除了战争外，下列事件中成为战国纷争重要内容的是[ ]
A．定期朝拜周天子
B．抵御少数民族的进扰
C．合纵和连横
D．争夺霸主地位
C
31. — I'm wondering why the visitors chose to stay with the host family.
— _____real local life.
A．Experiencing
B．Experience
C．To experience
D．Having experienced
