Question

--Kate, do you know ________ it is from here to the gym?

--About twenty-minutes' walk.

1. A.
   how long
2. B.
   how far
3. C.
   how soon
4. D.
   how often

Answer 1

B
解析：考查特殊疑问词的用法。通过下文“About twenty-minutes' walk.”可以看出上文是对距离提问。用how far。而how long是对距离提问；how soon是对多久以后提问；how often是对频率提问。故选B。难度不大。