第一部分听力（共20小题；每题1分, 满分20分）
第一节听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。
1. What did the man do yesterday afternoon?
A. He wrote some letters to his friends.
B. He typed some business letters.
C. He read some business letters.
