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外语
A、It first appeared in 1988. B、It traveled via e-mail messages. C、It first broke out in Britain. D、It was meant to steal documen
A、It first appeared in 1988. B、It traveled via e-mail messages. C、It first broke out in Britain. D、It was meant to steal documen
admin
2012-05-28
42
问题
What is the difference between a computer virus and a computer worm? Both can infect and damage computer systems. However, computer viruses and computer worms differ in the way they reproduce and spread. A virus, which is short for "vital information resources under siege", is a program or code that secretly enters a computer by piggybacking on e-mail messages, files, or programs shared between two different computer systems. Then the virus infects its new host by attaching itself to the files within that computer and deleting or changing them or even overwriting entire programs. Just like a biological virus in the human body, a computer virus replicates itself so that it will continue to be contagious when data is shared with another computer system. In 2000, for example, the famous "Love Bug" virus, which traveled via e-mail messages, destroyed files in computers all over the world. Worms, too, are malicious programs that reproduce and spread. But unlike viruses, they do not need to attach themselves to other files. They are programs that run independently and spread on their own through computer networks. Thus they do not require human intervention to make their way from one computer to another. The famous Internet worm of 1988, for example, copied itself across the Internet, destroying many computer systems as it went. Currently, computer analysts are worried about the Sasser worm, which disabled computers in Britain, South Africa, and Taiwan.
Questions 29 to 31 are based on the passage you have just heard.
29. In what aspect do computer viruses and computer worms differ?
30. What can we learn about the "Love Bug" virus from the passage?
31. Which of the following statements is true about computer worms?
选项
A、It first appeared in 1988.
B、It traveled via e-mail messages.
C、It first broke out in Britain.
D、It was meant to steal documents.
答案
B
解析
选项中的It,first appeared/broke out,traveled via e-mail等表明,It可能指电脑病毒,本题可能考查它的产生或传播。短文中举例提到,在2000年,著名的“爱虫”病毒通过电子邮件传播(traveled via e-mail messages),破坏了世界各地电脑里的文件,由此可知,答案为[B]。
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0
大学英语六级
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