(2019·全國卷Ⅲ)Beforethe1830s,mostnewspapersweresoldthrough...
問題詳情：(2019·全國卷Ⅲ)Beforethe1830s,mostnewspapersweresoldthroughannualsubscriptionsinAmerica,usually$8to$10ayear.Today$8or$10seemsasmallamountofmoney,butatthattimetheseamountswereforbiddingtomostc...