问题补充：
--- is the theme park?
--- It’s about half an hour’s bus ride.
A. how long
B. how soon
C. how far
D. how often
答案：
A. how long
B. how soon
(答案→)C. how far
D. how often
解析：how long多长；how soon多久；how far多远；how often多久一次。根据下文，乘公交车大约半个小时。可是上文问的是距离远近，故选C。
