单项选择题
Section A 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 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 centre.
What is the probable relationship between the two speakers （） A．Manager and clerk.
B．Director and secretary.
C．Doctor and nurse.
D．Professor and student.