质量为m的物块，当初速度为v₀时，在水平面上滑行的最大距离为s，如果物块的质量增加到2m，速度增大到2v₀时，在同一水平面上金属块滑行的最大距离为（　　）

A．s

B．2s

C．4s

D．

Once or twice he has had difficulty making decision on his own, but ______  he is an independent man. [ ]

A. in all

B. in word

C. all in all

D. word in word