Tom didn’t go out to play until he had finished doing his homework. Not until ____.
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I was greatly relieved to hear that her condition was not serious.It was with ____.
The matter happens to have been investigated by the policemen. It happens that ____.
_________实现了多种传播方式的统一数字化处理，交互性传播模式使传播权力面临深层次的结构调整的传播革命。
A. 文字
B. 印刷术
C. 电报
D. 互联网
第四次传播革命的基本特征：
A. 去中心化
B. 去中心化—再中心化
C. 中心化
D. 再中心化
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