2. 外语
  3. Viruses are human-made software programs【B1】specifically to wreak havoc on personal computers and networks. The【B2】of contractin

Viruses are human-made software programs【B1】specifically to wreak havoc on personal computers and networks. The【B2】of contractin

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问题     Viruses are human-made software programs【B1】specifically to wreak havoc on personal computers and networks. The【B2】of contracting one of these computer viruses over the Internet has increased dramatically. Typically, you get a virus by opening e-mail【B3】.
    Some viruses are relatively【B4】to individuals. They just【B5】themselves to【B6】messages or e-mail themselves to all the people listed in your address book. The sudden flood of e-mail【B7】mail servers, causing the system to【B8】.
    Other viruses are more【B9】and may lie asleep until a certain date. Then they【B10】to life to do their dirty【B11】. Sometimes a strange message appears on your screen, or data and programs may be【B12】. In the worst case, all the contents of your hard drive may be【B13】out. These【B14】programs start on one computer, then replicate quickly,【B15】other computers around the world.
    In 1988, a student at Cornell University sent out a virus by【B16】, nearly【B17】the Internet to its knees. More recently, the "I Love You" virus caused over $1 billion in lost【B18】as it【B19】e-mail systems worldwide. Last year【B20】, 10,000 new viruses, worms and Trojan horses were unleashed.
选项 A、existed
B、discovered
C、created
D、manufactured
答案C
解析 动词词义辨析。计算机病毒只能是“创造，设计”出来的，created，不可能是已经有的“被发现”，discovered，也不可能是已经“存在”，existed，或者是通过机械工程“制造”出来的， manufactured。
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