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大小:2.26 MB
页数:19页
时间:2019-04-18
《2018届高三英语二轮复习专题三阅读理解第四讲主旨大意题》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、主旨大意题题型1 概括主旨大意类[示例] (2017·全国卷Ⅲ,C)Afteryearsofheateddebate,graywolveswerereintroducedtoYellowstoneNationalPark.FourteenwolveswerecaughtinCanadaandtransportedtothepark.Bylastyear,theYellowstonewolfpopulationhadgrowntomorethan170wolves.GraywolvesoncewereseenhereandthereintheY
2、ellowstoneareaandmuchofthecontinentalUnitedStates,buttheyweregraduallydisplacedbyhumandevelopment.Bythe1920s,wolveshadpracticallydisappearedfromtheYellowstonearea.TheywentfarthernorthintothedeepforestsofCanada,wheretherewerefewerhumansaround.Thedisappearanceofthewolveshadma
3、nyunexpectedresults.Deerandelkpopulations—majorfoodsources(来源)forthewolf—grewrapidly.Theseanimalsconsumedlargeamountsofvegetation(植被),whichreducedplantdiversityinthepark.Intheabsenceofwolves,coyotepopulationsalsogrewquickly.Thecoyoteskilledalargepercentageofthepark’sredfoxe
4、s,andcompletelydroveawaythepark’sbeavers.Asearlyas1966,biologistsaskedthegovernmenttoconsiderreintroducingwolvestoYellowstonePark.Theyhopedthatwolveswouldbeabletocontroltheelkandcoyoteproblems.Manyfarmersopposedtheplanbecausetheyfearedthatwolveswouldkilltheirfarmanimalsorpe
5、ts.Thegovernmentspentnearly30yearscomingupwithaplantoreintroducethewolves.TheU.S.FishandWildlifeServicecarefullymonitorsandmanagesthewolfpacksinYellowstone.Today,thedebatecontinuesoverhowwellthegraywolfisfittinginatYellowstone.Elk,deer,andcoyotepopulationsaredown,whilebeave
6、rsandredfoxeshavemadeacomeback.TheYellowstonewolfprojecthasbeenavaluableexperimenttohelpbiologistsdecidewhethertoreintroducewolvestootherpartsofthecountryaswell.8.Whatisthetextmainlyabout?A.WildliferesearchintheUnitedStates.B.PlantdiversityintheYellowstonearea.C.Theconflict
7、betweenfarmersandgraywolves.D.ThereintroductionofwolvestoYellowstonePark.[解题思路]第一步 速读文章,找出本篇主题句After__years__of__heated__debate,__gray__wolves__were__reintroduced__to__Yellowstone__National__Park.第二步 对比选项,确定答案关键词复现:wolves;__reintroduced;__Yellowstone__National__Park尝试解答 ___
8、_D____[答题技巧]1.识别题干关键(1)What’sthemainideaofthepassage/text?(2)What’sthepassage/text
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