My grandparents have lived in a town near Nanjing 　　　. They enjoy their life in the town.

A．for many years ago

B．since many years

C．many years ago

D．for many years

现代劳动人事管理的特点主要是以( )为核心。

A．人

B．经济效益

C．法律法规

D．人事制度