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.