题目： In the years since the city of London imposed strict airpollution regulations on local industry, the number of bird species seen in and around London has increased dramatically. Similar air-pollution rules should be imposed in other major cities. Each of the following is an assumption made in the argument above EXCEPT: (A) In most major cities, airpollution problems are caused almost entirely by local industry. (B) Airpollution regulations on industry have a significant impact on the quality of the air. (C) The air-pollution problems of other major cities are basically similar to those once suffered by London. (D) An increase in the number of bird species in and around a city is desirable. (E)The increased sightings of bird species in and around London reflect an actual increase in the number of species in the area. 答案里说正确选项应该是A，我自己做了觉得应该是B，因为文中没有提到quality of air，希望大家帮忙看看，谢谢了！
作者: zhykzdlgw 时间: 2012-10-7 16:23
我感觉B是可以推出来的:because quality of air is improved, the number of birds in London has improved既然鸟多了，说明空气好了 A不行，不能推断出大部分空气污染都是工业产生的 PSZ有这个内容的链接吗？作者: Zhouxiayiding 时间: 2012-10-10 10:13
是这里下的资料~ http://forum.chasedream.com/GRE_Material/thread-688880-1-1.html
Z有这个内容的链接吗？