Staying in the hotel for a day costs _______ renting a room in a dormitory for a week. [ ]

A. twice as much as

B. as much twice as

C. as twice much as

D. twice than

电子商务是以( )为基础平台，利用电子工具实现的在线商业交换和行政作业活动的全过程。

A．计算机与通信网络

B．因特网

C．专用网络

D．广域网