George is a famer. He小题1:_________(get) up very early every day. He doesn’t like 小题2:_____(stay) in bed. He drives a yellow car to his farm and works very hard. On weekends he often takes his children 小题3:______ the park and plays football there. They all like football, so they often watch the football match 小题4:_____ TV. Their小题5:f_________ football player is David Beckham.

如下图所示，AC杆所受的内力为( )。

A．剪力

B．无内力

C．受压轴力

D．受拉轴力