[解析]
Dear John，
Thanks for your letter． It was great to hear from you． You asked me about the weather in my hometown． Well， I'd like to tell you about the smog that we've being suffering【高分句型一，that引导定语从句】．【要点一，提出话题】
Since the winter last year， the smog has occurred several times， which has done great harm to us【高分句型二，which引导非限制性定语从句】． Several traffic accidents have happened as a result of the heavy smog weather； there are an increasing number of people who have to go to see a doctor about the serious illnesses， especially breathing problems， caused by the smog【高分句型三，who引导定语从句】． What's more， primary schools and middle schools have been shut to avoid exposing students to smog．【要点二，介绍情况】
I feel depressed and worried． However， the harm and the importance of protecting the environment have been appreciated． We are taking measures to reduce the smog weather． More trees are being planted and vehicle restriction is adopted． Would you like to tell me some good ideas？【要点三，提出建议】
I'm looking forward to your reply．
Yours Li Hua
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