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1、实用标准TheEarth'sAtmosphereUnlessit'srainingorthewindisblowing,wedon'tusuallypaymuchattentiontotheatmosphere,theblanketofairthatsurroundstheEarth.Yet,withouttheatmosphere,theEarthwouldbeadesolate(荒芜的)planetwithnosignsoflife!文案大全实用标准Theatmosphereplaysseveralrolesinhelpingtomakelifepossible.First,theatm
2、osphereprovidesthethreegasesnecessaryforlife:oxygen,nitrogen,andcarbondioxide.Allanimals,includingourselves,breatheoxygen.Nitrogenandcarbondioxidearebothneededforplantgrowth.Lessimportantatmosphericgasesincludeargon,neon,helium,andhydrogen.文案大全实用标准Second,theatmospherealsoprotectsusfrommostofthesun'
3、shigh-energyultravioletlightrays,whichareharmfultolife.AlthoughtheseraysareonlyasmallpartofthesunlightstrikingtheEarth,theyareknowntobeverydangerous.However,99percentofallultravioletraysareabsorbedbeforetheyreachtheEarth'ssurface.Theyareabsorbedbyanatmosphericgas,calledozone,atypeofoxygengas.Theozo
4、nelayersurrounds文案大全实用标准theEarthbutismuchthinnerovertheNorthandSouthPolesthanoverotherregionsoftheEarth.TheonepercentoftheultravioletlightintheatmospherethatdoesreachtheEarth'ssurfaceisknowntocausesunburnandisnowbelievedtoalsocauseskincancerinmanypeople.Becauseofthis,doctorsrecommendthatpeoplelimit
5、theamountoftimetheyspendindirectsunlightandwearasuntanlotion(文案大全实用标准防晒油)thatblockstheultravioletrayswhentheydosunbathe.Finally,theatmospheregeneratesalltypesofweathersuchasclearblueskiesandstorms.Itactsasahugeenergymachine,changingsunlightintootherformsofenergysuchasheatandwind.Aspartofthisrole,th
6、eatmosphereregulatesthetemperatureontheEarth'ssurface.Firstitallowsonly46percentofthesunlightstrikingittopassthroughandactually文案大全实用标准reachtheEarth'ssurface.Second,carbondioxidegasintheatmospherecontrolstheamountofwarmthontheEarth'ssurfacethatisallowedtoradiate(发散)backintospace.Bythesetwocontrolli
7、ngdevices,theatmosphereregulatestheEarth'ssurfacetemperature.文案大全实用标准Choosethebestanswerstothefollowingquestions.文案大全实用标准1.Whichofthefollowingistrueaccordingtothepassage?A.TheozonelayerismuchthickeroverNort
