从发生上认识网络、网络由（）所构成.
A、现代通信技术
B、计算机技术
C、信息技术
D、信息高速公路
参考答案：A, B, C, D
简答流线型运动的特征是什么？
After living there for one year, they have _______there.
A．accustomed to working
B．accustomed to work
C．been accustomed to working
D．been accustomed to work
