2018年5月19日托福閱讀機經

1、2018年5月19日托福閱讀機經本文從網(wǎng)絡收集而來，上傳到平臺為了幫到更多的人，如果您需要使用本文檔，請點擊下載按鈕下載本文檔(有償下載)，另外祝您生活愉快，工作順利，萬事如意！需要考托福的同學對于機經都有一種信任感，那么大家應該如何進行托福機經的學習呢，下面和出國留學網(wǎng)小編一起來看看2019年5月19日托福閱讀機經。天文類SurfaceFluidsonWnusandEarth參考閱讀：Afluidisasubstance,suchasaliquidorgasinwhichthecomponentparticles(usuallymolecules)canmovepastoneanother.

2、Fluidsfloweasilyandconformtotheshapeoftheircontainers.Thegeologicprocessesrelatedtothemovementoffluidsonaplanet'ssurfacecancompletelyresurfaceaplanetmanytimes.TheseprocessesderivetheirenergyfromtheSunandthegravitationalforcesoftheplanetitself.Asthesefluidsinteractwithsurfacematerials,theymovepar

3、ticlesaboutorreactchemicallywiththemtomodifyorproducematerials.Onasolidplanetwithahydrosphereandanatmosphereonlyatinyfractionoftheplanetarymassflowsassurfacefluids.Yetthemovementsofthese本文為網(wǎng)絡收集精選范文、公文、論文、和其他應用文檔，如需本文，請下載fluidscandrasticallyalteraplanet.ConsiderVenusandEarth,bothterrestrialplanetswit

4、hatmosphere.VenusandEartharecommonlyregardedastwinplanetsbutnotidenticaltwins.Theyareaboutthesamesize,arecomposedofroughlythesamemixofmaterials,andmayhavebeencomparablyendowedattheirbeginningwithcarbondioxideandwater.However,thetwinsevolveddifferently,largelybecauseofdifferencesintheirdistancefromth

5、eSun.Withasignificantamountofinternalheat,Venusmaycontinuetobegeologicallyactivewithvolcanoes,rifting,andfolding.However,itlacksanysignofahydrologicsystem(watercirculationanddistribution):therearenostreamslakes,oceans,orglaciers.SpaceprobessuggestthatVenusmayhavestartedwithasmuchwaterasEarth,butitwa

6、sunabletokeepitswaterinliquidform.BecauseVenusreceivesmoreheatfromtheSun,waterreleasedfromtheinteriorevaporatedandrosetotheupperatmospherewheretheSunsultravioletraysbrokethemoleculesapart.MuchofthefreedhydrogenescapedintospaceandVenuslostitswater.Withoutwater,VenusbecamelessandlesslikeEarthandkeptan

7、atmospherefilledwithcarbondioxide.Thecarbondioxideactsasablanket,creatinganintensegreenhouseeffectanddrivingsurfacetemperatureshighenoughtomeltleadandtoprohibittheformationofcarbonateminerals.Volcanoescontinuallyventedmorecarbondioxideintotheatmosphere.OnEarth,liquidwaterremovescarbondioxidefromthea

8、tmosphereandcombinesitwithcalcium,fromrockweathering,toformcarbonatesedimentaryrocks.WithoutliquidwatertoremovecarbonfromtheatmospherethelevelofcarbondioxideintheatmosphereofVenusremainshigh.OriginoftheSolarSystemComets文化藝術類TheOriginsofWritingLivePerformanceTheOriginsofTheaterTheDevelopmentofPrintin

9、g地質類EarlyTheoriesofContinentalDriftAttemptsatDeterminingEarth'sAgeHowSoilisFormedEarth'sEnergyCycleThermalStratification環(huán)境類TheClimateofJapanTheRoleoftheOceaninControllingClimate經濟類EffectsoftheCommercialRevolutionSeventeenth-CenturyEuropeanEconomicGrowth考古類EnvironmentalImpactoftheAnasaziTheCo

10、llapseoftheMaysTheChacoPhenomenon科學類TheBirthofPhotographyEarlyAmericanPrintingIndustry農業(yè)類AgriculturalSocietyinEighteenth-CenturyBritishAmericaWaterManagementinEarlyAgriculture社會類PopulationGrowthinNineteenth-CenturyEuropeHuntingandtheSettingofInnerEurasia生物類ExtinctionsattheEndoftheCretaceousTheCambrianExplosionTheExtinctionoftheDinosaursHowAnimalsinRainForestsMakeThemselvesHeardSocialityinAnimalsDinosaursandParentalCareHabitatSelectionTemperatureRegulationinMarineOrganismsCellTheoryPoikilothermsForestSuccessionTheRoleofDiapauseTheIdentificati