Many young people use computers, but few of them know how to look after them. Remember the following when you use your computer.
◆Keep your computer in a cool room. Too much or too little heat is bad for computers. Most computers work best at a temperature of 5 ºC—30 ºC.
◆Don’t let people smoke cigarette(香烟）near your computer. Smoke of all kinds is very bad for many parts of a computer and can cause many problems.
◆Don’t eat or drink when you are near your computer. Pieces of food and a little water in the keyboard can also cause many problems.
◆Make sure the screen is the correct distance from your eyes. If you wear glasses, make sure these glasses are correct for using with the computer. Some people use a different pair of glasses when they use a computer.
◆Keep your screen clean and don’t have it too bright. A dirty screen can hurt your eyes. A very bright screen can also be bad for your eyes.
According to the passage you should use your computer           .

A．in a small room	B．in a big room
C．in a cool room	D．below 5ºC

When you work on the computer, you can             .

A．wear glasses	B．smoke cigarette
C．eat some hamburgers	D．clean the keyboard with water

If you want to look after your eyes, you should             when you use computers.

A．buy a pair of sunglasses	B．keep your screen clean
C．have your screen very bright	D．keep your screen near your eyes