2022版高考英语一轮复习选修6Unit5Thepowerofnature学案含解析新人教版.doc

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1、优选Unit5Thepowerofnature————[单元主题语境]———人与自然之自然灾害与防X，安全常识与自我保护(2019·高考某某卷)话题：气候变化与大树变少　词数：314难度：★★★★Californiahaslosthalfitsbigtreessincethe1930s，accordingtoastudytobepublishedTuesdayandclimatechangeseemstobeamajorfactor(因素)．Thenumberoftreeslargerthantwofeetacrosshasdeclinedby50percentonmorethan46,000

2、squaremilesofCaliforniaforests，thenewstudyfinds.Noareawassparedorunaffected，fromthefoggynortherncoasttotheSierraNevadaMountainstotheSanGabrielsaboveLosAngeles.IntheSierrahighcountry，thenumberofbigtreeshasfallenbymorethan55percent；inpartsofsouthernCaliforniathedeclinewasnearly75percent.Manyfactorscon

3、tributedtothedecline，saidPatrickMcIntyre，anecologistwhowastheleadauthorofthestudy.Woodcutterstargetedbigtrees.Housingdevelopmentpushedintothewoods.AggressivewildfirecontrolhasleftCaliforniaforestscrowdedwithsmalltreesthatpetewithbigtreesforresources(资源)．ButinparingastudyofCaliforniaforestsdoneinthe1

4、920sand1930swithanotheronebetween2001and2010，McIntyreandhiscolleaguesdocumentedawidespreaddeathofbigtreesthatwasevidenteveninwildlandsprotectedfromwoodcuttingordevelopment.Thelossofbigtreeswasgreatestinareaswheretreeshadsufferedthe-18-/18优选greatestwatershortage.Theresearchersfiguredoutwaterstresswit

5、haputermodelthatcalculatedhowmuchwatertreesweregettinginparisonwithhowmuchtheyneeded，takingintoaccountsuchthingsasrainfall，airtemperature，dampnessofsoil，andthetimingofsnowmelt(融雪)．Sincethe1930s，McIntyresaid，thebiggestfactorsdrivingupwaterstressinthestatehavebeenrisingtemperatures，whichcausetreestolo

6、semorewatertotheair，andearliersnowmelt，whichreducesthewatersupplyavailabletotreesduringthedryseason.[语篇解读]　本文是一篇调查报告。调查表明，加利福尼亚州的大树变少了，而气候变化是其中的一个主要因素。27．Whatisthesecondparagraphmainlyabout?A．TheseriousnessofbigtreelossinCalifornia.B．TheincreasingvarietyofCaliforniabigtrees.C．Thedistributionofbigtre

7、esinCaliforniaforests.D．TheinfluenceoffarmingonbigtreesinCalifornia.解析：段落大意题。第二段中通过列举一系列数字表明，加利福尼亚州的大树减少的严重性，故A项正确。答案：A28．Whichofthefollowingiswellintentionedbutmaybebadforbigtrees?A．Ecologicalstudies