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.
7.Which indication shows more exactly 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.
8.What is included in the measures being taken by the local governments?
A.Unconditional banning of wood burning.
B.Encouraging carpooling and public transportation.
C.Charging all the vehicles more “smog fees”.
D.Buying new cars to replace superdirty old cars.
答案:
解题导语: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。
5.A 解析: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项。
6.D 解析:判断正误题。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项。
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