首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
第一篇 Recycling Around the World Recycling is one of the best environmental success stories of th...
查看本题答案
包含此试题的试卷
理工类《单选集》真题及答案
点击查看
你可能感兴趣的试题
被白先勇评价为第一篇台湾中国作家受西方存在主义影响产生的第一篇探讨人类基本存在困境的小说是丛甦的哪部
《自由人》
《野宴》
《盲猎》
我国的第一篇论文学是文章是
鲁迅的第一篇小说是用文言写的1918年起他参加了和编辑活动这年五月他发表了中国现代文学史上第一篇小说
我国第一篇白话小说是鲁迅的作品
被认为是批判现实主义的第一篇宣言
第一篇记事详细完整的编年体史书是
被称为中国文学批评史上第一篇文论专篇
我国现代的第一篇白话小说是鲁迅作的呐喊
孙子兵法的第一篇是
《作战篇》
《计篇》
《谋攻篇》
鲁迅的第一篇小说是用写的
是伍尔芙的第一篇意识流作品
第一篇报告文学作品是
鲁迅先生创作的第一篇白话小说同时也是中国现代文学史上的第一篇白话小说是________这部小说写在_
法经的第一篇是______
绘画的第一篇浪漫主义宣言是指司汤达的
张天翼的第一篇小说是
是我国古代诗论的第一篇专著
标志着汉赋正式形成的第一篇作品是的
中国文学批评史上第一篇鉴赏论的专篇是
法经的第一篇和第二篇分别是____和____
热门试题
更多
BlackHoles Mostscientistsagreethatblackholesexistbutarenearlyimpossibletolocate.Ablackholeintheuniverseisnotasolidobjectlikeaplanetbutitisshapedlikeasphere球体.Astronomers天文学家thinkthatatthecenterofablackholethereisasinglepointinspacewithinfinite无限的density稠密.Thissinglepointiscalledasingularity奇点.Ifthesingularitytheoryiscorrectitmeansthatwhenamassivestarcollapsesallthematerialinitdisappearsintothesingularity.Thecenterofablackholewouldnotreallybeaholeatallbutaninfinitelydensepoint.Anythingthatcrossestheblackholeispulledinbyitsgreatgravity. Althoughblackholesdoexisttheyaredifficulttoobserve.Thesearethereasons. ●Nolightoranythingelsecomesoutofblackholes.Asaresulttheyareinvisibletoatelescope. ●Inastronomicaltermsblackholesaretruly.Forexampleablackholeformedbythecollapseofagiantstarwouldhaveaneventhorizon视界only18milesacross. ●ThenearestblackholeswouldbedozensoflightyearsawayfromEarth.Onelightyearisabout6trillion万亿miles.Eventhemostpowerfultelescopescouldnotpickoutanobjectsosmallatsuchagreatdistance. In1994theHubbleSpaceTelescopeprovidedevidencethatblackholesexist.Therearestillanswerstobefoundhoweversoblackholesremainoneofthemysteriesoftheuniverse. Thecenterofablackholeisempty.
第二篇Hurricane飓风Katrina Ahurricaneisafiercelypowerfulrotating旋转的formoftropicalstormthatcanbe124to1240milesindiameter.ThetermhurricaneisderivedfromHuricanthenameofanativeAmericanstormgod.Hurricanesaretypicalofacalmcentralregionoflowpressurebetween12to60milesindiameterknownastheeye.Theyoccurintropicalregions.Overitslifetimeoneofthesecanreleaseasmuchenergyas10000nuclearbombs. Theseedforhurricaneformationisacluster聚集ofthunderstomsoverwarmtropicalwaters.Hurricanescanonlyformandbefedwhenthesea-surfacetemperatureexceeds27℃andthesurroundingatmosphereiscalm.TheserequirementsaremetbetweenJuneandNovemberinthenorthernpartoftheworld. Undertheseconditionslargequantitiesofwaterevaporate蒸发andcondense冷凝intocloudsandrain-releasingheatintheprocess.ItisthisheatenergycombinedwiththerotationoftheEarththatdrivesahurricane. Whenthewarmcolumnofairfromtheseasurfacefirstbeginstoriseitcausesanareaoflowpressure.Thisinturncreateswindasairisdrawnintothearea.Thisspinningwinddragsupmoremoistairfromtheseasurfaceinaprocessthatstrengthensthestorm.Coldairfallsbacktotheoceansurfacethroughtheeyeandontheoutsideofthestorm. Initiallywhenwindspeedsreach23milesperhourthesemildwetandgreyweathersystemsareknownasdepressionsorlowairpressure.HurricaneKatrinaformedinthiswayoverthesouth-easternBahamason23August2005.KatrinahashadadevastatingimpactontheGulfCoastoftheUSleavingadisasterzoneof90000squaremilesinitswake尾迹-almostthesizeoftheUK.Thousandshavebeenkilledorinjuredandmorethanhalfamillionpeoplehavebecomehomelessinahumanitarian人道主义的crisisofascalenotseenintheUSsincetheGreatDepression.Thecostofthedamagemaytop$100billion. Theeyeofahurricanereferstoits
SomeUnusualCelebrationsSomeholidaysarewell-knownallaroundtheworld.AmongthemareNewYear’sEvecelebrations.AlsocommonaredaysinhonorofloveandfriendshiplikeValentine’sDay.EachcountryhasitsownspecialholidaystoooftentomarkimportanteventsinItshistory.Schoolsbanksandgovernmentofficesallcloseondayslikethese.______46Afewofthemarereallyverystrange.Ofcoursetheyarenotstrangetothepeoplewhocelebratethem.Perhapsthatisbecausethecelebrationshavelongtraditions.ConsiderAprilFool’sDayforexample.Nooneknowswhenorwhyitbegan.Todayitiscelebratedinmanycountries--FranceEnglandandAustraliaamongothers.Onthisdaypeopleplaypracticaljokes.______47Theoneswholaugharetheonesplayingthejokes.Thepeopletheyfooloftengetangry.DoescelebratingthisdaymakesensetoyouDyngusDayinPolandseemsstrangetoo.Onthisdayitistraditionalforboystopourwaterovertheheadsofgirls.Hereisthestrangestpart:Theydoittogirlstheylike.Otherunusualcelebrationstakeplaceinasinglecityortown.AholidaycalledLaTomatinaiscelebratedinBunolSpain.EveryyearinlateAugustbigtruckscarrymorethan200000poundsoftomatoesintothislittletown.______48Fortwohourspeopleinthestreetsthrowtomatoesateachother.Everyoneendsupredfromheadtotoe.August10marksthestartofthePuckFairanIrishfestivalwithaveryunusualtraditionPeoplefromthetownofKillorglingoupintothemountainsandcatchawildgoat.______49Therearealsosomecelebrationsthatarereallystrange.IntheUnitedStatessometimesonepersongetsanideaforanewholidayandtriestogetotherstoacceptit.WhoseideawasPublicSleepingDayThatoneisonFebruary28.ItmayseemstrangebutitsoundslikemorefunthantheoneonFebruary9.______50DoyouliketheideaofinventinganewholidayIfyoudothenyouwillwanttomarkMarch26onyourcalendar.ThatisMakeUpYourOwnHolidayDay.A.Someofthedayspeoplecelebratehoweverarelessserious.B.Jokesaresupposedtobefunnybutthesejokesdonotmakeeveryonelaugh.C.Somepeoplehavefunimaginingnewholidays.D.Theybringhimbacktotownputacrownonhisheadandmakehimkingforthreedays.E.Thenbeginstheworld’sbiggestfoodfight.F.ThatissupposedtobeToothacheDay.
