问题补充：
—Excuse me, is the library from here?
—It’s about 5 minutes’ walk.
A. How long
B. How far
C. How soon
D. How often
答案：
A. How long
(答案→)B. How far
C. How soon
D. How often
解析：A. How long多长时间 B. How far多远的距离C. How soon多久，一般与将来时态连用 D. How often多久一次，表示频率；句意：打扰了，请问博物馆离这里有多远呢？步行需要5分钟。故选B
