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Source: Bureau of Labor Statistics, Current Population Survey.
作者句法知识很棒，适当增加从句的使用，会取得更不错的成绩；文中学术词汇使用熟练，在单词拼写方面要继续努力；文章结构不够严谨，应增加过程性词汇的使用。
Expanding car ownership,heavy traffic and low-grad gasoline have made autos the leading source of air pollution in major chinese.Serious pollution in big cities give some caucu for anxiety . The reasons are as follows ,first ,car technology is not mature enough ,to run the car is still rely on petrol .So a car many produce carbon dioxide and some gas pollution .Second ,carbon dioxide will destroy ozone ,the greenhouse effect .Third ,emission of gasses can cause smog caused a lot of incovenient to people 's travel ,affect personal safety .Most imporantly ,emissions of the gas to the human body is extremely bad .Long -term inhaled the gas may cause respivatory tract obstruction and fat carcinoma . As far as I am concerned ,on the one hand ,we should improve the technical implementation of solar energy instead of gasoline .On the other hand ,we should be advocated by bus 、bike 、walking instead of driving a car .With these methods ,I am sure our city will get cleaner .
