a q from 大全/大全-B-2

zjw007 · 发表于 2004-2-13 19:00:00

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.??（A）
(E) The increased sightings of bird species in and around London reflect an actual increase in the number of species in the area.
why A is correcot? anybody can explain? Thanks...

dorbear · 发表于 2004-2-15 11:55:00

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.
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If you mean why (A) is the answer here, that is because A is the only one that is not the assumption required for this argument to be hold. Two things about (A) make it the EXCEPTION we are looking for:

(1) "In most cities": we are talking about "some other cities", they are not necessarily to be the mojorities.

(2) "almost entirely by local industry": Local industry is probably a factor resulting air pollution, but this term goes too far beyond warranted, that is, there are likely to be some other problems bigger than this one, we have no idea.

a q from 大全/大全-B-2

a q from 大全/大全-B-2

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