问题补充:
---is it from your home to the museum? --- About six kilometers.
A. How long
B. How much
C. How far
D. How often
答案:
A. How long
B. How much
(答案→)C. How far
D. How often
解析:How long多长;How much多少元;How far多远;How often多久一次;根据下文,大约六千米。可知前文问的是,从你家到博物馆有多远?故选C。