Computers are useful in people's lives.They can help people save much time to do much work.Today more and more(越來(lái)越多的)families have computers，but some of them don't know how to use their computers properly.Here is how：

Keep your computer in a cool place.

Make sure that the keyboard and the screen are not too high or too low for you.

Do not drink or eat when you are near your computer.Any food or water in the keyboard is bad for your computer.

Make sure the screen is not too close to your eyes.Some people use different glasses when they use computers.

Keep the screen clean and do not have it too bright(明亮的)．A dirty screen and a very bright screen are both bad for your eyes.

1.Computers are useful because ______.

A.they can do many things B.many families have computers

C.many people learn to use it D.they can bring people good health

2.How many tips(提示)does the passage talk about?

A.Three. B.Four. C.Five. D.Six.

3.What's the main idea of the passage?

A.How important the computer is. B.How to clean the house.

C.How to keep healthy. D.How to use the computers properly.

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