2. 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. 为什么答案是A？谢谢大家

Impose strict air-pollution regulations on local industry --> bird species increase

Therefore, no matter how serious the air-pollution caused by local industry, impose the law can increase the bird species. Instead, other cities should have the same air-pollution situation like London, as choice C states. So choice A is an unnecessary assumption.

It's my 2 cents, any imputs are welcome!!