SECTION A CONVERSATIONS
Directions: In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow.
听力原文：M: Good morning, Doctor.
F: Good morning, Mr. Smith. What can I do for you ？
M: I feel there's something wrong with me, but I'm not sure.
F: Could you explain more？
M: I usually get a runny nose, watery eyes, scratchy throat and other symptoms on Monday. It will last for the following five days. And since I'm terribly busy with my work, I won't have time to see the doctor. But when I do have time to see the doctor on weekends, the symptoms will disappear all of a sudden.
F: And you will get same symptoms again next Monday？
M: Exactly.
F: How long have you been like this？
M: About one month.
F: Did anything special happen during the past four weeks？
M: Nothing special. Oh, wait! My company has moved from the old address to the present Mount Plaza.
F: Do your colleagues have the same trouble with you？
M: Well, some of them.
F: I see. You must be suffering from so-called sick building syndrome. Some of them can even lead to cancer.
M: That's terrible! Is there anything I can do to the "sick" building？
F: Don't worry. I will write you a prescription to ease your symptoms.
How long has the man suffered from the symptoms he described？

About one weeks.
B. About two weeks.
C. About three weeks.
D. About four weeks.