AlmosteverybodyinAmericawillspendapartofhisorherlifebe...
问题详情： AlmosteverybodyinAmericawillspendapartofhisorherlifebehindashoppingcart.Theywill,inalifetime,pushthechrome-platedcontraptionsmanymiles.Butfewwillknow—oreventhinktoask—whoitwasthatinventedt...