.Offeringcustomersextramoney. D.Defeatingthetraditionalformsofservice. 2Whatdoesthewritermeanbysayingcustomerswouldnolongerbeabletoexpresstheirdiscountbyvotingwiththeirfeet? A.Customerswouldbesoangrythattheykickanddamagethemachineprovidingself﹣service. B.Customerswouldnotbeabletoexpresstheirangeratthebank'sservicebyleavingthere. C.Customerswouldtrytheirbesttopersuadethebanktostopself﹣service. D.Customerswouldelectsomeleaderstohaveatalkwiththebank. 3Fromthispassagewecanseethatthewritertheuseofself﹣service. A.dislikes B.supports C.thinkshighlyof D.makescarefuljudgmenton
ScientistsinArgentinahavecreatedtheworld'sfirstcowwithtwohumangenesthatwillenableittoproducehuman﹣likemilk. Geneticengineeringwasusedtointroducethemothers'milkgenesintotheanimalbeforebirthaccordingtotheNationalInstituteofAgribusinessTechnologyinBuenosAires. Asanadulttheclonedcowwillproducemilkthatissimilartohumansinwhatwillproveadevelopmentofgreatimportanceforthenutritionofinfantssaidtheinstitute.TheclonedcownamedRositaISAisthefirstintheworldthatincorporatestwohumangenesthatcontaintheproteinspresentinhumanmilksaidthestatement. TheArgentineteamsaidtheChineseonlyintroducedonehumangenewhiletheirresearchinvolvedtwomeaningthemilkwillmorecloselyresemblethatofhumans. Ourgoalwastoraisethenutritionvalueofcows'milkbyaddingtwohumangeneswhichdogoodtotheimmunesystemoftheinfants.saidAdrianMuttofromtheNationalUniversityofSanMartinwhichworkedwiththeinstitute. CristinaKirchnerPresidentofArgentinasaidthatthescientificinstitutemakesallArgentinesproud.Shealsorejectedthatshehadrejectedthehonourofhavingthecownamedafterher.TheycametotellmethatthenameisCristinabutwhatwomanwouldliketohaveacownamedafterher?ItappearedtometobemorepropertocallitRosita. 1WhydidthescientistsinArgentinaintroducetwohumangenesintotheclonedcow? A.BecausetheChineseengineersonlyintroducedonegeneintheirresearch. B.BecauseCristinaKirchnerPresidentofArgentinaexpectedthemtoincorporatetwogenes. C.Becausetwohumangenesenabledthecowtoproducemorenutritiousmilkfortheinfants. D.BecauseMuttofromtheNationalUniversityofSanMartinthoughttheycouldbethefirst toincorporatetwogenesinthecow. 2WhatcanbeinferredfromCristinaKirchner'sstatements? A.Shewasquitesatisfiedwiththeresearchdonebytheinstitute. B.Sheconsidereditanhonortonamethespecialcow. C.Shefeltitimpropertobenamedafterthecow. D.Sherefusedtogiveanametothecowoutofself﹣respect. 3WhichofthefollowingcanbestreplacetheunderlinedexpressioninParagraph4? A.havemorevarietiesthan B.bemoresimilarto C.havemorenutritionthan D.bemoredifferentfrom 4What'sthepassagemainlyabout? A.Theimportanceofgeneticengineering. B.Waystoimprovemother'smilk. C.Aclonedcowtoproducehuman﹣likemilk. D.AdvancedagriculturaltechnologyinArgentina.
