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Most efforts to combat such mosquito-borne diseases like

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Most efforts to combat such mosquito-borne diseases like [#permalink]

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The Official Guide for GMAT Review 2017

Practice Question
Question No.: SC 796
Page: 708

Most efforts to combat such mosquito-borne diseases like malaria and dengue have focused either on the vaccination of humans or on exterminating mosquitoes with pesticides.

A and dengue have focused either on the vaccination of humans or on exterminating
B like malaria and dengue have focused either on vaccinating of humans or on the extermination of
C as malaria and dengue have focused on either vaccinating humans or on exterminating
D as malaria and dengue have focused on either vaccinating of humans or on extermination of
E as malaria and dengue have focused on either vaccinating humans or exterminating
[Reveal] Spoiler: OA
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macjas wrote:
Most efforts to combat such mosquito-borne diseases like malaria and dengue have focused either on the vaccination of humans or on exterminating mosquitoes with pesticides.

A and dengue have focused either on the vaccination of humans or on exterminating
Incorrect: "vaccination" and "exterminating" are not parallel

B like malaria and dengue have focused either on vaccinating of humans or on the extermination of
Incorrect: "vaccinating" and "extermination" are not parallel. Also, I think the proper idiomatic phrase is "such . . . as" as opposed to "such . . . like"

C as malaria and dengue have focused on either vaccinating humans or on exterminating
Incorrect: the "on" before exterminating is kind of wordy because "on either" implies that the "on" carries over to both "vaccinating" and "exterminating"

D as malaria and dengue have focused on either vaccinating of humans or on extermination of
Incorrect: "vaccinating" and "extermination" are not parallel

E as malaria and dengue have focused on either vaccinating humans or exterminating

Correct: Proper idiomatic phrase is used "such . . .as", and "vaccinating" and "exterminating" are parallel
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This is essentially a test of 1. the use of such as versus like 2. the parallelism of the coordinate conjunction either--- or and 3 the parallelism of a participle or gerund and noun

A like malaria and dengue have focused either on the vaccination of humans or on exterminating--- like can not be used to mark examples

B like malaria and dengue have focused either on vaccinating of humans or on the extermination of----use of like is wrong

C. as malaria and dengue have focused on either vaccinating humans or on exterminating--- either vaccinating humans or on exterminating---wrong parallelism of either ---or coordinate conjunction; on the right hand side of both either and or, similar structure should be used

D as malaria and dengue have focused on either vaccinating of humans or on extermination of----- either vaccinating of humans or on extermination of --- bad co-ordinate conjunction parallelism.

E as malaria and dengue have focused on either vaccinating humans or exterminating --- proper uaw of either or parallelism. Correct choice.

Now let us take choice B. We rejected it primarily because of the uses of like. However, how about either or parallelism? It is perfectly parallel because of the use of the pronoun on the right hand side of both either and or.

What about vaccinating of and extermination of—this is also perfectly parallel because vaccinating of is a gerund and is as good as extermination of in structure.
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New post 13 May 2012, 03:36
I narrowed it down between D and E due to the idiomatic use of such x as Y and proper parallel structures

then I chose E because I know the GMAT prefers active over passive voice.
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As an addendum to my earlier posting, let may say that all the five choices in the context are active voice sentences; so the use of active versus passive voice is not tested here. In addition, Choice C, D and E use the template: such as x and y and not such x as y
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New post 13 May 2012, 05:14
so then what is the grammatical distinction, if any, between the structures:

vaccinating of humans
vaccinating humans?

