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Dear Bill,
I'm glad your letter. Thank you for for the weather and my health. But I am sorry to tell you that I have to stay at home because of the heavy fog and haze(雾霾).
Since the winter last year, the fog and haze a lot of times. It has done great harm to our daily life. Many traffic accidents . More and more people were ill and the doctor said the serious diseaseby the fog and haze, quite a lot of flights have to be off , and a great number of people have to stay at home for fear of the poisonous(有毒的) air.
According to the Chinese Academy of Science, driving cars and coals are two main reasons. People have been told: don't do outdoor sports. If you have to go out, wear a mask(口罩); wash your face and clean your nose as soon as you get home.
People the importance of protecting environment. The government suggest everyone to work or school with the public traffic, such as the bus and the underground. Also we more trees.
Yours,
Li Hua