单项选择题
Directions:This section is to test your 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 two times. 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 centre.
What is the probable relationship between the two speakers（） A．Doctor and patient.
B．Husband and wife.
C．Teacher and student.
D．Boss and secretary.