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: What's the problem, Paul？ You really look panicked.
M: I am speaking to a group of high school students about engineering this afternoon. But I have no idea how I am going to simplify some of the concepts for them.
Q: What can be inferred about the man？
(12)

A. He can't explain some concepts of engineering.
B. He regularly gives talks to high school students.
C. He doesn't want the woman to postpone the talk.
D. He hasn't finished preparing for his presentation.