问题补充：
--are you staying in Ottawa?
--About two weeks.
A. How many
B. How long
C. How far
D. How soon
答案：
A. How many
(答案→)B. How long
C. How far
D. How soon
解析：疑问词辨析. How many多少个; How long 多长; How far 多远;How soon多久.根据答语About two weeks.大约两周,可提问的是时间长短,故用how long.选B.
