【英语】阅读理解(科普环保)练习题含答案.pdf

【英语】阅读理解(科普环保)练习题含答案

一、高中英语阅读理解科普环保类
1．犇犇阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。
AgainstthesuppositionthatforestfiresinAlaska,CanadaandSiberiawarmtheclimate,
scientistshavediscoveredthatcoolingmayoccurinareaswhereburnttreesallowmoresnowto
mirrormoresunlightintospace.
Thisfindingsuggeststhattakingstepstopreventnorthernforesttolimitthereleaseof
greenhousegasesmaywarmtheclimateinnorthernregions.Usuallylargefiresdestroyedforests
intheseareasoverthepastdecade.Scientistspredictthatwithclimatewarming,firesmayoccur
morefrequentlyovernextseveralcenturiesasaresultofalongerfireseason.Sunlighttakenin
bytheearthtendstocausewarming,whileheatmirroredbackintospacetendstocausecooling.
Thisisthefirststudytoanalyzeallaspectsofhownorthernfiresinfluenceclimate.Earlier
studiesbyotherscientistshavesuggestedthatfireinnorthernregionsspeedupclimatewarming
becausegreenhousegasesfromburningtreesandplantsarereleasedintotheatmosphereand
thustrapheat.
Scientistsfoundthatrightafterthefire,largeamountsofgreenhousegasesenteredthe
atmosphereandcausedwarming.Ozone(臭氧)levelsincreased,andashfromthefirefellonfar-
offseaice,darkeningthesurfaceandcausingmoreradiationfromthesuntobetakenin.The
followingspring,however,thelandwithintheareaofthefirewasbrighterthanbeforethefire,
becausefewertreescoveredtheground.Snowonthegroundmirroredmoresunlightbackinto
space,leadingtocooling.
needtofindoutallpossiblewaystoreducethegrowthofgreenhousegasesinthe
Scientiststrackedthechangeinamountofradiationenteringandleavingthe
climatesystemasaresultofthefire,andfoundameasurementcloselyrelatedtotheglobalair
temperature.Typically,fireinnorthernregionsoccursinthesameareaevery80to150years.
Scientists,however,foundthatwhenfireoccursmorefrequently,moreradiationislostfromthe
earthandcoolingresults.Specifically,theydeterminedwhenfirereturns20yearsearlierthan
predicated,0.5wattspersquaremeterofareaburnedaresoakedupbytheearthfrom
greenhousegases,but0.9wattspersquaremeterwillbesentbackintospace.Theneteffectis
cooling.Wattsareusedtomeasurethera