WhatIstheCoolestGasintheUniverse’.WhatisthecoldestairtemperatureeverrecordedontheEarthWherewasthislowtemperaturerecordedThecoldestrecordedtemperatureonEarthwas--91℃.which51inAntarctica南极洲in1983.Weencounteraninterestingsituationwhenwediscusstemperaturesin52.TemperaturesinEarthorbit轨道actuallyrangefromabout+120℃to--120℃.Thetemperaturedependsupon53youareindirectsunlightorshade.Obviously-120℃iscolderthanourbodycan54endure.Thespacetemperaturesjustdiscussedaffectonlyourareaofthesolar55.ObviouslyitishotterclosertotheSunandcolderaswetravel56fromtheSun.ScientistsestimatetemperaturesatPlutoareabout--210℃.HowcoldisthelowestestimatedtemperatureintheentireuniverseAgainitdependsuponyour57.Wearetaughtitissupposedly58tohaveatemperaturebelowabsolutezerowhichis--273℃atwhichatomsdonotmove.TwoscientistsCornellandWiemanhavesuccessfully59downagastoatemperaturebarelyaboveabsolutezero.TheywonaNobelPrizeinPhysicsin2001fortheirwork--notadiscoveryinthiscase.Whyisthetwoscientists’worksoimportanttoscienceInthe1920sSatyendraNathBosewasstudyinganinteresting60aboutspeciallightparticles微粒wenowcallphotons光子.Bosehadtrouble61otherscientiststobelievehistheorysohecontactedAlbertEinstein.Einstein’scalculationshelpedhimtheorizethatatoms62behaveasBosethought--butonlyatverycoldtemperatures.Scientistshavealsodiscoveredthatultra-cold超冷atomscanhelpthemmaketheworld’satomicclockseven63accurate.Theseclocksaresoaccuratetodaytheywouldonlyloseonesecond64sixmillionyears!Suchaccuracywillhelpustravelinspacebecausedistanceisvelocity速度timestimed=v×tWiththelongdistancesinvolvedinspace65weneedtoknowtimeasaccuratelyaspossibletogetaccuratedistance.
WhatIstheCoolestGasintheUniverse’.WhatisthecoldestairtemperatureeverrecordedontheEarthWherewasthislowtemperaturerecordedThecoldestrecordedtemperatureonEarthwas--91℃.which51inAntarctica南极洲in1983.Weencounteraninterestingsituationwhenwediscusstemperaturesin52.TemperaturesinEarthorbit轨道actuallyrangefromabout+120℃to--120℃.Thetemperaturedependsupon53youareindirectsunlightorshade.Obviously-120℃iscolderthanourbodycan54endure.Thespacetemperaturesjustdiscussedaffectonlyourareaofthesolar55.ObviouslyitishotterclosertotheSunandcolderaswetravel56fromtheSun.ScientistsestimatetemperaturesatPlutoareabout--210℃.HowcoldisthelowestestimatedtemperatureintheentireuniverseAgainitdependsuponyour57.Wearetaughtitissupposedly58tohaveatemperaturebelowabsolutezerowhichis--273℃atwhichatomsdonotmove.TwoscientistsCornellandWiemanhavesuccessfully59downagastoatemperaturebarelyaboveabsolutezero.TheywonaNobelPrizeinPhysicsin2001fortheirwork--notadiscoveryinthiscase.Whyisthetwoscientists’worksoimportanttoscienceInthe1920sSatyendraNathBosewasstudyinganinteresting60aboutspeciallightparticles微粒wenowcallphotons光子.Bosehadtrouble61otherscientiststobelievehistheorysohecontactedAlbertEinstein.Einstein’scalculationshelpedhimtheorizethatatoms62behaveasBosethought--butonlyatverycoldtemperatures.Scientistshavealsodiscoveredthatultra-cold超冷atomscanhelpthemmaketheworld’satomicclockseven63accurate.Theseclocksaresoaccuratetodaytheywouldonlyloseonesecond64sixmillionyears!Suchaccuracywillhelpustravelinspacebecausedistanceisvelocity速度timestimed=v×tWiththelongdistancesinvolvedinspace65weneedtoknowtimeasaccuratelyaspossibletogetaccuratedistance.
