春秋五霸首霸是 [ ]
A．齐桓公
B．晋文公
C．楚庄王
D．宋襄公
答案：A
What can you do? [ ]
A. I can sweep the floor.
B. I can do the dishes.
C. I can set the table.
如果IP地址为202.130.191.33，屏蔽码为255.255.255.0，那么网络地址是_______。
A．202.130.0.0
B．202.0.0.0
C．202.130.191.33
D．202.130.191.0
[ ]