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  3. People who live in heavily industrialized areas do not get as much sunlight as they should. Dust【1】over a city at altitudes (海拔)

People who live in heavily industrialized areas do not get as much sunlight as they should. Dust【1】over a city at altitudes (海拔)

admin2013-04-06  104
问题     People who live in heavily industrialized areas do not get as much sunlight as they should. Dust【1】over a city at altitudes (海拔) of between 4,000 and 8,000 feet cuts out between 20 and 50 percent of the sunlight and up to 90 percent of the ultraviolet light (紫外线). But dust is not the only thing to【2】about. When fuels are burned, whether in a factory, or in a home, or in the engine of a car, CO2 is given off.
    CO2 in the atmosphere acts as a kind of 【3】around the earth, keeping warms in and so slowly raising the【4】of the earth. This could really change the climate all over the world.
    Everybody wants to have a car.【5】, while they are giving us so much pleasure, cars are also poisoning us. The amount of dangerous substances sent out by a car is quite【6】. Did you know, for example, that a hundred cars produce on【7】a third of a ton of CO, as well as many other【8】substances every day?
    Now, more and more people are realizing the importance of clean air. Schools are now teaching about the pollution problems. Scientists and engineers are trying to【9】new engines for cars. But what about the millions of cars already in use? Must they all be dirown away? It might be very【10】to change them so that they, too, are pollution-free.
A. forge B. screen C. expensive D. floating
E. unfortunately F. average G. poisonous H. develop
I. temperature J. surprising K. overtaking L. essential
M. regulation N. generously O. worry
【2】
选项
答案O
解析 此处应为动词，可与about搭配为动词词组。结合上一句，可以推断作者想表达灰尘并不是唯一令人担忧的东西，因此答案为worry。
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