在本节中，你将听到15个对话，每个对话有1个问题。请从[A]、[B]、[C]三个选项中选出答案，并标在试卷的相应位置。每段话后有15秒钟的停顿，以便回答问题和阅读下一问题及其选项。每段对话读两遍。
下面，请听这些对话。 What is the relationship between the two speakers
A． They are doctor and patient. B． They are teacher and student. C． They are mother and son.