第一节；听力理解（共15小题；每小题1分，满分15分）
每段播放两遍。各段后有几个小题，各段播放前每小题有5秒钟的阅题时间。请根据各段播放内容及其相关小题，在5秒钟内从题中所给的A、B、C项中选出最佳选项，并在答题卡上将该项涂黑。
请听第1段对话，回答第1－3题。
1. What are the speakers mainly talking about?
A. Using the left hand. B. Operating machines. C. Designing machines.
2. What’s the possible relationship between the speakers?
A. Teacher and student. B. Boss and secretary. C. Fellow workers.
3. What can we learn from the conversation?
A. Left-handers can’t run this kind of machine. B. The woman is left-handed.
C. The man is more skillful than the woman.
