计算机网络由（）两部分组成。
A、通信子网
B、资源子网
C、硬件网络
D、软件系统
参考答案：A, B
—Where is Bruce? Is he at home?
—I think he _____ school. [ ]
A. has gone
B. has been
C. has gone to
D. has been to
多形红斑中医名称是：（）
A.热疮
B.猫眼疮
C.风热疮
D.蜘蛛疮
E.湿疮
