Many young people use computers，but few of them know how to look after them．Remember the following tips（小貼士） when you use your computer．
   ?Keep your computer in a cool，dry room．（1）

B

B

Moisture （潮濕） is also bad for them．Most computers work best at a temperature of 5℃-30℃．
   ?（2）

E

E

Smoke of all kinds is very bad for many parts of a computer and can cause many problems．
   ?（3）

C

C

Pieces of food and even a little water in the keyboard can also cause many problems．
   ?Make sure that the keyboard and screen （屏幕） are the correct height （高度） for you．（4）

D

D

   ?Make sure the screen is the correct distance （距離） from your eyes．If you wear glasses，make sure these glasses are correct for using the computer．（5）

A

A

   ?Keep your screen clean and don't make it too bright．A dirty screen can hurt your eyes．A very bright screen can also be bad for your eyes．

將下列句子的序號(hào)填在橫線上，使短文完整．
A．Some people use a different pair of glasses when they use a computer．
B．Too much or too little heat （熱量） is bad for computers．
C．Don't eat or drink when you are near your computer．
D．If they are not the correct height，you will get a backache．
E．Don't let people smoke near your computer．