WeavingwithLightIntheSierraMadremountainrangeofwestcentralMexicothenativeHuicholpeoplelivemuchthewaytheirancestorsdid--Withoutelectricity.That’sbecauseit’stooexpensivetostringpowerlinestotheremotemountainareaswheretheylive.TohelpsupportthemselvestheHuicholcreatebeautifulartwork.Theyselltheirartincitieshundredsofmilesawayfromtheirvillages.Andwithoutelectricity--athomeorontheroadtheycanonlyworkduringdaylighthours.Whenitgetsdarktheymuststopwhateverthey’redoing.NowateamofscientistsdesignersandarchitectsisusingnewtechnologiestoprovidetheHuicholwithlightafterthesunsets.Thescientists’techniqueinvolvesweavingtinyelectroniccrystalsintofabricsthatcanbemadeintoclothesbagsorotheritems.Bycollectingthesun’senergyduringthedaytheselightweightfabricsprovidebrightwhitelightatnight.TheirinventorshavenamedthefabricsPortable轻便的Lights.PortableLightshavethepotentialtotransformthelivesofpeoplewithoutelectricityaroundtheworld.AtthecoreofPortableLightstechnologyaredevicescalledhigh-brightnesslight-emittingdiodes高亮度发光二极管orHBLEDs.Thesetinylightsappearindigitalclockstelevisionsandstreetlights.LEDsarecompletelydifferentfromthelightbulbs灯泡.Mostofthoseglassbulbsbelongtoatypecalledincandescentlights白炽灯.Insideelectricityheatsametalcoil线圈toabout2200degreesCelsius.Atthattemperaturebulbsgiveofflightwecansee.Ninetypercentofenergyproducedbyincandescentlightshoweverisheat--andinvisible.Withallthatwastedenergybulbsburnoutquickly.Theyarealsoeasilybroken.LEDsontheotherhandareliketinypiecesofrockmadeupofmolecules分子thatarearrangedinacrystalstructure.WhenanelectriccurrentpassesthroughanLEDthecrystalstructureproduceslight.Unlikeincandescentbulbstheycanproducelightofvariouscolors.WithinanLEDthetypeofmoleculesandtheirparticulararrangementdetermineswhatcolorisproduced.ThecentralpartofthePortableLightstechnologyis
第二篇Hurricane飓风Katrina Ahurricaneisafiercelypowerfulrotating旋转的formoftropicalstormthatcanbe124to1240milesindiameter.ThetermhurricaneisderivedfromHuricanthenameofanativeAmericanstormgod.Hurricanesaretypicalofacalmcentralregionoflowpressurebetween12to60milesindiameterknownastheeye.Theyoccurintropicalregions.Overitslifetimeoneofthesecanreleaseasmuchenergyas10000nuclearbombs. Theseedforhurricaneformationisacluster聚集ofthunderstomsoverwarmtropicalwaters.Hurricanescanonlyformandbefedwhenthesea-surfacetemperatureexceeds27℃andthesurroundingatmosphereiscalm.TheserequirementsaremetbetweenJuneandNovemberinthenorthernpartoftheworld. Undertheseconditionslargequantitiesofwaterevaporate蒸发andcondense冷凝intocloudsandrain-releasingheatintheprocess.ItisthisheatenergycombinedwiththerotationoftheEarththatdrivesahurricane. Whenthewarmcolumnofairfromtheseasurfacefirstbeginstoriseitcausesanareaoflowpressure.Thisinturncreateswindasairisdrawnintothearea.Thisspinningwinddragsupmoremoistairfromtheseasurfaceinaprocessthatstrengthensthestorm.Coldairfallsbacktotheoceansurfacethroughtheeyeandontheoutsideofthestorm. Initiallywhenwindspeedsreach23milesperhourthesemildwetandgreyweathersystemsareknownasdepressionsorlowairpressure.HurricaneKatrinaformedinthiswayoverthesouth-easternBahamason23August2005.KatrinahashadadevastatingimpactontheGulfCoastoftheUSleavingadisasterzoneof90000squaremilesinitswake尾迹-almostthesizeoftheUK.Thousandshavebeenkilledorinjuredandmorethanhalfamillionpeoplehavebecomehomelessinahumanitarian人道主义的crisisofascalenotseenintheUSsincetheGreatDepression.Thecostofthedamagemaytop$100billion. Whenthewarmairfromtheseasurfacebeginstoriseit
WhatIstheCoolestGasintheUniverse’.WhatisthecoldestairtemperatureeverrecordedontheEarthWherewasthislowtemperaturerecordedThecoldestrecordedtemperatureonEarthwas--91℃.which51inAntarctica南极洲in1983.Weencounteraninterestingsituationwhenwediscusstemperaturesin52.TemperaturesinEarthorbit轨道actuallyrangefromabout+120℃to--120℃.Thetemperaturedependsupon53youareindirectsunlightorshade.Obviously-120℃iscolderthanourbodycan54endure.Thespacetemperaturesjustdiscussedaffectonlyourareaofthesolar55.ObviouslyitishotterclosertotheSunandcolderaswetravel56fromtheSun.ScientistsestimatetemperaturesatPlutoareabout--210℃.HowcoldisthelowestestimatedtemperatureintheentireuniverseAgainitdependsuponyour57.Wearetaughtitissupposedly58tohaveatemperaturebelowabsolutezerowhichis--273℃atwhichatomsdonotmove.TwoscientistsCornellandWiemanhavesuccessfully59downagastoatemperaturebarelyaboveabsolutezero.TheywonaNobelPrizeinPhysicsin2001fortheirwork--notadiscoveryinthiscase.Whyisthetwoscientists’worksoimportanttoscienceInthe1920sSatyendraNathBosewasstudyinganinteresting60aboutspeciallightparticles微粒wenowcallphotons光子.Bosehadtrouble61otherscientiststobelievehistheorysohecontactedAlbertEinstein.Einstein’scalculationshelpedhimtheorizethatatoms62behaveasBosethought--butonlyatverycoldtemperatures.Scientistshavealsodiscoveredthatultra-cold超冷atomscanhelpthemmaketheworld’satomicclockseven63accurate.Theseclocksaresoaccuratetodaytheywouldonlyloseonesecond64sixmillionyears!Suchaccuracywillhelpustravelinspacebecausedistanceisvelocity速度timestimed=v×tWiththelongdistancesinvolvedinspace65weneedtoknowtimeasaccuratelyaspossibletogetaccuratedistance.
Theirstyleofplayingfootballis{{U}}utterly{{/U}}different.
