Smog is a visible example of air pollution. You can look into the distance during the day to see how much smog there is in the air. In addition, most cities measure the concentrations of pollutants in the air and report the results to the public.

　　Environmental Protection Agency sets national standards for pollutants. Areas that fail to meet the standards for at least one air pollutant are called “nonattainment (不达标) areas”. New measures are being taken by local governments across the country to reduce air pollution in nonattainment areas. These include: banning charcoal barbecues and wood burning in stoves or fireplaces when pollution levels are high; developing programs to encourage carpooling and voluntary “ozone actions”； limiting traffic in overcrowded areas; expanding or improving public transportation systems; requiring employers to contribute to employee public transportation costs; assessing “smog fees” on cars according to the number of miles driven and vehicle emissions (排放) produced; and even buying and breaking up older “super­dirty” cars.

　　语篇解读：本文是一篇说明文。文章主要谈论了烟雾的形成原因、危害以及地方政府针对这一现象所采取的应对措施。

　　1．According to the passage, ground­level ozone can______.

　　A．damage the environment

　　B．benefit human health

　　C．protect crops and forest

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