9.
选词填空
|
A. different B. be harmful C. distance D. afford
E. be careful
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Make sure that the keyboard and the screen
are in the right height for you. If they are not, you will get a backache.
Make sure the screen is in the correctfrom
your eyes. If you wear glasses, make sure these glasses are suitable for using
the computer. Some people use apair of glasses when they use a computer.
Keep your screen clean and do not have it
too bright. A dirty screen can hurt your eyes. A very bright screen can also be
bad for your eyes. If you canone, buy a computer screen. It will be
better for you than using the screen of a TV set.
When you use any software, you mustbecause
some software can cause viruses in the computer. If your computer has viruses,
it won't work or might even break down.