BlackHoles Mostscientistsagreethatblackholesexistbutarenearlyimpossibletolocate.Ablackholeintheuniverseisnotasolidobjectlikeaplanetbutitisshapedlikeasphere球体.Astronomers天文学家thinkthatatthecenterofablackholethereisasinglepointinspacewithinfinite无限的density稠密.Thissinglepointiscalledasingularity奇点.Ifthesingularitytheoryiscorrectitmeansthatwhenamassivestarcollapsesallthematerialinitdisappearsintothesingularity.Thecenterofablackholewouldnotreallybeaholeatallbutaninfinitelydensepoint.Anythingthatcrossestheblackholeispulledinbyitsgreatgravity. Althoughblackholesdoexisttheyaredifficulttoobserve.Thesearethereasons. ●Nolightoranythingelsecomesoutofblackholes.Asaresulttheyareinvisibletoatelescope. ●Inastronomicaltermsblackholesaretruly.Forexampleablackholeformedbythecollapseofagiantstarwouldhaveaneventhorizon视界only18milesacross. ●ThenearestblackholeswouldbedozensoflightyearsawayfromEarth.Onelightyearisabout6trillion万亿miles.Eventhemostpowerfultelescopescouldnotpickoutanobjectsosmallatsuchagreatdistance. In1994theHubbleSpaceTelescopeprovidedevidencethatblackholesexist.Therearestillanswerstobefoundhoweversoblackholesremainoneofthemysteriesoftheuniverse. Thesunistheheavieststarintheuniverse.
WeavingwithLightIntheSierraMadremountainrangeofwestcentralMexicothenativeHuicholpeoplelivemuchthewaytheirancestorsdid--Withoutelectricity.That’sbecauseit’stooexpensivetostringpowerlinestotheremotemountainareaswheretheylive.TohelpsupportthemselvestheHuicholcreatebeautifulartwork.Theyselltheirartincitieshundredsofmilesawayfromtheirvillages.Andwithoutelectricity--athomeorontheroadtheycanonlyworkduringdaylighthours.Whenitgetsdarktheymuststopwhateverthey’redoing.NowateamofscientistsdesignersandarchitectsisusingnewtechnologiestoprovidetheHuicholwithlightafterthesunsets.Thescientists’techniqueinvolvesweavingtinyelectroniccrystalsintofabricsthatcanbemadeintoclothesbagsorotheritems.Bycollectingthesun’senergyduringthedaytheselightweightfabricsprovidebrightwhitelightatnight.TheirinventorshavenamedthefabricsPortable轻便的Lights.PortableLightshavethepotentialtotransformthelivesofpeoplewithoutelectricityaroundtheworld.AtthecoreofPortableLightstechnologyaredevicescalledhigh-brightnesslight-emittingdiodes高亮度发光二极管orHBLEDs.Thesetinylightsappearindigitalclockstelevisionsandstreetlights.LEDsarecompletelydifferentfromthelightbulbs灯泡.Mostofthoseglassbulbsbelongtoatypecalledincandescentlights白炽灯.Insideelectricityheatsametalcoil线圈toabout2200degreesCelsius.Atthattemperaturebulbsgiveofflightwecansee.Ninetypercentofenergyproducedbyincandescentlightshoweverisheat--andinvisible.Withallthatwastedenergybulbsburnoutquickly.Theyarealsoeasilybroken.LEDsontheotherhandareliketinypiecesofrockmadeupofmolecules分子thatarearrangedinacrystalstructure.WhenanelectriccurrentpassesthroughanLEDthecrystalstructureproduceslight.Unlikeincandescentbulbstheycanproducelightofvariouscolors.WithinanLEDthetypeofmoleculesandtheirparticulararrangementdetermineswhatcolorisproduced.LEDsaredifferentfromlightbulbsinthat
第一篇RenewableEnergySources Todaypetroleum石油providesaround40%oftheworld’senergyneedsmostlyfuellingautomobiles.Coalisstillusedmostlyinpowerstationstocoverone-quarterofourenergyneedsbutitistheleastefficientunhealthiestandmostenvironmentallydamagingfossilfuel矿物燃料.Naturalgasreservescouldfillsomeofthegapfromoilbutreservesofthatwillnotlastintothe22ndcenturyeither.Mostexpertspredictwewillexhausteasilyaccessiblereserveswithin50years.Less-pollutingrenewableenergysourcesofferamorepracticallong-termenergysolution.Renewablereferstothefactthattheseresourcesarenotusedfasterthantheycanbereplaced. Hydroelectric水力发电的powerisnowthemostcommonformofrenewableenergysupplyingaround20%ofworldelectricity.China’sThreeGorgesDamisthelargestever.AtfivetimesthesizeoftheUS’sHooverDamits26turbines涡轮机willgeneratetheequivalentenergyof18coal-firedpowerstations.Itwillsatisfy3%ofChina’sentireelectricitydemand. In2003thefirstcommercialpowerstationtousetidal潮汐的currentsintheopenseaopenedinNorway.Itisdesignedlikewindmill风车butotherstaketheformofturbines. Aspricesfallwindpowerhasbecomethefastestgrowingtypeofelectricitygeneration-quadrupling翻两番worldwidebetween1999and2005.Modernwindfarmsconsistofturbinesthatgenerateelectricity.Thoughitwillbemoreexpensivethereismorethanenoughwindtoprovidetheworld’sentireenergyneeds.Windfarmscomeinonshoreandoffshoreforms.Theycanoftenendupatspotsofnaturalbeautyandareoftenunpopularwithresidents.Andturbinesarenottotallyharmless-theycaninterferewithradaralterclimateandkillseabirds.ScotlandisbuildingEurope’slargestwindfarmwhichwillpower200000homes.TheUK’sgoalistogenerateone-fifthofpowerfromrenewablesourcesmainlywindby2020.Butthismaycauseproblemsbecausewindisunreliable. Oneoftheproblemswithwindfarmsisthat
WhatIstheCoolestGasintheUniverse’.WhatisthecoldestairtemperatureeverrecordedontheEarthWherewasthislowtemperaturerecordedThecoldestrecordedtemperatureonEarthwas--91℃.which51inAntarctica南极洲in1983.Weencounteraninterestingsituationwhenwediscusstemperaturesin52.TemperaturesinEarthorbit轨道actuallyrangefromabout+120℃to--120℃.Thetemperaturedependsupon53youareindirectsunlightorshade.Obviously-120℃iscolderthanourbodycan54endure.Thespacetemperaturesjustdiscussedaffectonlyourareaofthesolar55.ObviouslyitishotterclosertotheSunandcolderaswetravel56fromtheSun.ScientistsestimatetemperaturesatPlutoareabout--210℃.HowcoldisthelowestestimatedtemperatureintheentireuniverseAgainitdependsuponyour57.Wearetaughtitissupposedly58tohaveatemperaturebelowabsolutezerowhichis--273℃atwhichatomsdonotmove.TwoscientistsCornellandWiemanhavesuccessfully59downagastoatemperaturebarelyaboveabsolutezero.TheywonaNobelPrizeinPhysicsin2001fortheirwork--notadiscoveryinthiscase.Whyisthetwoscientists’worksoimportanttoscienceInthe1920sSatyendraNathBosewasstudyinganinteresting60aboutspeciallightparticles微粒wenowcallphotons光子.Bosehadtrouble61otherscientiststobelievehistheorysohecontactedAlbertEinstein.Einstein’scalculationshelpedhimtheorizethatatoms62behaveasBosethought--butonlyatverycoldtemperatures.Scientistshavealsodiscoveredthatultra-cold超冷atomscanhelpthemmaketheworld’satomicclockseven63accurate.Theseclocksaresoaccuratetodaytheywouldonlyloseonesecond64sixmillionyears!Suchaccuracywillhelpustravelinspacebecausedistanceisvelocity速度timestimed=v×tWiththelongdistancesinvolvedinspace65weneedtoknowtimeasaccuratelyaspossibletogetaccuratedistance.
