阅读理解。 A computer is a machine.Many peop

题目：

阅读理解。

　　A computer is a machine.  Many people use computers to help them do better work.  But sometimes

people send computer viruses(病毒) to computers. A computer virus is a set of bad instructions written

just to hurt computers.

　　Someone makes the virus and sends it to other computers. It is set (被设置) to turn on by itself.  

When it does, many computers around the world begin to have problems.

When the virus is turned on, it makes the computer do things it is not supposed to do. A lot of useless

information starts getting into the computers. Sometimes people lose things that are very important because

of viruses.

　　People have to turn off their computers. Others stop their computers so that they won't get hurt. by 

other computers. The virus is spread(传播)when people send information to others. Once in the computer,

it. Tells the computer to do bad things.

1. People use computers because _____.

A. computers are easy to use

B. everyone has to buy one

C. computers help people do better work

D. computers are interesting

2. What is a computer virus?

A. It's something that a person gets.

B. It's a program that hurts computers.

C. It's a bad letter that. is sent to people.

D. kind a kind of useful information.

3. What happens when a virus gets into a computer?

A. The computer turn on and off .

B. Useless information starts getting into it.

C. It can make the computer work well.

D. It can spread much good information.

4.  Why do some people have to turn off their computers?

A. They don't want to send e-mails.

B. They don't want to get sick.

C. They don't want to get a computer virus.

D. They want to make the computer turn on by itself.

5. What's the best title for the passage?

A. Computer Viruses      

B. A New Project

C. Modern Computers      

D. Computers and Information