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在执行switch结构时，能够立即退出该结构的语句是___。

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至少运行一次循环体的循环语句是___。

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程序的三种基本结构是_结构、_结构和___结构。

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The advantages of Internet-based communications are many except ( )?

A. Save money
B. Save time
C. Against to viruses
D. A, B and C

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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.

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在执行switch结构时，能够立即退出该结构的语句是___。

至少运行一次循环体的循环语句是___。

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 ( )?

The incorrect choice about instant message is ( )?

程序的三种基本结构是_结构、_结构和___结构。