WhatIstheCoolestGasintheUniverse’.WhatisthecoldestairtemperatureeverrecordedontheEarthWherewasthislowtemperaturerecordedThecoldestrecordedtemperatureonEarthwas--91℃.which51inAntarctica南极洲in1983.Weencounteraninterestingsituationwhenwediscusstemperaturesin52.TemperaturesinEarthorbit轨道actuallyrangefromabout+120℃to--120℃.Thetemperaturedependsupon53youareindirectsunlightorshade.Obviously-120℃iscolderthanourbodycan54endure.Thespacetemperaturesjustdiscussedaffectonlyourareaofthesolar55.ObviouslyitishotterclosertotheSunandcolderaswetravel56fromtheSun.ScientistsestimatetemperaturesatPlutoareabout--210℃.HowcoldisthelowestestimatedtemperatureintheentireuniverseAgainitdependsuponyour57.Wearetaughtitissupposedly58tohaveatemperaturebelowabsolutezerowhichis--273℃atwhichatomsdonotmove.TwoscientistsCornellandWiemanhavesuccessfully59downagastoatemperaturebarelyaboveabsolutezero.TheywonaNobelPrizeinPhysicsin2001fortheirwork--notadiscoveryinthiscase.Whyisthetwoscientists’worksoimportanttoscienceInthe1920sSatyendraNathBosewasstudyinganinteresting60aboutspeciallightparticles微粒wenowcallphotons光子.Bosehadtrouble61otherscientiststobelievehistheorysohecontactedAlbertEinstein.Einstein’scalculationshelpedhimtheorizethatatoms62behaveasBosethought--butonlyatverycoldtemperatures.Scientistshavealsodiscoveredthatultra-cold超冷atomscanhelpthemmaketheworld’satomicclockseven63accurate.Theseclocksaresoaccuratetodaytheywouldonlyloseonesecond64sixmillionyears!Suchaccuracywillhelpustravelinspacebecausedistanceisvelocity速度timestimed=v×tWiththelongdistancesinvolvedinspace65weneedtoknowtimeasaccuratelyaspossibletogetaccuratedistance.
Thearticle{{U}}sketched{{/U}}themajoreventsofthedecade.
第三篇TryingtoFindaParther OneofthemoststrikingfindingsofarecentpollintheUKisthatofthepeopleinbterviewedoneintwobelievesthatitisbecomingmoredifficulttomeetsomeonetostartafamilywith. Whyaremanyfindingitincreasinglydifficulttostartandsustainintimaterelationships?Doesmodernlifereallymakeithardertofallinlove?Orarewemakingitharderforourselves? Itiscertainlythecasetodaythatcontemporarycouplesbenefitindifferentwaysfromrelationships.Womennolongerrelyuponpartnersforeconomicsecurityorstatus.Amandoesn’texpecthisspousetobeinsolechargeofrunninghishouseholdandraisinghischildren. Butperhapstheknowledgethatwecanliveperfectlywellwithoutapartnershipmeansthatittakesmuchmoretopersuadepeopletoabandontheirindependence. Intheoryfindingapartnershouldbemuchsimplerthesedays.Onlyafewgenerationsagoyourchoiceofsoulmate心上人wasconstrained限制bygeographysocialconventionandfamilytradition.Althoughitwasneverexplicitmanymarriageswereessentiallyarranged. Nowthosebarriershavebeenbrokendown.Youcanapproachabuilderorabrainsurgeoninanybarinanycityonanygivenevening.Whentheworldisyouroyster牡蛎yousurelyhaveabetterchanceoffindingapearl. Butitseemsthattheoldconventionshavebeenreplacedbyaneventighterconstraint:thetyrannyofchoice. Theexpectationsofpartnersareinflated提高toanunmanageabledegree:goodlooksimpressivesalarykindtograndmotherandrightsocks.Thereisnoroomforerrorinthefirstimpression. Wethinkthatarelationshipcanbeperfect.Ifitisn’titisdisposable.Weworktoprotectourselvesagainstfutureheartacheanddon’tputinthehardemotionallaborneededtobuildastrongrelationship.Ofcoursethisiscomplicatedbyrealities.Thecostofhousingandchild-rearingcreatespressuretohaveastableincomeandcareerbeforealifepartnership. WhichofthefollowingisNOTtrueaboutacontemporarymarriedcouple?
Thesearedefensivebehaviorpatternswhich{{U}}derive{{/U}}fromourfears.
