题目内容：
BThecowboyistheheroofmanymovies.Heis，eventoday，asymbolofcourageandadventure.Butwhatwasthelifeofthecowboyreallylike?
Thecowboy‘sjobisclearfromtheword“cowboy”。Cowboysweremenwhotookcareofcowsandothercattle.ThecattlewereintheWestandinTexas.PeopleinthecitiesoftheEastwantedbeeffromthesecattle.Trainscouldtakethecattleeast.Butfirstthecattlehadtogettothetrains.Partofthecowboy’sjobwastotakethecattlehundredsofmilestotherailroadtowns.
Thetripswerecalledcattledrives.Acattledriveusuallytookseveralmonths.Cowboysrodeforsixteenhoursaday.Becausetheyrodesomuch，eachcowboybroughtalongabouteighthorses.Acowboychangedhorsesseveraltimeseachday.
Thecowboyshadtomakesurethatthecattlearrivedsafely.Beforestartingonadrive，thecowboysbrandedthecattle.Theyburnedamakeonthecattletoshowwhotheybelongedto.Butthesemarksdidn‘tstoprustlers，orcattlethieves.Cowboyshadtoprotectthecattlefromrustlers.Rustlersmadethedangeroustripevenmoredangerous.
Eventhoughtheirworkwasverydifficultanddangerous，cowboysdidnotearnmuchmoney.Theywerepaidbally.Yetcowboyslikedtheirwayoflife.Theylivedinawildandopencountry.Theylivedalifeofadventureandfreedom.
Thecowboy‘sjobwas________.
A.tobeahero
B.totakecareofcattle
C.tobearustler
D.tobeadriver
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