— What is your plan for the holiday, Paul?

— I'll go on a trip to Yunnan Province with my family.

— _____.[      ]

A. Have a nice time  

B. Good luck    

C. Come back soon  

D. Congratulations

当CPU执行操作系统代码时，处理器处于( )。

A．自由态

B．用户态

C．核心态

D．就绪态