2019年学位英语考试试题及答案_学位英语试题_学位英语模拟试题-第二页

当前位置：

首页 >> 外语类 >> 学位英语 >> 模拟试题>> 正文

2013年职称英语考试模拟试题四十七

发表时间：2012/7/5 11:05:12 来源：互联网点击关注微信：

关注公众号

为帮助考生有效备考2013年职称英语考试，职称英语考试网小编整理了职称英语模拟试题，希望对您学习职称英语有所帮助！

第2部分：阅读判断（第16～22题，每题1分，共7分）

下面这篇短文后列出7个句子，请根据短文的内容对每个句子做出判断。如果该句提供的是正确信息，请在答题卡上把A涂黑；如果该句提供的是错误信息，请在答题卡上把B涂黑；如果该句的信息文章中没有提及，请在答题卡上把C涂黑。

Computer Virus

The computer virus is an outcome of the computer overgrowth in the 1980s.The cause of the term "computer virus" is the likeness between the biological virus and the evil program infected with computers. The origin of this term came from an American science fiction〝The Adolescence of P-1〞written by Thomas J·Ryan, published in 1977.Human viruses invade a living cell and turn it into a factory for manufacturing viruses. However, computer viruses are small programs. They replicate by attaching a copy of themselves to another program.

Once attached to host Program, the viruses then look for other programs to "infect". In this way, the virus can spread quickly throughout a hard disk or an entire organization when it infects a LAN or a multi-user system. At some point, determined by how the virus was programmed the virus attacks. The timing of the attack can be linked to a number of situations, including a certain time or date, the presence of a particular file, the security privilege level of the user, and the number of times a file is used. Likewise, the mode of attack varies. So－called "benign" viruses might simply display a message, like the one that infected IBM's main computer system last Christmas with a season's greeting.

Malignant viruses are designed to damage the system. The attack is to wipe out data, to delete flies or to format the hard disk.

What Kind of Viruses Are There？ There are four main types of viruses: shell, intrusive, operating system and source ode. Shell viruses wrap themselves around a host program and don't modify the original program. Shell programs are easy to write, which is why about half of viruses are of this type. Intrusive viruses Invade an existing program and actually insert a portion of themselves into the host program. Intrusive viruses are hard to write and very difficult to remove without damaging the host file.

16　The term "computer virus" came from an American science fiction "The Adolescence of P－1"