保护视力（protect your eyesight）
　　how to protect your eyesight it is important for everyone to keep good eyesight. but do you know how to protect your eyesight?first, don＇t keep your eyes working for a long time. you＇d better have a rest by looking in the long distance after you have studied an hour or so.second, pay attention to the following: don＇t read in the sun or in a poor light; don＇t read in bed or in a moving bus. and when you read you should keep the book away from your eyes for about a foot.and third, do eye-exercises every day. it will also help you keep good eyesight.if you obey the rules above, i think, you may prevent your eyesight from becoming short-sighted.