【TheVineThatAtetheSouthKudzuisafast-growingvine（蔓生植物）thatcoversalargeareainthesouthernUnitedStates．Itissocommonthatonemightthinkitisanativeplant，butitisnot．KudzuwasbroughttotheUnitedStatesfrom】

　　TheVineThatAtetheSouth

　　Kudzuisafast-growingvine（蔓生植物） thatcoversalargeareainthesouthernUnitedStates．Itissocommonthatonemightthinkitisanativeplant，butitisnot．KudzuwasbroughttotheUnitedStatesfromJapanin1876．ManyAmericansthoughtitwasbeautiful，andtheybegantoplantit．Theydidn’tknowitcouldgrowuptoafootadayduringthesummermonths．Nordidtheyknowitwouldgrowupandoveranythinginitspath（路径）．

　　InJapan，kudzuexperiencedcoldwintersandashortgrowingseason．ButintheUnitedStates，ithasaverylonggrowingseasonwithwarmandwetsouthernweather．Itisfineweatherforthevinetogrowfast．

　　Inthe1920s，peopleusedthevinetofeedfarmanimals．Tenyearslater，thegovernmentsupportedtoplantkudzubecauseitkeptsoil（土壤） fromwashingaway．However，bythe1950s，thegovernmentnolongerwantedpeopletoplantthevine．Twentyyearsafterthat，thegovernmentsaiditwasaharmfulplant．

　　Thevinegrowsuptreesandbuildings，makingsomebeautifulshapes．However，treesdieafterkudzucoversthembecausetheycannotgetenoughlight．Scientistsarelookingforwaystokillthevine．Theyusedpoisons（毒药） tokillthevine．However，someofthepoisonsmadeitgrowevenbetter．ScientistsalsofinditdifficulttodigupKudzu．Theplantisreallytough．

　　Becausekudzuissohardtokill，somepeoplearemakingthebestofit．Sotheytrytofinddifferentusesforthevine．Theyfindthevinecanbeusedtomakepaperandbaskets，itcanbeusedtofeedthegoats，anditcanevenbeeatenbypeople．Scientistsarestudyingitinthehopethatthevinecanbeusedasamedicine．Attheveryleast，kudzuservesasanexampleoftheunexpectedresultsthatcancomefromnon-nativeplants．

　　42．Wecanlearnfromthepassagethat．___

　　A．kudzumostlygrowsinthenorthernAmerica

　　B．kudzuwasbroughttoJapanfromAmerica

　　C．kudzugrowsveryfastinwarmandwetweather

　　D．Americangovernmenthasneversupportedtoplantkudzu

　　43．Theunderlinedword“tough”inParagraph4probablymeans“___”．

　　A．noteasilybroken B．widelyused

　　C．hardtogrow D．importanttoone’shealth

　　44．Thelastparagraphismostlyabout___．

　　A．howquicklyth