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如图，AB是半圆O的直径，点P是半圆上不与点A，B重合的动点，PC∥AB，点M是OP中点． （1）求证：四边形AOCP是平行四边形； （2）连接BP，当∠ABP＝ 度时，四边形AOCP是菱形...
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如图AB是半圆O.的直径C.为半圆上一点N.是线段BC上一点不与B.﹑C.重合过N.作AB的垂线交A
已知AB是半圆O.的直径点C.是半圆O.上的动点点D.是线段AB延长线上的动点在运动过程中保持CD=
如图圆O.的直径为5在圆O.上位于直径AB的异侧有定点C.和动点P.已知BC∶CA＝4∶3点P.在半
如图AB为⊙O.的直径作弦CD⊥AB∠OCD的平分线交⊙O.于点P.当点C.在下半圆上移动时不与点
B.重合），下列关于点P.描述正确的是( )
A.到CD的距离保持不变
到D.点距离保持不变
等分
位置不变
如图AB是半圆O的直径C为半圆上一点N是线段BC上一点不与B﹑C重合过N作AB的垂线交AB于M交A
已知AB是半圆O.的直径点C.是半圆O.上的动点点D.是线段AB延长线上的动点在运动过程中保持CD=
已知AB是半圆O.的直径点C.是半圆O.上的动点点D.是线段AB延长线上的动点在运动过程中保持CD=
已知AB是半圆O.的直径点C.是半圆O.上的动点点D.是线段AB延长线上的动点在运动过程中保持CD=
如图AB是半圆O.的直径C.为半圆上一点N.是线段BC上一点不与B.﹑C.重合过N.作AB的垂线交A
如图AB是以O.为圆心的半圆的直径半径CO⊥AO点M.是上的动点且不与点A.C.B.重合直线AM交直
如图AB是半圆O.的直径点P.是半圆上不与点A.B.重合的一个动点延长BP到点C.使PC=PBD.是
如图在⊙O.上位于直径AB的异侧有定点C.和动点P.AC=AB点P.在半圆弧AB上运动不与A.B.两
如图在⊙O上位于直径AB的异侧有定点C.和动点P.AC=AB点P.在半圆弧AB上运动不与A.B.两点
如图AB是半圆O.的直径C.为半圆上一点N.是线段BC上一点不与B.﹑C.重合过N.作AB的垂线交A
如图AB是大半圆O的直径AO是小半圆M的直径点P是大半圆O上一点PA与小半圆M交于点C过点C作CD⊥
如图①AB是半圆O的直径以OA为直径作半圆CP是半圆C上的一个动点P与点AO不重合AP的延长线交半圆
如图AB是半圆O.的直径AB=弦AC=点P.为半圆O.上一点不与点A.C.重合.则∠APC的度数为.
如图AB是半圆O.的直径C.为半圆上一点N.是线段BC上一点不与B.﹑C.重合过N.作AB的垂线交A
AB是半圆的直径延长AB至C.使CB=BOOC=4点P.是半圆上一动点不与
B.重合)，∠ACP=a，则a的取值范围是 （ ）
A.0°
0°
0°
不确定
如图圆O的直径为5在圆O上位于直径AB的异侧有定点C和动点P已知BCCA=43点P在半圆弧AB上运动
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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. TheoldsayingTheearlybirdcatchesthewormshowustheimportanceofplanningworkinghardandtryingconstant.Toachieveoutstandingresultsmostpeoplemustplanaheadandworkdiligentlytoovercomeallkindofdifficulties. Thathasbeenmyownexperienceeither.WhenIfirststartedhighschoolIseldompassedrayexamssoIneverpreparedwell.LatermyteacherMr.Blackadvisedmeplaneverythingintheadvance.Sheaskedmetostudyhardaswell.AfterayearofputtinghisadviceontopracticeIcannoweasilypassallmyexams.Therearenoshortcutstosucceed.
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.
下列变化属于化学变化的是
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.
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
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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!
