求一份计算机病毒种类简介的英文稿 口语考试用！

可以分段选择你适合的部分,希望对你有帮助.口语考试你要make sure考官懂得基本的计算机术语,如果不清楚(大部分国际性英语口语考试考官都懂的,如IELTS或TOEFL考官),还是避免提到术语, 可以用通俗的语言表达,或者给他metaphor,如用感冒病毒来比喻 :) Good luck with your exam!

A computer virus is a program designed to spread itself by first infecting executable files or the system areas of hard and floppy disks and then making copies of itself. Viruses usually operate without the knowledge or desire of the computer user.

When you execute program code that's infected by a virus, the virus code will also run and try to infect other programs, either on the same computer or on other computers connected to it over a network . And the newly infected programs will try to infect yet more programs.

When you share a copy of an infected file with other computer users, running the file may also infect their computers; and files from those computers may spread the infection to yet more computers.

Viruses are software programs, and they can do the same things a