In fact, he ___ in bed all the morning without doing anything, but he _____ to me about that.

A．lied, lied

B．lay, lay

C．lied, lay

D．lay, lied

[计算题]有一未改建的曲线，其半径为300m，缓和曲线长度为50m，求每10m缓和曲线轨距应递减多少？