BlackHoles Mostscientistsagreethatblackholesexistbutarenearlyimpossibletolocate.Ablackholeintheuniverseisnotasolidobjectlikeaplanetbutitisshapedlikeasphere球体.Astronomers天文学家thinkthatatthecenterofablackholethereisasinglepointinspacewithinfinite无限的density稠密.Thissinglepointiscalledasingularity奇点.Ifthesingularitytheoryiscorrectitmeansthatwhenamassivestarcollapsesallthematerialinitdisappearsintothesingularity.Thecenterofablackholewouldnotreallybeaholeatallbutaninfinitelydensepoint.Anythingthatcrossestheblackholeispulledinbyitsgreatgravity. Althoughblackholesdoexisttheyaredifficulttoobserve.Thesearethereasons. ●Nolightoranythingelsecomesoutofblackholes.Asaresulttheyareinvisibletoatelescope. ●Inastronomicaltermsblackholesaretruly.Forexampleablackholeformedbythecollapseofagiantstarwouldhaveaneventhorizon视界only18milesacross. ●ThenearestblackholeswouldbedozensoflightyearsawayfromEarth.Onelightyearisabout6trillion万亿miles.Eventhemostpowerfultelescopescouldnotpickoutanobjectsosmallatsuchagreatdistance. In1994theHubbleSpaceTelescopeprovidedevidencethatblackholesexist.Therearestillanswerstobefoundhoweversoblackholesremainoneofthemysteriesoftheuniverse. Blackholesarepartofspace.
Reliefworkerswere{{U}}shocked{{/U}}bywhattheysaw.
Thisisnot{{U}}typical{{/U}}ofEnglishbutisafeatureoftheChineselanguage.
WhatIstheCoolestGasintheUniverse’.WhatisthecoldestairtemperatureeverrecordedontheEarthWherewasthislowtemperaturerecordedThecoldestrecordedtemperatureonEarthwas--91℃.which51inAntarctica南极洲in1983.Weencounteraninterestingsituationwhenwediscusstemperaturesin52.TemperaturesinEarthorbit轨道actuallyrangefromabout+120℃to--120℃.Thetemperaturedependsupon53youareindirectsunlightorshade.Obviously-120℃iscolderthanourbodycan54endure.Thespacetemperaturesjustdiscussedaffectonlyourareaofthesolar55.ObviouslyitishotterclosertotheSunandcolderaswetravel56fromtheSun.ScientistsestimatetemperaturesatPlutoareabout--210℃.HowcoldisthelowestestimatedtemperatureintheentireuniverseAgainitdependsuponyour57.Wearetaughtitissupposedly58tohaveatemperaturebelowabsolutezerowhichis--273℃atwhichatomsdonotmove.TwoscientistsCornellandWiemanhavesuccessfully59downagastoatemperaturebarelyaboveabsolutezero.TheywonaNobelPrizeinPhysicsin2001fortheirwork--notadiscoveryinthiscase.Whyisthetwoscientists’worksoimportanttoscienceInthe1920sSatyendraNathBosewasstudyinganinteresting60aboutspeciallightparticles微粒wenowcallphotons光子.Bosehadtrouble61otherscientiststobelievehistheorysohecontactedAlbertEinstein.Einstein’scalculationshelpedhimtheorizethatatoms62behaveasBosethought--butonlyatverycoldtemperatures.Scientistshavealsodiscoveredthatultra-cold超冷atomscanhelpthemmaketheworld’satomicclockseven63accurate.Theseclocksaresoaccuratetodaytheywouldonlyloseonesecond64sixmillionyears!Suchaccuracywillhelpustravelinspacebecausedistanceisvelocity速度timestimed=v×tWiththelongdistancesinvolvedinspace65weneedtoknowtimeasaccuratelyaspossibletogetaccuratedistance.
WhatIstheCoolestGasintheUniverse’.WhatisthecoldestairtemperatureeverrecordedontheEarthWherewasthislowtemperaturerecordedThecoldestrecordedtemperatureonEarthwas--91℃.which51inAntarctica南极洲in1983.Weencounteraninterestingsituationwhenwediscusstemperaturesin52.TemperaturesinEarthorbit轨道actuallyrangefromabout+120℃to--120℃.Thetemperaturedependsupon53youareindirectsunlightorshade.Obviously-120℃iscolderthanourbodycan54endure.Thespacetemperaturesjustdiscussedaffectonlyourareaofthesolar55.ObviouslyitishotterclosertotheSunandcolderaswetravel56fromtheSun.ScientistsestimatetemperaturesatPlutoareabout--210℃.HowcoldisthelowestestimatedtemperatureintheentireuniverseAgainitdependsuponyour57.Wearetaughtitissupposedly58tohaveatemperaturebelowabsolutezerowhichis--273℃atwhichatomsdonotmove.TwoscientistsCornellandWiemanhavesuccessfully59downagastoatemperaturebarelyaboveabsolutezero.TheywonaNobelPrizeinPhysicsin2001fortheirwork--notadiscoveryinthiscase.Whyisthetwoscientists’worksoimportanttoscienceInthe1920sSatyendraNathBosewasstudyinganinteresting60aboutspeciallightparticles微粒wenowcallphotons光子.Bosehadtrouble61otherscientiststobelievehistheorysohecontactedAlbertEinstein.Einstein’scalculationshelpedhimtheorizethatatoms62behaveasBosethought--butonlyatverycoldtemperatures.Scientistshavealsodiscoveredthatultra-cold超冷atomscanhelpthemmaketheworld’satomicclockseven63accurate.Theseclocksaresoaccuratetodaytheywouldonlyloseonesecond64sixmillionyears!Suchaccuracywillhelpustravelinspacebecausedistanceisvelocity速度timestimed=v×tWiththelongdistancesinvolvedinspace65weneedtoknowtimeasaccuratelyaspossibletogetaccuratedistance.
Theyhavethe{{U}}capability{{/U}}todestroytheenemyinafewdays.