“水培”是一种新型无土栽培其肥料是植物营养液下列营养液与草木灰草木灰显碱性混合使用后会降低肥效的是
“84”消毒液是生活中常见的物质主要用于杀菌消毒和漂白．如图为某厂家生产的“84”消毒液的商品标签 工业上一般用反应Cl2+2NaOH＝NaCl+NaClO+H2O生产NaClO．请回答 1计算该消毒液NaClO中氯元素的质量分数结果保留0.1%． 2生产1吨该消毒液至少需要多少千克烧碱 3某同学将50g含NaClO5%的“84“消毒液稀释至1%需向原溶液中加入多少克水
TimeTravel Ifyoucouldtravelintimewherewouldyougo?PerhapsyouwouldwatchanoriginalperformanceofaShakespeare'splayinElizabethanEngland?WhatabouthangingoutwithLaoziintheSpringandAutumnPeriod?Ormaybeyou'dvoyagefaraheadofthepresentdaytoseewhatthefutureholds. Thepossibilityoftimetravelisindeedappealing.Storiesexploringthesubjecthavebeenaroundforhundredsofyears.PerhapsthebestknownexampleissciencefictionnovelTheTimeMachinewhichwaswrittenbyH.G.Wellsandpublishedin1895forthefirsttime.Itwasadaptedintoatleasttwofeaturefilmsofthesamenameaswellastwotelevisionversionsandalargenumberofcomicbookadaptations.Itisgenerallycreditedwiththepopularizationoftheconceptoftimetravelusingavehiclethatallowsanoperatortotravelpurposefullyandselectively.ThetermtimemachinecoinedbyWellsisnowuniversallyusedtorefertoavehicletransportingpeopleintothefarfuture. Butcouldtimetravelactuallybepossible?Somescientistssayyesintheory.Theyproposeusingcracksintimeandspacecalledwormholeswhichcouldbeusedasshortcutstootherperiods.Einstein'stheoryofrelativityallowstimetravelinextremecircumstances.AndBritishphysicistStephenHawkingsaysyoucouldtravelintothefuturewithareallyfastspaceship﹣goingatnearlythespeedoflight.Thoughbuildingsuchaspaceshipwouldofcoursebenosimpletask. Evenifyoucouldtravelintothepastthereissomethingcalledthegrandfatherparadox.Itaskswhatwouldhappenifatimetravelerweretogobackintimeandhavehisowngrandfatherkilledforsomereasonandthereforepreventhimselffrombeingborn.Ifthetimetravelerwasn'tbornhowwouldhetravelbackintime? Andwouldyoureallyliketovisitthefuture?InH.G.Wells'bookthemaincharactertravelsintodistanttimewherehearrivesatabeachandisattackedbygiantcrabs.Hethenvoyages30millionyearsintothefuturewheretheonlylivingthingisablackobjectwithtentacles触角.Ifthat'swhat'sinstoremaybewearebetterjustlivinginthepresentdayafterall. 1ThenovelTheTimeMachinementionedinParagraph2aimstoshow. A.thespecialfeatureofthebook B.People'sinterestintimetravel C.thelonghistoryoftimetravel D.thecontributionofH.G.Wells 2Einstein'sandHawking'stheories. A.suggestthepossibilitytoinventthetimemachine B.havesimilaritiesinmanyways C.haveprovedwrongbysometimetravelers D.pushtheinventionofthefirstspaceship 3InParagraph4grandfatherparadoxprobablyreferstotheideathat. A.thetravelerispreventedfrommeetinghisgrandfather B.thetravelergoesbackintimetoseekforhisgrandfather C.thegrandfather'sdeathmakesthetraveler'sbirthimpossible D.Thereunionofthetravelerandhisgrandfatherbringshappiness 4Accordingtothepassagewhatisprobablytheauthor'sattitudetowardstimetravel? A.Supportive. B.Unconcerned. C.Unclear. D.Skeptical.
I'vereadlotsofstoriesaboutfamilymemories.Inthose1.I'vefoundvoiceofsadnessandlonging.It'struethatsomuchinourdailylivesmakesus2allthetime.Wefindourselveswithlessandtimetospendwithour3andfriends.I'vehadthesame4myself. Iusedtohave5timeswithmygrandfatherwhenwelivedtogether.WhenIwasveryyoungIoftenenjoyedspendingtimeinhis6watchingtheflowersandwateringthefruittrees.ButasIgrewupI7becameselfish. OncewhenIwas6wewentshoppingtogether.Aswetookthewrongbusandendedupgetting8unabletofindourwayback.Icouldn'tstay9andshoutedrudelyinhisface.Iwassostubborn固执的thatIwouldn'tstaysorry10returninghomethinkingIhaddonenothingwrong. NowI11howridiculous可笑的Iwasatthetime!AndIalsorealizehow12itwaswhenIfinallyadmittedIwas13!WhenItrulywantedtoexpressmy14mygrandfatherhadleftus15leavingmewithnomorechanceto16mymistake.Icouldn't17saytohimthethreewords﹣﹣﹣﹣Iamsorry. Wearespendingmoreandmoretimeoutsidewithlessandlesstimeto18withourfamiliesathome.So19themostofeverysecondyouhavewithyourlovedonesbecausetime20goingwaitingfornoone. 