We now know that these viruses often attack computers on Fridays and then they are travelling to a lot of computers. Last year, England, Australia, America and some other countries were attacked by computer viruses. And till now, how to get rid of (消除)the viruses is still a problem.
（   ）74. The group of young people made viruses to     .
A. get other people happy           B. attack other people
C. show the world they were bright   D. make computers work better
简评：此题答案为 C (问题设计在第二段的第一句及与之相关的事实,依据整段意义分析选B)。
（   ）75. The computer viruses can make computers      .
      A. work much faster than usual        B. work more slowly than usual
C. keep much more information        D. work with many scientists together
简评：此题答案为 B(跟随文章的第一句之后问题设计在第二个句子的信息中,依据全文的中心及日常知识判断答案为B)。
（   ）76. When the computers were infected by viruses, most of their information would be    .  
A. taken into some other computers       B. kept well
C. changed                         D. gone away
简评：此题答案为D(问题设计在文章的第一段第三句,依据全文的整体意思及所给的选项的词义去分析判断答案为D)。
（   ）77. From the story above, we know that         .
A. it is still difficult to do with the computer viruses
B. the viruses are dangerous to people' s health
C. in 1989 no computers in China were attacked by computer viruses
D. most countries in the world were attacked by computer viruses last year
简评：此题答案为A(问题设计在文章的最后一句，词句为文章的主题句，依据全文所描述的信息及对电脑日常知识的认识去分析、判断答案为A)

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