程序的三种基本结构是___结构、___结构和___结构。
The advantages of Internet-based communications are many except ( )?
A. Save money
B. Save time
C. Against to viruses
D. A, B and C
The incorrect choice about instant message is ( )?
An IM communications service enables you to create a kind of private chat room with another individual.
B. An IM communications service enables you to communicate in real-time over the Internet even the world.
C. IM system alerts you whenever somebody on your buddy or contact list is online.
D. IM can save time for employees but increase the amount of money a business spends on communications.
The incorrect choice about Spim is ( )?
A. The spim typically contains a link to a Web site that the spimmer is trying to market.
B. Spim is a bit more intrusive than spam due to the nature of IM itself.
C. Spim is the IM equivalent of spam and is perpetuated by bots
D. Anti-virus program on your system will help reduce receiving Spim.
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