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1、高考英语真题专项汇编卷（2017-2019）知识点07阅读理解1、Californiahaslosthalfitsbigtreessincethe1930s,accordingtoastudytobepublishedTuesdayandclimatechangeseemstobeamajorfactor(因素).Thenumberoftreeslargerthantwofeetacrosshasdeclinedby50percentonmorethan46,000squaremilesofCaliforniaforests,thenewstud
2、yfinds.Noareawassparedorunaffected,fromthefoggynortherncoasttotheSierraNevadaMountainstotheSanGabrielsaboveLosAngeles.IntheSierrahighcountry,thenumberofbigtreeshasfallenbymorethan55percent;inpartsofsouthernCaliforniathedeclinewasnearly75percent.Manyfactorscontributedtothedecl
3、ine,saidPatrickMclntyre,anecologistwhowastheleadauthorofthestudy.Woodcutterstargetedbigtrees.Housingdevelopmentpushedintothewoods.AggressivewildfirecontrolhasleftCaliforniaforestscrowdedwithsmalltreesthatcompetewithbigtreesforresources(资源).ButincomparingastudyofCaliforniafore
4、stsdoneinthe1920sand1930swithanotheronebetween2001and2010,Mclntyreandhiscolleaguesdocumentedawidespreaddeathofbigtreesthatwasevidenteveninwildlandsprotectedfromwoodcuttingordevelopment.Thelossofbigtreeswasgreatestinareaswheretreeshadsufferedthegreatestwatershortage.Theresearc
5、hersfiguredoutwaterstresswithacomputermodelthatcalculatedhowmuchwatertreesweregettingincomparisonwithhowmuchtheyneeded,takingintoaccountsuchthingsasrainfall,airtemperature,dampnessofsoil,andthetimingofsnowmelt(融雪).Sincethe1930s,Mclntyresaid,thebiggestfactorsdrivingupwaterstre
6、ssinthestatehavebeenrisingtemperatures,whichcausetreestolosemorewatertotheair,andearliersnowmelt,whichreducesthewatersupplyavailabletotreesduringthedryseason.1.Whatisthesecondparagraphmainlyabout?A.Theseriousnessofbig-treelossinCalifornia.B.TheincreasingvarietyofCaliforniabig
7、trees.C.ThedistributionofbigtreesinCaliforniaforests.D.TheinfluenceoffarmingonbigtreesinCalifornia.2.Whichofthefollowingiswell-intentionedbutmaybebadforbigtrees?A.Ecologicalstudiesofforests.B.Banningwoodcutting.C.Limitinghousingdevelopment.D.Firecontrolmeasures.3.Whatisamajor
8、causeofthewatershortageaccordingtoMclntyre?A.Inadequatesnowmelt.B.Al
