听下面一段对话,回答第1-3题。 1. What can the woman be? A. She is a waitress at a hotel. B. She is the secretary of Mr Black. C. She is the assistant of Professor Green. 2. How would the man get in touch with Mr Green? A. Find where the Blackwood Hotel is. B. Go upstairs to Room 304 straightly. C. Dial 64 to find the number of the Blackwood Hotel. 3. Why did the man ask the woman to change the dollar? A. To pay for the information. B. To make a phone call. C. To take a bus.