CO

This topic has expert replies
User avatar
Master | Next Rank: 500 Posts
Posts: 377
Joined: Wed Sep 14, 2011 10:45 am
Thanked: 10 times
Followed by:1 members

CO

by imskpwr » Wed Sep 05, 2012 10:43 am
Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere increased by enough of a percentage during the twentieth century that they began to trap heat radiating from the Earth, causing the average surface temperature to rise.

Levels of atmospheric carbon monoxide increased sufficiently during the twentieth century to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

Atmospheric carbon monoxide levels increased by a sufficient percentage during the twentieth century to begin trapping heat radiating from the Earth, which caused the average surface temperature to rise.

Levels of carbon monoxide in the atmosphere during the twentieth century increased enough to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

Master | Next Rank: 500 Posts
Posts: 141
Joined: Sun Apr 01, 2012 10:53 am
Thanked: 5 times
Followed by:4 members

by ankit0411 » Wed Sep 05, 2012 7:17 pm
imskpwr wrote:Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere increased by enough of a percentage during the twentieth century that they began to trap heat radiating from the Earth, causing the average surface temperature to rise.

Levels of atmospheric carbon monoxide increased sufficiently during the twentieth century to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

Atmospheric carbon monoxide levels increased by a sufficient percentage during the twentieth century to begin trapping heat radiating from the Earth, which caused the average surface temperature to rise.

Levels of carbon monoxide in the atmosphere during the twentieth century increased enough to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

I will go with option C
Don't predict future , create it !

User avatar
Master | Next Rank: 500 Posts
Posts: 377
Joined: Wed Sep 14, 2011 10:45 am
Thanked: 10 times
Followed by:1 members

by imskpwr » Thu Sep 06, 2012 7:47 am
ankit0411 wrote:
imskpwr wrote:Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere increased by enough of a percentage during the twentieth century that they began to trap heat radiating from the Earth, causing the average surface temperature to rise.

Levels of atmospheric carbon monoxide increased sufficiently during the twentieth century to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

Atmospheric carbon monoxide levels increased by a sufficient percentage during the twentieth century to begin trapping heat radiating from the Earth, which caused the average surface temperature to rise.

Levels of carbon monoxide in the atmosphere during the twentieth century increased enough to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

I will go with option C
waiting for an expert to reply.

Senior | Next Rank: 100 Posts
Posts: 57
Joined: Thu Aug 23, 2012 7:50 pm
Thanked: 4 times

by 7777 » Thu Sep 06, 2012 9:15 pm
imskpwr wrote:Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere increased by enough of a percentage during the twentieth century that they began to trap heat radiating from the Earth, causing the average surface temperature to rise.

Levels of atmospheric carbon monoxide increased sufficiently during the twentieth century to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

Atmospheric carbon monoxide levels increased by a sufficient percentage during the twentieth century to begin trapping heat radiating from the Earth, which caused the average surface temperature to rise.

Levels of carbon monoxide in the atmosphere during the twentieth century increased enough to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.



Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.("it" isn't right here."it" doesn't have any antecedent and doesn't fit in this context)

Carbon monoxide levels in the atmosphere increased by enough of a percentage during the twentieth century that they began to trap heat radiating from the Earth, causing the average surface temperature to rise.(they refer to CO levels,but the levels didn't trap heat,CO did.)eliminate this choice.

Levels of atmospheric carbon monoxide increased sufficiently during the twentieth century to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

Atmospheric carbon monoxide levels increased by a sufficient percentage during the twentieth century to begin trapping heat radiating from the Earth, which caused the average surface temperature to rise.(which refers to earth) eliminate it

Levels of carbon monoxide in the atmosphere during the twentieth century increased enough to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.(this sentence states that levels of CO in 20th century increased lateron, may be in 21st century,and caused the trapping of heat.)it shifts the meaning and thus is incorrect.

User avatar
Master | Next Rank: 500 Posts
Posts: 184
Joined: Sun Aug 19, 2012 10:04 pm
Thanked: 10 times
Followed by:2 members

by Mission2012 » Fri Sep 07, 2012 2:48 am
(A)Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

"It" has no antecedent. "it" can't refer back to "carbon monoxide" (co), as CO is acting as an adjective here.

(B)Carbon monoxide levels in the atmosphere increased by enough of a percentage during the twentieth century that they began to trap heat radiating from the Earth, causing the average surface temperature to rise.

"they" has no antecedent. "they" can't refer back to "carbon monoxide" (co), as CO is acting as an adjective here.

(C)Levels of atmospheric carbon monoxide increased sufficiently during the twentieth century to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.


