after years of heated debate, gray wolves were reintroduced to 阅读理解答案

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1、Afteryearsofheateddebate,graywolveswerereintroducedto阅读理解答案　　Afteryearsofheateddebate,graywolveswerereintroducedtoYellowstoneNationalPark.FourteenwolveswerecaughtinCanadaandtransportedtothepark.Bylastyear,theYellowstonewolfpopulationhadgrowntomorethan170wolves.　　Graywolvesoncewere

2、seenhereandthereintheYellowstoneareaandmuchofthecontinentalUnitedStates,buttheyweregraduallydisplacedbyhumandevelopment.Bythe1920s,wolveshadpracticallydisappearedfromtheYellowstonearea.TheywentfarthernorthintothedeepforestsofCanada,wheretherewerefewerhumansaround.　　Thedisappearanc

3、eofthewolveshadmanyunexpectedresults.Deerandelkpopulations—majorfoodsources(来源)forthewolf–grewrapidly.Theseanimalsconsumedlargeamountsofvegetation(植被),whichreducedplantdiversityinthepark.Intheabsenceofwolves,coyotepopulationsalsogrewquickly.Thecoyoteskilledalargepercentageofthepar

4、k’sredfoxes,andcompletelydroveawaythepark’sbeavers.　　Asearlyas1966,biologistsaskedthegovernmenttoconsiderreintroducingwolvestoYellowstonePark.Theyhopedthatwolveswouldbeabletocontroltheelkandcoyoteproblems.Manyfarmersopposedtheplanbecausetheyfearedthatwolveswouldkilltheirfarmanimal

5、sorpets.　　Thegovernmentspentnearly30yearscomingupwithaplantoreintroducethewolvers.TheFishandWildlifeServicecarefullymonitorsandmanagesthewolfpacksinYellowstone.Today,thedebatecontinuesoverhowwellthegraywolfisfittinginat,deer,andcoyotepopulationsaredown,whilebeaversandredforeshavem

6、adeacomeback.TheYellowstonewolfprojecthasbeenavaluableexperimenttohelpbiologistsdecidewhethertoreintroducewolvestootherpartsofthecountryaswell.　　isthetextmainlyabout?　　A.WildliferesearchintheUnitedStates.　　B.PlantdiversityintheYellowstonearea.　　C.Theconflictbetweenfarmersandgraywo

7、lves.　　D.ThereintroductionofwolvestoYellowstonePark.　　doestheunderlinedword“displaced”inparagraph2mean?　　A.Tested.B.Separated.C.Forcedout.D.Trackeddown.　　didthedisappearanceofgraywolvesbringabout？　　A.Damagetolocalecology.B.Adeclineinthepark’sincome.　　C.Preservationofvegetation.D.A

8、nincreaseinthevarietyofanimals.