单项选择题

Section A
Directions: This section is to test your listening ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. Both the dialogues and questions will be spoken only once. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.

What is the most probable relationship between the two speakers()

A.Mother-son.
B.Waitress-customer.
C.Servant-master.
D.Driver-passenger.