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1、AmericanNationalParksTheNationalParkServiceoftheUSAcontrolsmorethan77millionacresofland,dividedupinto320parksitesofextraordinaryvariety,thelatestcoveringhugeareasofwildernessinAlaskathereareurbanorcityparks,thereareancientbuildingsandhistoricsites,seashoreparks,nationalrivers,andmoreandmore
2、recreationareaswherepriorityisgiventotheamusementofthepublic.FinallytherearetheNationalParksthemselves,whicharevisitedbymillions,butwherethepriorityisconservation.Inacountryoffreeenterprise,wherebusinessinterestsaresopowerful,theseparksplayanessentialrole.Itwastheconservationistswhosavedthe
3、remaininggiantredwoodtreesandcreatedtheNationalRedwoodPark,onthefarsideoftheGoldenGateBridgewhichspanstheentrancetoSanFranciscoBay.Thelumberjacksweresofuriousthattheymarchedintothecitytoprotest,shouting“Nomoreparks!”Buttheenvironmentalistsandconservationistshavealwaysbeenallowedtohavetheirs
4、ayinthe“LandoftheFree”,andtheirinfluencehasbeengreaterthaninmostcountries.Thefirstnationalpark,foundedin1872,wasYellowstone,intheStateofWyoming.Yellowstonehaseverythingwhichappealstotheromantic,geyserswhichshootjetsofboilingwater200feetupintotheair,adeepcanyonwherearushingriverpoursovermigh
5、tywaterfalls.Therearesnowymountainpeaks,tree-fringedlakesandvastforests,aswellasbroadwatermeadows,acrosswhichtheYellowstoneRiverglidesgentlyonitswaytothecanyon.Onthesemeadowsbison,elk,mooseanddeercometograzeintheevening.Americannationalparksrepresentoneofthefinestexamplesofnatureconservatio
6、nintheworld.Alltheparksarekeptas“natural”aspossible.IntheFarWest,lumbermendevastatedwholeforests.Butnotree-fellingisallowedintheparks.Whenatreefalls,itislefttorotandenrichthesoil,andsoencourageyoungtreestogrow.Evennaturalforestfires,thosenotstartedbyman,areallowed,inmanyparks,toburnthemselv
7、esout.Animalslearnedyearsagothatmanwasnottheirenemyinthenationalparks.Manyofthembecamesotamethattheywereanuisance,andsometimesevenadanger.Bears,inparticular,linedtheroadsandbeggedforfood.Theyweresocomicalthatpeoplestoppedtofeedthem,thusbreakingoneofthest