在以British and American English为主题的课堂前面列出以下四条名人语录，组织学生进行讨论。 (a) We have really everything in common with America nowadays except, of course, language. (b) Within a century British and America English speakers will not be able to understand each other. (c) America and English are two countries divided by a common language. (d) It doesn’t make much of a difference whether a teacher speaks British or America English. 试对以上案例进行分析。