问题补充：
--- is the train station from the school?---About twenty-minute bike ride.
A. How many
B. How long
C. How far
D. How soon
答案：
A. How many
B. How long
(答案→)C. How far
D. How soon
解析：How many多少个；How long多长；How far多远；How soon多久。根据下文，骑自行车大约二十分钟。可知上文问的是距离远近，故选C，从这所学校到火车站有多远？
