Question

一篇英语阅读理解On May 21,1999,some American scientists were working

Answer 1

1.Computer virus

2.This virus attacks the computer and lowers the important functions ,damages their programs,gets rid of information which is used and stored by the user.

3.have fun

4.Even worse,it still can reproduce itself in great quantities within a short time.

5.你没有把划线句子标出来.