Section A
Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.
听力原文：W: Excuse me, Professor Hill. May I ask you a few questions？
M: Yes, of course. But I'm sorry I have a class at ten. Why don't you come at my office hour？ That is 4 to 5 pm, Monday, Thursday and Friday.
Q: Why can't Professor Hill answer her questions now？
(1)

A. He will only be available in the afternoon.
B. It's not his office hour.
C. He doesn't have time right now.
D. He is too tired after class.