假如你是中学生李华，你的美国朋友Jack在上次给你的电子邮件中抱怨自己最近眼睛近视了。请你给他用英语回一封电子邮件，内容如下：
1、介绍一下你们班同学的情况；
2、分析一下造成你们班这种情况的原因：
3、帮Jack出点儿保持眼睛健康的主意。
注：1、字数120—150：邮件的开头和结尾已为你写好。
2、近视：shortsighted adj. shortsightedness n.
Dear Jack,
_________________________________________________________________________
Yours sincerely
Li Hua
Dear Jack,
I'm sorry to hear that you are suffering from shortsightedness too.
To be frank, almost eight students out of ten in my class have to wear glasses in order to live a normal school life, including me myself. As far as I'm concerned, many factors contribute to this phenomenon. First, we Chinese students live under a great burden, a burden of examinations. You know, we have to fight our way in life with millions of peers. Second, most of us with shortsightedness don't have a good habit of using our eyes, either due to lack of knowledge or carelessness.
In this case, 1 strongly recommend that you should not use your computer for that long a time any more and that you should change your habit of reading in bed. Hopefully, your shortsightedness could be corrected by wearing proper glasses.
All in all, don't worry! It's no big deal. （149 words）
Yours sincerely
Li Hua