问题补充：
—is it from your home to your school?
—It takes about twenty minutes by bike.
A. How long
B. How far
C. How many
D. How much
答案：
A. How long
(答案→)B. How far
C. How many
D. How much
解析：A. How long多长时间 B. How far多远的距离 C. How many多少，修饰可数名词的复数形式 D. How much多少，修饰不可数名词；句意：从你家到学校有多远？骑自行车车大约需要20分钟。故选B
