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：
试题分析: 句意：火车站离学校多远？大约20分钟的自行车程。How many多少，How long多久， How far 多远，How soon多久；根据About twenty-minute bike ride大约20分钟的自行车程，可知选C.
