列车长为L，铁路桥长也是L，列车沿平直轨道匀加速过桥，车头过桥头的速度是v₁，车头过桥尾的速度是v₂，则车尾通过桥尾时的速度为( 　)

A．v₂

B．2v₂－v₁

C．

D．

Only in this way ______ from your friends.

A．you can learn

B．can you learn

C．can learn you

D．you learn can