255.
W: Excuse me, could you tell me where the post office is?
M: Post office? It's not far from here. Do you know Xinhua Road?
W: I'm from the United States and this is my first trip to your city. I know nothing about the city.
M: Oh, welcome to our city, I'll show you the road. Please follow me.
W: Thanks, by the way, where can I buy a map of the city?
M: Just at the gate of the post office. Look, the post office is jut across the street.
W: Thank you very much. Good-bye.
M: Good-bye.

答案解析：
(1) 正确答案为B。根据where can I buy a map of the city?我在哪儿能买到这个城市的地图？可知，女子要买这个城市的地图，因此B项正确。
(2) 正确答案为C。根据I'm from the United States我来自美国。可知，女子来自美国，因此C项正确。