题干
—Can you tell me _______ it is from your home to school?
—It’s about three kilometres.
A：how much
B：how long
C：how far
D：how often
答案(点此获取答案解析）
C
—Can you tell me _______ it is from your home to school?
—It’s about three kilometres.
A：how much
B：how long
C：how far
D：how often
上的动点Q到直线
距离的最小值为