I'm guessing vaccinating humans would be preferred if all else equal?
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New post 13 May 2012, 05:17
also is it just me, or does the SC section seem to have a LOT of parallel error type questions?? Even questions with other errors seem to contain parallel errors along with some other error eg. parallel errors + verb tense
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Merely saying vaccinating may mislead. Used as an adjectival phrase, vaccinating humans may refer to those humans who do the job of vaccination. Vaccinating is a present participle and not a gerund in that instance. However, vaccinating of humans is out and out a gerund. That is why for use as a gerund, we may add the preposition of to be sure

Parallelism error is one of the most used aspects of sentence structure at least in GMAT. Although purely singular errors such as lack of parallelism alone may appear rarely in GMAT, the normal practice often is to cobble two or three errors together, of which parallelism will be one either as the primary error or as a secondary error.
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New post 13 May 2012, 06:06
So to take this further, simple and complex gerunds cannot be parallel and if we change vaccinating humans to:
I am vaccinating humans now then it turns into a simple gerund if vaccinating humans modifies a noun. Gotchya.
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I am vaccinating is not used in the sense of gerund which i a noun. Because of the addition of am to the present participle vaccinating, I am vaccinating turns into a present progressive, which is a verb.

If you have any further doubts, you may perhaps like to read some good guide on the verbals namely present and past participles, gerunds and infinitives – may be MGMAT’S SC guide.
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New post 13 May 2012, 10:27
thanks daagh; looks like I'm going to have to do some reading of the SC guide. I just skimmed over those topics but some more in depth reading is in order...
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New post 13 May 2012, 14:01
A ad B are wrong because using like means similar to which in this case they are not trying to show similar examples rather they are saying which diseases.

C and D are out because the either x or y is not parallel.
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Concept tested: Idioms, Special construction
Difficulty: 650
Illustration: Proper idiomatic construction rules say that
1. Such as is preferred to like
2. Either X or Y is the correct idiomatic structure provided X and Y are parallel.
Using 1, we can A and B are eliminated
Using 2, we can eliminate C and D
E is the correct answer

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souvik101990 wrote:
Most efforts to combat such mosquito-borne diseases like malaria and dengue have focused either on the vaccination of humans or on exterminating mosquitoes with pesticides.

A like malaria and dengue have focused either on the vaccination of humans or on exterminating
B like malaria and dengue have focused either on vaccinating of humans or on the extermination of
C as malaria and dengue have focused on either vaccinating humans or on exterminating
D as malaria and dengue have focused on either vaccinating of humans or on extermination of
E as malaria and dengue have focused on either vaccinating humans or exterminating


In GMAT English "such as" is to be used always to present a list, not "like".
Hence (A) and (B) incorrect.

Secondly -Correct usage of Either "X" or "Y" - X and Y should be in same form

C and D put incorrect "on" before exterminating.

Hence
[Reveal] Spoiler:
E

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E is the right answer.
Such as should be used instead of like.
Either X or Y.
X and Y should be parallel.
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New post 06 Oct 2012, 11:42
C and E can be shortlisted as they both use vaccinating with exterminating , However C adds ON EXTER. where On is not needed , therefore E is the correct choice..
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New post 10 Oct 2012, 00:35
Concept tested: Idioms, Special construction
Difficulty: 650
Illustration: Proper idiomatic construction rules say that
1. Such as is preferred to like
2. Either X or Y is the correct idiomatic structure provided X and Y are parallel.
Using 1, we can A and B are eliminated
Using 2, we can eliminate C and D
E is the correct answer

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Re: Most efforts to combat such mosquito-borne diseases like [#permalink]

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New post 10 Oct 2012, 23:27
OHH.. best choices are B AND E.. as both are parelel..

i select B.. because like and as confused me alot ..

E is corect ..agree!!
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New post 11 Oct 2012, 01:10
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+1E

On either…or is correct
Either on…or on…..is also correct (I suppose)
On either…or on is not correct, eliminate C and D

Like presents comparison
As presents examples, eliminate A and B

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Most efforts to combat such mosquito-borne diseases like malaria and dengue have focused either on the vaccination of humans or on exterminating mosquitoes with pesticides.

A like malaria and dengue have focused either on the vaccination of humans or on exterminating
B like malaria and dengue have focused either on vaccinating of humans or on the extermination of
C as malaria and dengue have focused on either vaccinating humans or on exterminating
D as malaria and dengue have focused on either vaccinating of humans or on extermination of
E as malaria and dengue have focused on either vaccinating humans or exterminating
Re: Most efforts to combat such mosquito-borne diseases like   [#permalink] 11 Oct 2012, 08:59

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