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Source: Bureau of Labor Statistics, Current Population Survey.
作者句法不错，但是文章整体句子稍微偏短；作者能较灵活地使用学术词汇，要仔细避免拼写错误；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 incovenience to people 's travel ,affect personal safety .Most imporantly ,emissions of the gas to the human body is estremely 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 advocated by bus 、bike 、walking instead of driving a car .With these methods ,i am sure our city will get cleaner .
