要实现VTP动态修剪，在VTP域中的所有交换机都必须配置成______。
A．服务器
B．服务器或客户机
C．透明模式
D．客户机
参考答案：A
It took me_________days to finish drawing a beautiful horse.
A．a half dozen
B．half a dozen
C．half dozens
D．half dozen
The two balls fell ________the same speed and landed ________the ground at the same time.
A．off;on
B．by;in
C．with;on
D．at;on
