假定你是李华，你的美国笔友John来信请你介绍中国传统节日清明节。请根据以下要点，用英语给他写封回信。
要点:1. 清明节是二十四节气之一;
2. 全国放假三天;
3. 扫墓祭祖踏青游玩、放风筝等。
注意:1. 词数100左右;
2. 可适当增加细节,以使行文连贯;
3. 开头和结尾已为你写好,但不计人总词数。
参考词汇:节气solar term 扫墓sweep the tomb
Dear John ,

Glad to hear from you. I'd like to tell you something about the Qingming Festival.

____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
___________________________________________________________________________________

Best wishes !

Yours ,

Li Hua