1A.books B.stories C.reports D.films 2A.crazy B.easy C.busy D.angry 3A.families B.classmates C.colleagues D.employers 4A.adventure B.research C.exploration D.experience 5A.good B.hard C.sad D.urgent 6A.kitchen B.garage C.house D.garden 7A.frequently B.rarely C.gradually D.finally 8A.bored B.lost C.hurt D.upset 9A.calm B.awake C.firm D.happy 10A.while B.unless C.until D.after 11A.learn B.imagine C.realize D.agree 12A.early B.late C.nice D.guilty 13A.serious B.nervous C.wrong D.painful 14A.concern B.worry C.opinion D.regret 15A.forever B.somehow C.alone D.instead 16A.careabout B.apologizefor C.thinkof D.referto 17A.again B.often C.even D.still 18A.spare B.save C.take D.kill 19A.follow B.receive C.divide D.make 20A.needs B.keeps C.misses D.stops
Alexis17satquietlyinthepassengerseatofherdad'scar.Shelethereyeslazilyscanthelandscapeforwildlife.Thenadeercameintoviewabout200yardsinfrontofthem.Dadthere'sadeerthere!Alexissaid.Itwasamaledeerwithsharpantlers角oneachsideofitshead. AsthecarmovedcloserAlexissawthatthedeer'sheadwasbenttowardtheground.Thensheheardascreamandsawanarmflyupnearthedeer'shead.Alexisrealizedthedeerwasattackingawoman.Suea44﹣year﹣oldmotherhadbeenoutforhermorningrun.Thedeerfollowedherandedgedcloser.IknewIwasintroubleSuesays.Shewenttopickupastickforself﹣defenseandthedeercharged.Itliftedherwithitsantlersandthrewherintotheair.Suecouldfeelbloodflewdownherleg.Withinsecondsthedeerhadpushedherofftheroad. WhenAlexisandherfatherpulledupthedeerwasthrowingSuelikeadoll.Alexislookedintothewoman'sterrifiedeyesandbeforeherfatherhadevenstoppedthecartheteenagerjumpedquicklyoutofthecarandrantowardthedeer.Iwaskickingittogetitsattentionshesays.Thenherfatherwhohadfollowedhisdaughterpushedthedeerawayfromthewomen. AlexishelpedSueintothecarandthenappliedapieceofclothtoSue'sinjuredleg.We'regoingtogetyoutoahospitalAlexissaid.Thensheheardherfathershoutloudly.Hehadbeenknockedtotheground.Alexistookholdofahammerfromthecarandrantowhereherfatherlayonhisback.Shebeatthedeer'sheadandneckbuttheblowsdidn'tscareitaway.Iwaslosingfaithshesays.AcouplemorestrikesAlexissaidherfather.Youcandoit.TurningthehammeraroundAlexisclosedhereyesandbeatthedeer'sneckwithallherstrength.Whensheopenedhereyesthedeerwasrunningaway.Alexisgotinthedriver'sseatandspedtowardthenearesthospital. AfterSuewastreatedshetearfullythankedherrescuers.Youexpectateenagegirltogetonthephoneandcallforhelpshesaysnottobeatupadeer. 1WhatwasSuedoingwhenshewasattackedbythedeer? A.Shewasdrivinghome. B.Shewasrestingontheroad. C.Shewastakingexercise. D.Shewasfeedingwildanimals. 2WhatdidAlexisdotosaveSue? A.Shepushedthedeeraway. B.Shehitthedeerwithherfeet C.Shedrovethecartohitthedeer. D.Shebeatthedeerwithahammer. 3WhichofthefollowingwordscanbestdescribeAlexis? A.Strong. B.Cruel. C.Energetic. D.Brave. 4Whatisthebesttitleforthepassage? A.AWomanWasSeriouslyInjured B.ADangerousDeerAttackedaWoman C.AGirlRescuedHerFatherSuccessfully D.ATeenagerSavedOthersfromaDeerAttack
氢气是目前最清洁的燃料请根据氢气制备原理及性质回答下列问题 1对图1装置图仪器名称描述正确的是请填字母序号． A．①为酒精灯B．B为分液漏斗C．C为锥形瓶 2实验室制取并收集氢气所需的仪器是选填以上装置图编号． 3图2是检验氢气的部分装置请问装置G的作用如果气流中存在氢气在装置H中观察到的现象是产生该现象的原因是请用化学方程式解释该反应物中具有还原性的物质是填化学式．
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