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．a(chǎn)ffected 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．a(chǎn)lmost 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 本文屬于說明文閱讀，作者通過這篇文章向我們說明了空氣污染的潛在影響．并且提出了這樣一個(gè)問題：如果人類文明的進(jìn)步要以空氣被污染為代價(jià)，這是否值得．

解答 64．C  細(xì)節(jié)理解題，根據(jù)第一段There was one thought that air pollution affected only the area immediately around large cities with factories and heavy traffic可知在文章的開頭，作者告訴我們空氣污染僅存在于城市和工業(yè)領(lǐng)域，故選C．
65．A  詞義猜測(cè)題，根據(jù)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，故選A．
66．D  細(xì)節(jié)理解題．根據(jù)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"可知如果世界氣溫降低幾度這將導(dǎo)致主要農(nóng)業(yè)地區(qū)的災(zāi)難；故選D．
67．B  主旨大意題，通讀全文可知這篇短文主要講了空氣污染的潛在影響，故選B．

點(diǎn)評(píng) 考查學(xué)生的細(xì)節(jié)理解和推理判斷能力．做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確選擇．在做推理判斷題時(shí)不要以個(gè)人的主觀想象代替文章的事實(shí)，要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷．