(2019·全国卷Ⅲ)Beforethe1830s,mostnewspapersweresoldthrough...
问题详情：(2019·全国卷Ⅲ)Beforethe1830s,mostnewspapersweresoldthroughannualsubscriptionsinAmerica,usually$8to$10ayear.Today$8or$10seemsasmallamountofmoney,butatthattimetheseamountswereforbiddingtomostc...