[解析]
Dear Jack,
I am very glad to hear from you. In your e﹣mail, you asked me about my plan for the coming winter vacation. And I am more than happy to share it with you.(点明书信目的)
Above all, I will celebrate the Spring Festival, considered as the most important festival in China, with my family. 【高分句型一】For the big family reunion day, various activities such as having a great night feast, setting off fire works and so on, will be held to signify good wishes. We will be very honored to have you here, which is surely a good chance for you to learn more about China.【高分句型二】 And then, I as well as my parents are to make a trip to Harbin, China's northernmost major city with a well﹣deserved reputation for its bitterly cold winter. The annual Harbin International Ice and Snow Festival makes an amazing winter picture. Last and most importantly, I will review my lessons in order to make great progress in the new semester.(告知自己的寒假计划)
I can't wait to have my winter vacation. Please come and join us.(提出邀请)
Looking forward to your reply.
Yours,
Li Hua