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1、2013高考英语二轮（阅读理解）精品训练（03）及答案AgainstthesuppositionthanforestfiresinAlaska,CanadaandSiberiawarmtheclimate,scientistshavediscoveredthatcoolingmayoccurinareaswhereburnttreesallowmoresnowtomirrormoresunlightintospace.Thisfindingsuggeststhattakingstepstopreventnorthernforesttolimitthereleaseofgreenhouseg
2、asesmaywarmtheclimateinnorthernregions.Usuallylargefiresdestroyedforestsintheseareasoverthepastdecade.Scientistspredictthatwithclimatewarming,firesmayoccurmorefrequentlyovernextseveralcenturiesasresultofalongerfireseason.Sunlighttakeninbytheearthtendstocausewarming,whileheatmirroredbackintospacete
3、ndstocausecooling.Thisisthefirststudytoanalyzeallaspectsofhownorthernfiresinfluenceclimate.Earlierstudiesbyotherscientistshavesuggestedthatfireinnorthernregionsspeedupclimatewarmingbecausegreenhousegasesfromburningtreesandplantsarereleasedintotheatmosphereandthustrapheat.Scientistsfoundthatrightaf
4、terthefire,largeamountsofgreenhousegasesenteredtheatmosphereandcausedwarming.Ozone（臭氧）levelsincreased,andashfromthefirefellonfar-offseaice,darkeningthesurfaceandcausingmoreradiationfromthesuntobetakenin.Thefollowingspring,however,thelandwithintheareaofthefirewasbrighterthanbeforethefire,becausefew
5、ertreescoveredtheground.Snowonthegroundmirroredmoresunlightbackintospace,leadingtocooling.“Weneedtofindoutallpossiblewaystoreducethegrowthofgreenhousegasesintheatmosphere.”Scientiststrackedthechangeinamountofradiationenteringandleavingtheclimatesystemasaresultofthefire,andfoundameasurementcloselyr
6、elatedtotheglobalairtemperature.Typically,fireinnorthernregionsoccursinthesameareaevery80to150years.Scientists,however,foundthatwhenfireoccursmorefrequently,moreradiationislostfromtheearthandcoolingresults.Specifically,theydeterminedwhenfirereturns20yearsearlierthanpredicated,0.5wattspersquaremete
7、rofareaburnedaresoakedupbytheearthfromgreenhousegases,but0.9wattspersquaremeterwillbesentbackintospace.Theneteffect-10-iscooling.Wattsareusedtomeasuretherateatwhichenergyisgainedorlostfromtheearth.1.Accordingtoth
