GPRS点对点无连接网络业务属于数据报业务类型，是由提供两个用户之间网络层通信的无连接网络协议CLNP和IP协议支持的业务。（）
参考答案：对
世界上面积最大的洲是（ ）。
A．亚洲
B．欧洲
C．北美洲
D．南极洲
--- It was said that little Bill hit his classmate on the head.
---He is thought to be a(an )________ boy, who is always ready to start a fight.
A．ashamed
B．awkward
C．desperate
D．aggressive
