Question

2．There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic．At present，we realize that although these are the areas with the worst air pollution，the problem is actually worldwide．On several occasions over the past decade，a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile traffic．In fact，the very climate of the entire earth may be infected by air pollution．Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of coal and oil is creating a"greenhouse effect"．If this view is correct and the world's temperature is raised only a few degrees，much of the polar ice cap will melt and cities such as New York，Boston，Miami，and New Orleans will be in water．
Another view，less widely held，is that increasing particular matter in the atmosphere is bloc-king sunlight and lowering the earth，s temperature-a result that would be equally disastrous．A drop of just a few degrees could create something close to a new ice age，and would make agriculture difficult or impossible in many of our top farming areas．Today we do not know for sure that either of these conditions will happen （ though one recent government report drafted by experts in the field concluded that the greenhouse effect is very possible）．Perhaps，if we are lucky enough，the two tendencies will offset each other and the world's temperature will stay about the same as it is now．Driven by economic profits，people neglect the damage on our environment caused by the"advanced civilization"．Maybe the air pollution is the price the human beings have to pay for their development．But is it really worthwhile？
64．At the beginning of the passage，the writer tells us that air pollutionC
A．caused widespread damage in the countryside
B．had bad effects on people's health in the city
C．existed merely in urban and industrial areas
D．affected the entire eastern half of the United States
65．The word"offset"in the second paragraph could be replaced byA
A．make up for 
B．slip into   
C．catch up with   
D．set up
66．It can be concluded thatD
A．almost no temperature changes have occurred over the past decade
B．the world's temperature will remain constant in the years to come
C．raising the world's temperature only a few degrees would not do much harm to life on earth
D．lowering the world's temperature merely a few degrees would lead major farming areas to disaster
67．This passage is mainly aboutB
A．the greenhouse effect   
B．the potential effect of air pollution
C．the burning of fossil fuels 
D．the likelihood of a new ice age．

Answer 1

分析 本文属于说明文阅读，作者通过这篇文章向我们说明了空气污染的潜在影响．并且提出了这样一个问题：如果人类文明的进步要以空气被污染为代价，这是否值得．

解答 64．C  细节理解题，根据第一段There was one thought that air pollution affected only the area immediately around large cities with factories and heavy traffic可知在文章的开头，作者告诉我们空气污染仅存在于城市和工业领域，故选C．
65．A  词义猜测题，根据第二段and the world's temperature will stay about the same as it is now．可知offset意思是抵消，故选A．
66．D  细节理解题．根据第二段"A drop of just a few degrees could create something close to a new ice age，and would make agriculture difficult or impossible in many of our top farming areas"可知如果世界气温降低几度这将导致主要农业地区的灾难；故选D．
67．B  主旨大意题，通读全文可知这篇短文主要讲了空气污染的潜在影响，故选B．

点评 考查学生的细节理解和推理判断能力．做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确选择．在做推理判断题时不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．