单项选择题
M: I need three stamps and an envelope please. W: Sorry, Sir. You’ re at the wrong window. Go to Window 7, please.
A. In a restaurant. B. In a hospital. C. At a post office. D. At a railway station.
A. 20 minutes before departure B. 30 minutes before departure C. 45 minutes before departure D. 60 minutes before departure
A. they look like fare inspectors B. they don’t wear uniform C. they are polite to passengers D. they often take a back seat