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Geologists believe that the warning signs for a major

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Geologists believe that the warning signs for a major [#permalink] New post 08 May 2005, 02:57
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A
B
C
D
E

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Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changing the measured strain across a fault zone, and varying the electrical properties of underground rocks.
A. changing the measured strain across a fault zone, and varying
B. changing measurements of the strain across a fault zone, and varying
C. changing the strain as measured across a fault zone, and variations of
D. changes in the measured strain across a fault zone, and variations in
E. changes in measurements of the strain across a fault zone, and variations among
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 [#permalink] New post 08 May 2005, 03:14
I'll pick D for parallelism. Will try explaining after knowing the OA. :wink:
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 [#permalink] New post 08 May 2005, 03:52
rthothad wrote:
saurabhmalpani wrote:
pick D

any explanation?


Parallel structure.

Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changes in the measured strain across a fault zone, and variations in
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 [#permalink] New post 08 May 2005, 04:07
OA is D
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 [#permalink] New post 09 May 2005, 12:31
why do we need the comma before "and" ? maybe someone can help... :)
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 [#permalink] New post 09 May 2005, 15:45
christoph wrote:
why do we need the comma before "and" ? maybe someone can help... :)

In GMAT a 'comma' before 'and' is OK - may be it is of a different writing style - I have not seen this style during my school days either.
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 [#permalink] New post 09 May 2005, 18:05
christoph wrote:
why do we need the comma before "and" ? maybe someone can help... :)


... With correct choice (D):
Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changes in the measured strain across a fault zone, and variations in the electrical properties of underground rocks.

Good question about commas: in this case it's called a serial comma, and question is whether to use it.

Suppose you have a list that itemizes things like this:
Items on the menu included w, x, y, and z
or do you say,
Items on the menu included w, x, y and z
(without the final "serial" comma)?

The test question above is constructed the same way, it just has phrases in place of w, x, y, and z.

ETS wouldn't test this specifically, because both styles are "correct". It's kind of optional.

Traditional, standard written English recommends that you DO use that final serial comma, to avoid ambiguity. Not a life-or-death issue, but that is the syntactically consistent way to write the sentence. "And" is a conjuntion. The comma is a punctuation mark. They are NOT interchangeable. Just using the word "and" does not in fact eliminate the need for a comma.

But more important, sometimes it may not be clear, if you don't use the comma, whether the "y and z" elements are together or separate ... e.g., is it Fish and Chips, or separate items (1) fish and (2) chips? Using that final comma removes all uncertainty. In a more complex, longer sentence with a lot of and's in it, things could really get confusing if the punctuation is not tight.

But ... journalists (in the US anyway) have adopted the style of NOT using that final comma in order to conserve one character in their articles, and so people are accustomed to not seeing it. You'd see this, for example, in the "AP Style Guide". In fact, if you asked a reporter or newspaper editor, they would insist that it's "wrong" to use the final comma, because they were trained not to.

They have no idea they have been trained to violate standard usage in that way. In fact I have heard a lot of people insist that it's "against the rules" to use the final comma -- but they are incorrect, and I'm not sure why they think they were ever taught that.

Bottom line is, I use the comma and it always annoys me when it's missing. But it is considered optional.
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 [#permalink] New post 09 May 2005, 18:20
A. changing the measured strain across a fault zone, and varying
- 'changing' and 'varying' maintains a 'false parallelism' as it is changes and variatiosn that are signs, not the current process of change and variation.

B. changing measurements of the strain across a fault zone, and varying
- 'changing' and 'varying' maintains a 'false parallelism' as it is changes and variatiosn that are signs, not the current process of change and variation.

C. changing the strain as measured across a fault zone, and variations of
- Still have a 'changing'

D. changes in the measured strain across a fault zone, and variations in

E. changes in measurements of the strain across a fault zone, and variations among

Between D and E, D is parallel (changes in... variations in)

D for me.
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 [#permalink] New post 09 May 2005, 23:06
thx, supercat and rthothad :)
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 [#permalink] New post 10 May 2005, 02:24
christoph wrote:
thx, supercat and rthothad :)


Sure no need to have comma in this case :P
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  [#permalink] 10 May 2005, 02:24
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