—What is your hobby?

—I ________ collecting stamps, but now I love reading.

A．used enjoy

B．used to enjoy

C．use to enjoying

D．used to enjoying

按传输技术分类，计算机网络可分为

A．点—点式网络和广播式网络

B．资源网和通信网

C．局域网、城域网和广域网

D．星型网、总线型网和环型网