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# In the years since the city of London imposed strict

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In the years since the city of London imposed strict [#permalink]

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03 May 2008, 01:38
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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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03 May 2008, 04:45
answer is C..all others seem valid
what is the OA
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04 May 2008, 00:26
This was posted recently. OA is A.
prasannar wrote:
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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04 May 2008, 08:01
A. Even if local industry has small impact on the quality of air, it can be big enough to decrease number of bird species. Therefore, it's not an assumption.
B. If air-pollution regulations does not have significant impact, number of bird species won't increase due to changes in these regulations.
C. If air-pollution problems are not similar (for example, the city doesn't have industry at all), changes in air-pollution regulations can be ineffective.
D. If you do not want to something, do not do it
E. If number of sightings doesn't reflect number of bird species, we can't evaluate regulations' efficiency.
Re: CR: Air Pollution   [#permalink] 04 May 2008, 08:01
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