请教斑竹大全-b-2

大全-B-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 LACE w:st="on">LondonLACE>.

(D) An increase in the number of bird species in and around a city is desirable.（A）