第一节 （共5小题，每小题1.5分，满分7.5分）
听下面一段对话，回答第1至5题。
1. What did the man use to be interested in collecting?
A. Stamps B. Coins C. Cards
2. What’s the probable relationship between the two speakers?
A. patient and doctor B. Customer and salesman C. Professor and student
