大全-B-2 补遗！

assfgrtrtr

In the years since the city of London imposed strict air-pollution 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, air-pollution problems are caused almost entirely by local industry.

(B) Air-pollution 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.

看了以前的帖子，发现没有讨论B的。

我觉得B中，air quality是一个无关的概念。空气质量和鸟类回归在文中没有关联？

assfgrtrtr

比如，某种物质对只有鸟类很敏感，该物质多了并不造成空气污染。否定了B，结论依然成立！为什么还说是结论？

引大牛的言论：

答案为A。almost entirely 太STRONG。air-pollution problems 太泛。对空气污染限制什麽，限制多少原文是不清楚的，所以不必有假设说污染几乎都是本地工业引起的。比如说对鸟伤害最厉害的是某种物质，就说SO2（二氧化硫），L是限制了它的排放使鸟数量增加，但二氧化硫却不是空气污染（air-pollution problems ）的主要原因。在这种情况下，否定了A，结论一样能成立。