Another type of smog occurs in Los Angeles.Here the weather may be clear and sunny.But stinging eyes and dry coughs show that harmful chemicals fill the air.The smog is due to invisible gases, mostly from automobile exhaust.Because these chemicals are changed by the sun high up in the air, it is called photochemical smog.It contains automobile exhaust fumes and nitrogen oxides changed by the sun's rays.Added to these are sulfur dioxide and other fumes from factories and oil refineries.Photochemical smog is found in many large cities all over the world.
Killer smogs don't happen very often, fortunately.But in Beijing, a combination of automobile exhaust fumes, home furnace smoke, and factory waste gases pours into the air.This may also happen in the suburbs, or out in the country, where large factories have been built.A number of harmful substances have been found in the air there.When these substances are breathed in day after day, the health of the population is affected.
【语篇解读】 伦敦、纽约、洛杉矶和北京四个大城市曾经经历和正在经历的空气污染虽然有些许不同但是都对人类的生活产生了极大的危害。
?
B.It can affect the health.
C.It can kill people.
D.It is too thick for people to see something.
答案 D [细节理解题。根据第一段第三句中的“it was so hard to see that people had to walk in front of the buses to guide them”可知答案为D
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