7．One of the drawbacks of a computer is that it cannot he used as a recreational device.
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We can infer that ______.
A. there will be no distinction between micros and mainframes in the future
B. a future computer can use several CPUs to work for it at the same time
C. the fifth generation computer will be produced within 2 years
D. electronic computers will soon be out of date
8．It seems that there is less distinction between a mainframe and a supercomputer.
Which of the following is implied but not stated？
A. Pupils can use computers to do their homework.
B. Advanced techniques may bring both benefits and harms to our society.
C. The distinction between micros and mainframes has become blurred.
D. A great variety of information sources are available on computer networks.
Sniffer工具可以截获口令等秘密信息，它属于()。
A. 网络监听工具
B. 商品扫描工具
C. 欺骗工具
D. 电子邮件攻击工具
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