Unit 2 Working the land
if you want to protect your eyesight, you must pay attention to the following points.
firstly, you should not keep your eyes working long time.after you have studied for a long time, about an hour or so, you’d better have a rest by looking in the long distance.secondly, you should keep your book about a foot away from your eyes when you read it. you should also keep in mind, “ don’t read in a dim light or in the sun; don’t read in the moving bus or in bed.” doing eye-exercises will help you keep good eyesight.
if you fail to keep these rules, you will become
short-sighted sooner or later.