一、单选
1. __ is the distance from the mount to the river?
A. How far B. how soon C. how often D. how long
2. __ do you exercise in a week?
A. How long B. how far C. how to D. how often
3. __ will you go back from Hong Kong?
-- in 3 days.
A. How long B. how far C. how soon D. how often