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Itwasourschool'syearlydancingshow.I1beexcitedthatIwaschosenbytheteacherthistimealthoughIdidn'thaveanyexperienceofdancingforashow.Iwoulddanceinfrontofallthestudentsand2teacher.Itmademeveryproud. HoweverIwasabitsad3myfatherhadnotimetowatchmedance.He4invitetohaveabusinessmeeting.Iknewthatmyfatherwouldsurelycometomyshowifhecould.5luckymymotherandmyeldersisterwerestillcomingtowatchmyshow. 6thebeginningofthedayIwasverynervous.AfterchangingintothedressandgettingmymakeupdoneIfelt7relax.ThenIwentontothestagebravely.Iwasverygladtoseemymotherandsistersittingin8secondrow. JustbeforethelightsturneddarkIsawmyfatherrushintothehallandtaketheseatbesidemymother.9apleasantsurpriseitwas!Thesightofmyfathermade10Ismile.Ibegandancingconfidently.Soonaftertheshowmyfamilycamebackstagetocongratulateme.Iwassohappyandluckytohavemyfamily'ssupport.
Theworldhasaplasticsproblem.Andnotjustwithbottles.Straws吸管toothbrushestoys﹣allkindsofplasticsareplacedinlandfills.Thereare5billiontonsofplasticwasteintheworld.Landfillshavealargepartofit.By2050theycouldhave13billiontons. Muchofplasticrubbishfindsitswayintotheocean.Scientistssay165milliontonsofplasticpiecesarefloatingaroundoutthere.Andmostplasticwon'tdisappearitself.Itwillremainintheoceanforever.Whalesgetcaughtinplasticfishingnets.Birdsdiebecauseofeatingplasticstrawsandbottlecaps.Itendangersoceanlife.Plasticrubbishevenendsupinthefoodweeat. Governmentsarerealizingthatrecyclingmaynotbeenough.Theyaretakingmoreactions.Thoughitishardworkitisstillasolvableproblem.InBritainpeoplearenotallowedtouseplasticbagsexceptinhospitals.ScotlandandseveralcoastalcitiesintheUSstoppeoplefromusingplasticstrawsaswell.TheUSalonethrowsawaysome500millionplasticstrawsaday.That'senoughtocircletheEarthtwice.SayingnotoaplasticstrawisaneasywaytomakeabigdifferenceDanaLofflinwhostartedsaid.Dowereallywanttopassontoourchildrenaworldharmedbyplastic? Peoplehavefoundsometastywaystoreducewaste.AcompanyinIndiamadethefirst﹣everspoonthatpeoplecaneat.Youdon'thavetoeatthespoon.Youcanthrowitaway.Itdecomposes分解injustafewdays.DavidEdwardsascientistatHarvardUniversitydesignedaneatablebagwhichcanprotectthefoodordrinkinside.Itisadeliciousreplacementforplasticones. 1Accordingtothewritebirdsdiebecausethey. A.eatbottlecapsandstraws B.getcaughtinfishingnets C.feedonoceananimals D.havethespoonsinIndia 2TheunderlinedwordendangersinParagraph2probablymeans. A.brings B.loses C.harms D.saves 3Thepurposeofthepassageismainlyto. A.introducesomewaystorecyclewaste B.tellreadersabouttheproblemwithplastics C.compareairpollutionandplasticpollution D.describehowtheUSisreducingplasticwaste 4Fromthepassagewecantellthattheplasticsproblem. A.istoobigforpeopletosolve B.canbesolvedbyrecyclingalone C.canbesolvedbutitwontbeeasy D.willhavetobesolvedbyfuturescientists
生活中困难不可避免面对各种困难需要信心.假如你是李华尝试举例说明信心在学习考试生活等方面的作用并就面对困难的态度谈谈你的看法. 注意:1可适当增加细节以使行文连贯; 2词数100左右. .
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.
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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.
水是生命之源．下列有关水的说法正确的是
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.
“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
下列实验操作中错误的是
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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