—How do you go to school every day?

—I ____ , but I ____ by bike a year ago.

A．go to school by foot; went

B．would go to school on foot; liked to go

C．walk; used to go

D．will walk to go school; was used to going

长木板A放在光滑水平面上，质量为m的物块初速度V₀滑上A的水平上表面，它们的v-t图象如图所示，则从图中所给的数据V₀、V₁、t₁及物块质量m可以求出 (        )

A．A板获得的动能　　  B．系统损失的机械能

C．木板的最小长度　　  D．A、B之间的动摩擦因数