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In the years since the city of London imposed strict

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Re: CR- Pollution [#permalink] New post 23 May 2007, 09:23
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sidbidus 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.


One effective way to test whether an assumption is indeed one required to justify the argument is to use NEGATION method. If the logical opposite of the assumption DOESN'T weaken the argument, that assumption is not needed.

Apply it to this CR. Let's negate those answer choices:
(E) The increased sightings of bird species in and around London do not reflect an actual increase in the number of species in the area --> there's indeed no increase in the number of bird species in the area --> the regulation was ineffective --> the conclusion is weakened ---> E is a needed assumption.

(D)An increase in the number of bird species in and around a city is not desirable ---> there's no need of the regulation ---> the conclusion is weakened ---> D is a needed assumption.

(C)The air-pollution problems of other major cities are not basically similar to those once suffered by London. ---> then, how can the statement author make such suggestion on other major cities? ---> the conclusion is weekened ---> C is a needed assumption.

(B) Air-pollution regulations on industry do not have a significant impact on the quality of the air. ---> the conclusion falls apart ---> B must be a needed assumption.

(A)In most major cities, air-pollution problems are not caused almost entirely by local industry. ---> those problems are somewhat caused by local industry ---> if so, the regulation can still be imposed ---> the conclusion is not weakened ---> A is not a needed assumption.

That's why it's A.
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 [#permalink] New post 23 May 2007, 09:31
LAXIEQV, Thank you very much for the explanation
  [#permalink] 23 May 2007, 09:31
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