隋唐以前,官府设有谱局,考定父祖官爵、门第。此后该现象逐步消失,主要原因是( )
A:分封制的终结
B:郡县制的完善
C:科举制的推行
D:行省制的实行
The Great Wall is ____________ wall in the world. There are many stories about it.