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
A.1850 B.1852 C.1846 D.1848正确答案A
