Mosquitoes

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DanaJ: Site Admin; Posts: 2567; Joined: Thu Jan 01, 2009 10:05 amFollowed by: 550 members; Thanked: 712 times; GMAT Score:770

by DanaJ » Tue Dec 07, 2010 10:47 am

2Unlike high elevations, where mosquitoes don't carry dangerous illnesses, the mosquitoes at the lower elevations of Ethiopia can carry malaria and yellow fever.

(A) Unlike high elevations, where mosquitoes don't carry dangerous illnesses, the mosquitoes at the lower elevations of Ethiopia

(B) Unlike the dangerous illneses not carried by mosquitoes at the higher elevations of Ethiopia, the mosquitoes at the lower elevations of Ethiopia

(C) At the high elevations of Ethiopia, mosquitoes don't carry dangerous illnesses, but at the low elevations of Ethiopia, mosquitoes

(D) Unlike those of the high elevations, where mosquitoes don't carry serious illnesses, many lower elevation mosquitoes

(E) In comparison with the high elevations, whose mosquitoes don't carry serious illnesses, the mosquitoes in the lower elevations of Ethiopia

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Source: Beat The GMAT — Sentence Correction | Tue Dec 07, 2010 10:47 am

kapur.arnav: Master | Next Rank: 500 Posts; Posts: 126; Joined: Mon Jul 19, 2010 9:36 am; Thanked: 6 times

by kapur.arnav » Tue Dec 07, 2010 11:06 am

DanaJ wrote:2Unlike high elevations, where mosquitoes don't carry dangerous illnesses, the mosquitoes at the lower elevations of Ethiopia can carry malaria and yellow fever.

(A) Unlike high elevations, where mosquitoes don't carry dangerous illnesses, the mosquitoes at the lower elevations of Ethiopia

(B) Unlike the dangerous illneses not carried by mosquitoes at the higher elevations of Ethiopia, the mosquitoes at the lower elevations of Ethiopia

(C) At the high elevations of Ethiopia, mosquitoes don't carry dangerous illnesses, but at the low elevations of Ethiopia, mosquitoes

(D) Unlike those of the high elevations, where mosquitoes don't carry serious illnesses, many lower elevation mosquitoes

(E) In comparison with the high elevations, whose mosquitoes don't carry serious illnesses, the mosquitoes in the lower elevations of Ethiopia

C is the best answer... rest all can be eliminated because of parallelism and comparison issues

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sanabk: Master | Next Rank: 500 Posts; Posts: 174; Joined: Fri Apr 02, 2010 3:41 pmFollowed by: 1 member; Thanked: 6 times

by sanabk » Tue Dec 07, 2010 1:24 pm

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ikaplan: Master | Next Rank: 500 Posts; Posts: 181; Joined: Fri Sep 04, 2009 12:06 pmFollowed by: 1 member; Thanked: 17 times

by ikaplan » Wed Dec 08, 2010 3:37 am

E incorrectly compares high elevations to mosquitoes

D has problem with ||

B incorrectly compares 'illness' with mosquitoes + passive voice

A has problem with ||

IMO- C is the correct answer

"Commitment is more than just wishing for the right conditions. Commitment is working with what you have."

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David@VeritasPrep: GMAT Instructor; Posts: 2193; Joined: Mon Feb 22, 2010 6:30 pmFollowed by: 512 members; Location: Vermont and Boston, MA; Thanked: 1186 times; GMAT Score:770

by David@VeritasPrep » Fri Dec 10, 2010 5:28 pm

Nice work guys!

You are correct the OA is C.

Correct answer: (C)

Solution: Answer (C) is correct because it corrects the Equivalent Elements error in the original sentence, which compares high elevations to mosquitoes at lower elevations. (C) uses two independent clauses joined by a conjunction ("but") to make the comparison between mosquitoes at high elevation and mosquitoes at low elevation clear and logical. Answer (B) is incorrect because it maintains the Equivalent Elements error, comparing dangerous illnesses to mosquitoes. Answer (D) is incorrect because it compares high elevations to mosquitoes. Answer (E) also contains a problematic comparison because it relates high elevations to mosquitoes.

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missionGMAT007: Master | Next Rank: 500 Posts; Posts: 135; Joined: Sat Jun 20, 2009 10:59 am; Thanked: 4 times

by missionGMAT007 » Fri Dec 10, 2010 10:41 pm

David@VeritasPrep wrote:Nice work guys!

You are correct the OA is C.

Correct answer: (C)

Solution: Answer (C) is correct because it corrects the Equivalent Elements error in the original sentence, which compares high elevations to mosquitoes at lower elevations. (C) uses two independent clauses joined by a conjunction ("but") to make the comparison between mosquitoes at high elevation and mosquitoes at low elevation clear and logical. Answer (B) is incorrect because it maintains the Equivalent Elements error, comparing dangerous illnesses to mosquitoes. Answer (D) is incorrect because it compares high elevations to mosquitoes. Answer (E) also contains a problematic comparison because it relates high elevations to mosquitoes.

I have selected D.

(D) Unlike those of the high elevations, where mosquitoes don't carry serious illnesses, many lower elevation mosquitoes

I assumed that the 'those' in the option B refers to mosquitoes and thus makes the parallelism.
Can you please explain?

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ikaplan: Master | Next Rank: 500 Posts; Posts: 181; Joined: Fri Sep 04, 2009 12:06 pmFollowed by: 1 member; Thanked: 17 times

by ikaplan » Fri Dec 10, 2010 11:57 pm

Hi missionGMAT007,

You should almost never assume on SC questions- instead, try to identify whether it is clear to which word does the personal pronoun refer to. In some cases, a personal pronoun can refer to two words- therefore, be suspicious about that answer choice and keep it as a 'looser'. Then, go on and search for the 'contender'.

In the SC problem we have discussed before, the word "those" does not have a clear antecedent. Ask yourself, is it clear to whom 'those' refers to?

Even if you assume that 'those' refers to the 'mosquitoes' (which you should almost never do, but anyway) you can also see a problem with parallelism- "those of high elevations" and "lower elevation mosquitoes".

"Commitment is more than just wishing for the right conditions. Commitment is working with what you have."

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mundasingh123: Legendary Member; Posts: 2330; Joined: Fri Jan 15, 2010 5:14 amFollowed by: 26 members; Thanked: 56 times

by mundasingh123 » Sat Dec 11, 2010 12:38 am

DanaJ wrote:2Unlike high elevations, where mosquitoes don't carry dangerous illnesses, the mosquitoes at the lower elevations of Ethiopia can carry malaria and yellow fever.

(A) Unlike high elevations, where mosquitoes don't carry dangerous illnesses, the mosquitoes at the lower elevations of Ethiopia

(B) Unlike the dangerous illneses not carried by mosquitoes at the higher elevations of Ethiopia, the mosquitoes at the lower elevations of Ethiopia

(C) At the high elevations of Ethiopia, mosquitoes don't carry dangerous illnesses, but at the low elevations of Ethiopia, mosquitoes

(D) Unlike those of the high elevations, where mosquitoes don't carry serious illnesses, many lower elevation mosquitoes

(E) In comparison with the high elevations, whose mosquitoes don't carry serious illnesses, the mosquitoes in the lower elevations of Ethiopia

Hi DanaJ Thanks for posting such nice questions for practice . It would be helpful if you mention the source with the question.This way i will be able to avoid doing GMATPREP and MGMAT CAT questions as i am a man of limited means and cant afford to buy lots of materials.

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