2017届高考英语一轮复习必备单词素材：Unit 9 Wheels（北师大版）_高考复习指南

　　D．limit the spread of smog

　　解析：选A　细节理解题。根据第二段中的“...but groundlevel ozone is ... damage to crops and forest.”可知，地平面上的臭氧对环境和人体是有坏处的。故选A。

　　9．Which of the following is TRUE according to the passage?

　　A．Air quality is better in time of calm wind.

　　B．Smog is more severe near pollution sources.

　　C．It takes more time for smog to form in hot weather.

　　D．Chemical reactions occur in the moving air and cause smog.

　　解析：选D　正误判断题。根据第三段最后一句中的“because the chemical reactions ... by the wind”可知，化学反应在流动的空气里发生并且导致了烟雾。故选D。

　　10．Which indication shows more exact the air is poor?

　　A．Heavy motor vehicle traffic in big cities.

　　B．Widespread damage of crops and forest.

　　C．Clear outlines of hills in the distance.

　　D．High concentrations of pollutants in the air.

　　解析：选D　细节理解题。根据第四段最后一句可知，空气中高浓度的污染物能较准确地表明空气质量差。故选D。

　　11．What is included in the measures being taken by the local governments?

　　A．Unconditional banning of wood burning.

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