问题补充：
---is it from our school to the subway station?
--- About 8 miles.
A. How long
B. How far
C. How often
D. How much
答案：
A. How long
(答案→)B. How far
C. How often
D. How much
解析：A. How long多久B. How far 多远 C. How often多久一次D. How much多少元，一般提问价钱及不可数名词。答案是大约八千米，所以应选B. How far