(D)Atmospheric carbon monoxide levels increased by a sufficient percentage during the twentieth century to begin trapping heat radiating from the Earth, which caused the average surface temperature to rise.

Modified beginning with "which" refers to "Earth". Hence incorrect

(E)Levels of carbon monoxide in the atmosphere during the twentieth century increased enough to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

I think (C) and (E) are both grammatically correct.

Examining from the meaning's perspective. (C) is better than (E).

Reason - (E) means that "Level of CO" of "20th Century" increased - Not sure when it increased
(C) means that "Level of CO increased" in "20th Century"
(C) appears much better than (E).
If you find my post useful -> please click on "Thanks"

User avatar
Master | Next Rank: 500 Posts
Posts: 377
Joined: Wed Sep 14, 2011 10:45 am
Thanked: 10 times
Followed by:1 members

by imskpwr » Fri Sep 07, 2012 7:02 am
Mission2012 wrote:(A)Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

"It" has no antecedent. "it" can't refer back to "carbon monoxide" (co), as CO is acting as an adjective here.

(B)Carbon monoxide levels in the atmosphere increased by enough of a percentage during the twentieth century that they began to trap heat radiating from the Earth, causing the average surface temperature to rise.

"they" has no antecedent. "they" can't refer back to "carbon monoxide" (co), as CO is acting as an adjective here.

(C)Levels of atmospheric carbon monoxide increased sufficiently during the twentieth century to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.


(D)Atmospheric carbon monoxide levels increased by a sufficient percentage during the twentieth century to begin trapping heat radiating from the Earth, which caused the average surface temperature to rise.

Modified beginning with "which" refers to "Earth". Hence incorrect

(E)Levels of carbon monoxide in the atmosphere during the twentieth century increased enough to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

I think (C) and (E) are both grammatically correct.

Examining from the meaning's perspective. (C) is better than (E).

Reason - (E) means that "Level of CO" of "20th Century" increased - Not sure when it increased
(C) means that "Level of CO increased" in "20th Century"
(C) appears much better than (E).
The contest was between C and E.
The reasons given are not full-proof to eliminate a choice.
Still need an expert's opinion on the subject matter at hand.

User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pm
Location: New York, NY
Thanked: 13060 times
Followed by:1906 members
GMAT Score:790

by GMATGuruNY » Fri Sep 07, 2012 7:16 am
imskpwr wrote:Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere increased by enough of a percentage during the twentieth century that they began to trap heat radiating from the Earth, causing the average surface temperature to rise.

Levels of atmospheric carbon monoxide increased sufficiently during the twentieth century to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

Atmospheric carbon monoxide levels increased by a sufficient percentage during the twentieth century to begin trapping heat radiating from the Earth, which caused the average surface temperature to rise.

Levels of carbon monoxide in the atmosphere during the twentieth century increased enough to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.
In E, it is not crystal clear what is being modified by during the twentieth century. Check my post here:

https://www.beatthegmat.com/mgmat-sc-t82409.html
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3

User avatar
Master | Next Rank: 500 Posts
Posts: 377
Joined: Wed Sep 14, 2011 10:45 am
Thanked: 10 times
Followed by:1 members

by imskpwr » Fri Sep 07, 2012 7:51 am
GMATGuruNY wrote:
imskpwr wrote:Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere grew by enough of an increased percentage during the twentieth century that it began to trap heat radiating from the Earth, and it caused the average surface temperature to rise.

Carbon monoxide levels in the atmosphere increased by enough of a percentage during the twentieth century that they began to trap heat radiating from the Earth, causing the average surface temperature to rise.

Levels of atmospheric carbon monoxide increased sufficiently during the twentieth century to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.

Atmospheric carbon monoxide levels increased by a sufficient percentage during the twentieth century to begin trapping heat radiating from the Earth, which caused the average surface temperature to rise.

Levels of carbon monoxide in the atmosphere during the twentieth century increased enough to begin trapping heat radiating from the Earth, causing the average surface temperature to rise.
In E, it is not crystal clear what is being modified by during the twentieth century. Check my post here:

https://www.beatthegmat.com/mgmat-sc-t82409.html
Thanks!
Not more. Not less. Just what is required. Excellent explanation once again.

User avatar
Master | Next Rank: 500 Posts
Posts: 184
Joined: Sun Aug 19, 2012 10:04 pm
Thanked: 10 times
Followed by:2 members

by Mission2012 » Sat Sep 08, 2012 9:59 am
Hi GMATGuruNY,

In option A and B, is Carbon Monoxide acting as an adjective?
If it is acting as adjective then can "it" and "they" refer back to them?

Thanks
If you find my post useful -> please click on "Thanks"