题目解析：
印度曾经是大英帝国的殖民地。录音回放部分之后，lecture介绍了英帝国对孟加拉式平房建筑的影响以及这一建筑风格在世界范围内的普及。正是为了介绍这两点，教授才提到了大英帝国。因此，教授说这句话是为了介绍接下来讲义文的主题。正确答案选B。
【对应原文】
Well, you're right. It is a style of house. I'll talk more about the-uh-the typical, um, features of the bungalow in a minute, but first there's something else we've got to go over. How much do you know about-about the British Empire?
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