如果你的名字叫唐佳,你的朋友Tom给你来信,问你当地的天气,他想知道清明节的由来或习俗（不少于80字）

Dear Tom,I am writing to tell you about Qingming Festival in such a fine weather.The Qingming (Pure Brightness) Festival is one of the 24 seasonal division points in China,falling on April 4-6 each ye...