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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## Bird species around London tagged by: ##### This topic has 2 expert replies and 3 member replies ## Bird species around London 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 ot 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. Senior | Next Rank: 100 Posts Joined 12 Jun 2008 Posted: 60 messages Upvotes: 2 ### Top Member Moderator Joined 15 Oct 2017 Posted: 1108 messages Followed by: 5 members Hello, I don't have it very clear. Can any expert explain to me please! Thanks ### GMAT/MBA Expert GMAT Instructor Joined 04 Oct 2017 Posted: 551 messages Followed by: 11 members Upvotes: 180 At the risk of being obvious, this is a NOT question. You want the choice that is NOT an assumption. Now . . . The conclusion: Similar air-pollution rules should be imposed in other major cities. (The word "should" is usually found in conclusions.) The evidence: 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. There are a number of assumptions being made here, four of which are in the choices. Choice B is an assumption because if air-pollution regulations on industry do not have a significant impact on the quality of the air, then something else was responsible for the bird uptick, and so, NO, one should not impose the rules on other cities. Choice C is an assumption because if the air-pollution problems of other major cities are NOT basically similar to those once suffered by London, then the plan to impose the rules on other cities is pointless. Choice D is an assumption because if the increase in bird species is NOT desirable, then why try to export the plan? Choice E is an assumption because if the increased sightings of bird species in and around London DOES NOT reflect an actual increase in the number of species in the area, the regulations did not cause a change. The plan to try the regulation out elsewhere is pointless. But Choice A doesn't need to be assumed. This choice uses the word "most" -- "most cities." This does not need to be assumed -- maybe in 50% of cities, air-pollution problems are caused almost entirely by local industry. The plan is still reasonable. Also, do the air problems have to be "almost entirely" caused by local industry? What if local industry was a relatively minor factor in air quality? The regulations might still have been enough to help the birds, and the conclusion still stands. The author of this argument does NOT need to assume what Choice A says. _________________ GMAT Prep From The Economist We offer 70+ point score improvement money back guarantee. Our average student improves 98 points. Free 7-Day Test Prep with Economist GMAT Tutor - Receive free access to the top-rated GMAT prep course including a 1-on-1 strategy session, 2 full-length tests, and 5 ask-a-tutor messages. Get started now. ### GMAT/MBA Expert GMAT Instructor Joined 04 Oct 2017 Posted: 551 messages Followed by: 11 members Upvotes: 180 I'm available if you'd like any follow up. _________________ GMAT Prep From The Economist We offer 70+ point score improvement money back guarantee. Our average student improves 98 points. Free 7-Day Test Prep with Economist GMAT Tutor - Receive free access to the top-rated GMAT prep course including a 1-on-1 strategy session, 2 full-length tests, and 5 ask-a-tutor messages. Get started now. Newbie | Next Rank: 10 Posts Joined 24 Aug 2017 Posted: 4 messages Target GMAT Score: 730 EconomistGMATTutor wrote: At the risk of being obvious, this is a NOT question. You want the choice that is NOT an assumption. Now . . . The conclusion: Similar air-pollution rules should be imposed in other major cities. (The word "should" is usually found in conclusions.) The evidence: 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. There are a number of assumptions being made here, four of which are in the choices. Choice B is an assumption because if air-pollution regulations on industry do not have a significant impact on the quality of the air, then something else was responsible for the bird uptick, and so, NO, one should not impose the rules on other cities. Choice C is an assumption because if the air-pollution problems of other major cities are NOT basically similar to those once suffered by London, then the plan to impose the rules on other cities is pointless. Choice D is an assumption because if the increase in bird species is NOT desirable, then why try to export the plan? Choice E is an assumption because if the increased sightings of bird species in and around London DOES NOT reflect an actual increase in the number of species in the area, the regulations did not cause a change. The plan to try the regulation out elsewhere is pointless. But Choice A doesn't need to be assumed. This choice uses the word "most" -- "most cities." This does not need to be assumed -- maybe in 50% of cities, air-pollution problems are caused almost entirely by local industry. The plan is still reasonable. Also, do the air problems have to be "almost entirely" caused by local industry? What if local industry was a relatively minor factor in air quality? The regulations might still have been enough to help the birds, and the conclusion still stands. The author of this argument does NOT need to assume what Choice A says. I truly cannot understand your explanation of choice E being a wrong answer, and choice A being the correct answer. • Free Veritas GMAT Class Experience Lesson 1 Live Free Available with Beat the GMAT members only code • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Award-winning private GMAT tutoring Register now and save up to$200

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