Karen prepared the report with ___________ speed.
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He’s been a __________ since the accident.
I’ve got into the __________ of running every morning.
We are quite ___________ of our success in business.
下列哪个描述是错误的()
A. 数据通信是计算机网络的基础
B. 数据通信系统可大体分为:源系统、传输系统和目的系统三大部分
C. 通信的目的是为了传递信息
D. 信息的载体只能是文字