[单选题]资料：Askedtonametheirfavoritecity,manyAmericanswouldselectSanFranciscowhichbeganasasmallSpanishoutpostlocatedonamagnificentbay.ThetownwaslittlemorethanavillageservingrancherswhentheUnitedStatestookpossessionofitin1846duringthewarwithMexico.
SanFranciscosprangintoacityovernightbecauseofthenearbydiscoveryofgoldin1848.AgreatrushtoCaliforniatookplace.Wagontrainsploddedtheirdangerouswayacross2000milesofprairieandmountains,whilehundredsofsailingvesselsmadetheequallyhazardoustriparoundtheHorn.Thevesselsdisgorgedthousandsofpassengers--thenthecrewsdesertedtheirshipandhundredsofvesselswerelefttorotinthebay.Withintwoyears,CaliforniahadenoughpopulationtobecomeastateandSanFranciscowasformanyyearsthehubofthatnewly-arrivedpopulation.
Thecity'spresentpopularityisduetoanexcellentclimate,aneasystyleofliving,goodfood,andnumeroustouristattractions.Thecityisfamousforitscablecarswhich"clangandbang"upthesteephills,andforitsexcellentseafoodstallsalongthewharf.MostvisitorsarrivingfromnationsinthePacificBasinspendseveraldaysgettingtoknowthetown.
InwhichyeardidCaliforniabecomeanAmericanstate?()
1850
正确答案：A
题目解析
本题考查的是细节理解。
【关键词】year;California;becomeanAmericanstate
【主题句】第2自然段SanFranciscosprangintoacityovernightbecauseofthenearbydiscoveryofgoldin1848.Withintwoyears,CaliforniahadenoughpopulationtobecomeastateandSanFranciscowasformanyyearsthehubofthatnewly-arrivedpopulation.1848年，由于在其附近发现了金矿，旧金山一夜之间就变成了一座城市。在两年内，加州有足够的人口成为一个州，而旧金山多年来一直是新移民的中心。
【解析】本题的问题是“加州在哪一年成为美国的一个州？”。根据主题句可知，1848年在旧金山附近发现金矿。两年后，加州成为了一个州。因此，加州在1850年成为美国的一个州，故选A。
