Urbanization••(2013·高考北京卷)Untilrelativelyrecently,thevastmajorityofhumanbeingslivedanddiedwithouteverseeingacity
Thefirstcitywasprobablyfoundednomorethan5,500yearsago
__71__Infact,nearlyeveryonelivedonfarmsorintinyrural(乡村的)villages
Itwasnotuntilthe20thcenturythatGreatBritainbecamethefirsturbansocietyinhistory—asocietyinwhichthemajorityofpeopleliveincitiesanddonotfarmforaliving
•Britainwasonlythebeginning
__72__Theprocessofurbanization—themigration(迁徙)ofpeoplefromthecountrysidetothecity—wastheresultofmodernization,whichhasrapidlytransformedhowpeopleliveandwheretheylive
•In1990,fewerthan40%ofAmericanslivedinurbanareas
Today,over82%ofAmericansliveincities
Onlyabout2%liveonfarms
__73__•Largecitieswereimpossibleuntilagriculturebecameindustrialized
Eveninadvancedagriculturalsocieties,ittookabou