第一篇RenewableEnergySources Todaypetroleum石油providesaround40%oftheworld’senergyneedsmostlyfuellingautomobiles.Coalisstillusedmostlyinpowerstationstocoverone-quarterofourenergyneedsbutitistheleastefficientunhealthiestandmostenvironmentallydamagingfossilfuel矿物燃料.Naturalgasreservescouldfillsomeofthegapfromoilbutreservesofthatwillnotlastintothe22ndcenturyeither.Mostexpertspredictwewillexhausteasilyaccessiblereserveswithin50years.Less-pollutingrenewableenergysourcesofferamorepracticallong-termenergysolution.Renewablereferstothefactthattheseresourcesarenotusedfasterthantheycanbereplaced. Hydroelectric水力发电的powerisnowthemostcommonformofrenewableenergysupplyingaround20%ofworldelectricity.China’sThreeGorgesDamisthelargestever.AtfivetimesthesizeoftheUS’sHooverDamits26turbines涡轮机willgeneratetheequivalentenergyof18coal-firedpowerstations.Itwillsatisfy3%ofChina’sentireelectricitydemand. In2003thefirstcommercialpowerstationtousetidal潮汐的currentsintheopenseaopenedinNorway.Itisdesignedlikewindmill风车butotherstaketheformofturbines. Aspricesfallwindpowerhasbecomethefastestgrowingtypeofelectricitygeneration-quadrupling翻两番worldwidebetween1999and2005.Modernwindfarmsconsistofturbinesthatgenerateelectricity.Thoughitwillbemoreexpensivethereismorethanenoughwindtoprovidetheworld’sentireenergyneeds.Windfarmscomeinonshoreandoffshoreforms.Theycanoftenendupatspotsofnaturalbeautyandareoftenunpopularwithresidents.Andturbinesarenottotallyharmless-theycaninterferewithradaralterclimateandkillseabirds.ScotlandisbuildingEurope’slargestwindfarmwhichwillpower200000homes.TheUK’sgoalistogenerateone-fifthofpowerfromrenewablesourcesmainlywindby2020.Butthismaycauseproblemsbecausewindisunreliable. China’sThreeGorgesDam
WeavingwithLightIntheSierraMadremountainrangeofwestcentralMexicothenativeHuicholpeoplelivemuchthewaytheirancestorsdid--Withoutelectricity.That’sbecauseit’stooexpensivetostringpowerlinestotheremotemountainareaswheretheylive.TohelpsupportthemselvestheHuicholcreatebeautifulartwork.Theyselltheirartincitieshundredsofmilesawayfromtheirvillages.Andwithoutelectricity--athomeorontheroadtheycanonlyworkduringdaylighthours.Whenitgetsdarktheymuststopwhateverthey’redoing.NowateamofscientistsdesignersandarchitectsisusingnewtechnologiestoprovidetheHuicholwithlightafterthesunsets.Thescientists’techniqueinvolvesweavingtinyelectroniccrystalsintofabricsthatcanbemadeintoclothesbagsorotheritems.Bycollectingthesun’senergyduringthedaytheselightweightfabricsprovidebrightwhitelightatnight.TheirinventorshavenamedthefabricsPortable轻便的Lights.PortableLightshavethepotentialtotransformthelivesofpeoplewithoutelectricityaroundtheworld.AtthecoreofPortableLightstechnologyaredevicescalledhigh-brightnesslight-emittingdiodes高亮度发光二极管orHBLEDs.Thesetinylightsappearindigitalclockstelevisionsandstreetlights.LEDsarecompletelydifferentfromthelightbulbs灯泡.Mostofthoseglassbulbsbelongtoatypecalledincandescentlights白炽灯.Insideelectricityheatsametalcoil线圈toabout2200degreesCelsius.Atthattemperaturebulbsgiveofflightwecansee.Ninetypercentofenergyproducedbyincandescentlightshoweverisheat--andinvisible.Withallthatwastedenergybulbsburnoutquickly.Theyarealsoeasilybroken.LEDsontheotherhandareliketinypiecesofrockmadeupofmolecules分子thatarearrangedinacrystalstructure.WhenanelectriccurrentpassesthroughanLEDthecrystalstructureproduceslight.Unlikeincandescentbulbstheycanproducelightofvariouscolors.WithinanLEDthetypeofmoleculesandtheirparticulararrangementdetermineswhatcolorisproduced.TheHuicholdon’tuseelectricitybecause
WhatIstheCoolestGasintheUniverse’.WhatisthecoldestairtemperatureeverrecordedontheEarthWherewasthislowtemperaturerecordedThecoldestrecordedtemperatureonEarthwas--91℃.which51inAntarctica南极洲in1983.Weencounteraninterestingsituationwhenwediscusstemperaturesin52.TemperaturesinEarthorbit轨道actuallyrangefromabout+120℃to--120℃.Thetemperaturedependsupon53youareindirectsunlightorshade.Obviously-120℃iscolderthanourbodycan54endure.Thespacetemperaturesjustdiscussedaffectonlyourareaofthesolar55.ObviouslyitishotterclosertotheSunandcolderaswetravel56fromtheSun.ScientistsestimatetemperaturesatPlutoareabout--210℃.HowcoldisthelowestestimatedtemperatureintheentireuniverseAgainitdependsuponyour57.Wearetaughtitissupposedly58tohaveatemperaturebelowabsolutezerowhichis--273℃atwhichatomsdonotmove.TwoscientistsCornellandWiemanhavesuccessfully59downagastoatemperaturebarelyaboveabsolutezero.TheywonaNobelPrizeinPhysicsin2001fortheirwork--notadiscoveryinthiscase.Whyisthetwoscientists’worksoimportanttoscienceInthe1920sSatyendraNathBosewasstudyinganinteresting60aboutspeciallightparticles微粒wenowcallphotons光子.Bosehadtrouble61otherscientiststobelievehistheorysohecontactedAlbertEinstein.Einstein’scalculationshelpedhimtheorizethatatoms62behaveasBosethought--butonlyatverycoldtemperatures.Scientistshavealsodiscoveredthatultra-cold超冷atomscanhelpthemmaketheworld’satomicclockseven63accurate.Theseclocksaresoaccuratetodaytheywouldonlyloseonesecond64sixmillionyears!Suchaccuracywillhelpustravelinspacebecausedistanceisvelocity速度timestimed=v×tWiththelongdistancesinvolvedinspace65weneedtoknowtimeasaccuratelyaspossibletogetaccuratedistance.
