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

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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