求一篇英语作文,120词左右,

The survey shows that many students have become shortsighted at a very young age。At present,about 70% of the students are shortsighted。Here are some main causes。Some students may not have enough sleep。Some students spend too much time reading or doing their homework without a rest。Some students even like to watch TV or use computers for a long time。In order to have good eyesight,we should do eye exercises every day。We can also try to do more sports in our spare time。We should havethe good habit of using our eyes。I think all of us should understand the importance of protecting eyes and try our best to protect them。就好,把年级近视率改改就好