BlackHoles Mostscientistsagreethatblackholesexistbutarenearlyimpossibletolocate.Ablackholeintheuniverseisnotasolidobjectlikeaplanetbutitisshapedlikeasphere球体.Astronomers天文学家thinkthatatthecenterofablackholethereisasinglepointinspacewithinfinite无限的density稠密.Thissinglepointiscalledasingularity奇点.Ifthesingularitytheoryiscorrectitmeansthatwhenamassivestarcollapsesallthematerialinitdisappearsintothesingularity.Thecenterofablackholewouldnotreallybeaholeatallbutaninfinitelydensepoint.Anythingthatcrossestheblackholeispulledinbyitsgreatgravity. Althoughblackholesdoexisttheyaredifficulttoobserve.Thesearethereasons. ●Nolightoranythingelsecomesoutofblackholes.Asaresulttheyareinvisibletoatelescope. ●Inastronomicaltermsblackholesaretruly.Forexampleablackholeformedbythecollapseofagiantstarwouldhaveaneventhorizon视界only18milesacross. ●ThenearestblackholeswouldbedozensoflightyearsawayfromEarth.Onelightyearisabout6trillion万亿miles.Eventhemostpowerfultelescopescouldnotpickoutanobjectsosmallatsuchagreatdistance. In1994theHubbleSpaceTelescopeprovidedevidencethatblackholesexist.Therearestillanswerstobefoundhoweversoblackholesremainoneofthemysteriesoftheuniverse. TheHubbleSpaceTelescopehelpsscientiststounderstandthenatureoftheuniverse.
第二篇Hurricane飓风Katrina Ahurricaneisafiercelypowerfulrotating旋转的formoftropicalstormthatcanbe124to1240milesindiameter.ThetermhurricaneisderivedfromHuricanthenameofanativeAmericanstormgod.Hurricanesaretypicalofacalmcentralregionoflowpressurebetween12to60milesindiameterknownastheeye.Theyoccurintropicalregions.Overitslifetimeoneofthesecanreleaseasmuchenergyas10000nuclearbombs. Theseedforhurricaneformationisacluster聚集ofthunderstomsoverwarmtropicalwaters.Hurricanescanonlyformandbefedwhenthesea-surfacetemperatureexceeds27℃andthesurroundingatmosphereiscalm.TheserequirementsaremetbetweenJuneandNovemberinthenorthernpartoftheworld. Undertheseconditionslargequantitiesofwaterevaporate蒸发andcondense冷凝intocloudsandrain-releasingheatintheprocess.ItisthisheatenergycombinedwiththerotationoftheEarththatdrivesahurricane. Whenthewarmcolumnofairfromtheseasurfacefirstbeginstoriseitcausesanareaoflowpressure.Thisinturncreateswindasairisdrawnintothearea.Thisspinningwinddragsupmoremoistairfromtheseasurfaceinaprocessthatstrengthensthestorm.Coldairfallsbacktotheoceansurfacethroughtheeyeandontheoutsideofthestorm. Initiallywhenwindspeedsreach23milesperhourthesemildwetandgreyweathersystemsareknownasdepressionsorlowairpressure.HurricaneKatrinaformedinthiswayoverthesouth-easternBahamason23August2005.KatrinahashadadevastatingimpactontheGulfCoastoftheUSleavingadisasterzoneof90000squaremilesinitswake尾迹-almostthesizeoftheUK.Thousandshavebeenkilledorinjuredandmorethanhalfamillionpeoplehavebecomehomelessinahumanitarian人道主义的crisisofascalenotseenintheUSsincetheGreatDepression.Thecostofthedamagemaytop$100billion. WhichofthefollowingisNOTtrueofHurricaneKatrinaaccordingtothelastparagraph?
Theleaveshavebeensweptintohuge{{U}}heaps{{/U}}.
SomeUnusualCelebrationsSomeholidaysarewell-knownallaroundtheworld.AmongthemareNewYear’sEvecelebrations.AlsocommonaredaysinhonorofloveandfriendshiplikeValentine’sDay.EachcountryhasitsownspecialholidaystoooftentomarkimportanteventsinItshistory.Schoolsbanksandgovernmentofficesallcloseondayslikethese.______46Afewofthemarereallyverystrange.Ofcoursetheyarenotstrangetothepeoplewhocelebratethem.Perhapsthatisbecausethecelebrationshavelongtraditions.ConsiderAprilFool’sDayforexample.Nooneknowswhenorwhyitbegan.Todayitiscelebratedinmanycountries--FranceEnglandandAustraliaamongothers.Onthisdaypeopleplaypracticaljokes.______47Theoneswholaugharetheonesplayingthejokes.Thepeopletheyfooloftengetangry.DoescelebratingthisdaymakesensetoyouDyngusDayinPolandseemsstrangetoo.Onthisdayitistraditionalforboystopourwaterovertheheadsofgirls.Hereisthestrangestpart:Theydoittogirlstheylike.Otherunusualcelebrationstakeplaceinasinglecityortown.AholidaycalledLaTomatinaiscelebratedinBunolSpain.EveryyearinlateAugustbigtruckscarrymorethan200000poundsoftomatoesintothislittletown.______48Fortwohourspeopleinthestreetsthrowtomatoesateachother.Everyoneendsupredfromheadtotoe.August10marksthestartofthePuckFairanIrishfestivalwithaveryunusualtraditionPeoplefromthetownofKillorglingoupintothemountainsandcatchawildgoat.______49Therearealsosomecelebrationsthatarereallystrange.IntheUnitedStatessometimesonepersongetsanideaforanewholidayandtriestogetotherstoacceptit.WhoseideawasPublicSleepingDayThatoneisonFebruary28.ItmayseemstrangebutitsoundslikemorefunthantheoneonFebruary9.______50DoyouliketheideaofinventinganewholidayIfyoudothenyouwillwanttomarkMarch26onyourcalendar.ThatisMakeUpYourOwnHolidayDay.A.Someofthedayspeoplecelebratehoweverarelessserious.B.Jokesaresupposedtobefunnybutthesejokesdonotmakeeveryonelaugh.C.Somepeoplehavefunimaginingnewholidays.D.Theybringhimbacktotownputacrownonhisheadandmakehimkingforthreedays.E.Thenbeginstheworld’sbiggestfoodfight.F.ThatissupposedtobeToothacheDay.
热门题库
更多
语文
中石油职称英语
理工类
卫生类
综合类
国际货运代理师
报关水平测试
报检员
物流员(四级)
助理物流师(三级)
物流师(二级)
高级物流师(一级)
物流案例分析
单证员基础理论与知识
单证员缮制与操作
国际货运代理理论与实务
湘公网安备 43130202000226号