ziyuen wrote:
Tiny quantities of more than thirty rare gases, most of them industrial by-products, threaten
to warm the Earth's atmosphere even more rapidly than carbon dioxide during the next fifty years.
(A) to warm the Earth's atmosphere even more rapidly than carbon dioxide during the next fifty years
(B) to warm the Earth's atmosphere even
MORE rapidly over the next fifty years
THAN carbon dioxide
will(C) during the next fifty years to warm the Earth's atmosphere even more rapidly than carbon dioxide
(D) a warming of the Earth's atmosphere during the next fifty years even more rapid than carbon dioxide's
(E) a warming of the Earth's atmosphere even more rapid than carbon dioxide's will be over the next fifty years
GMATNinjaTwo Does (B) correctly compare
MORE rapidly....
THAN carbon dioxide
WILL? I have no idea why do we need
WILL at the end of the sentence.
Hi
ziyuen,
Quantities threaten to warm atmosphere more rapidly than carbon dioxide.Here you can deduce two meanings:I. Quantities threaten to warm atmosphere more rapidly than Quantities threaten to warm carbon dioxide.
II. Quantities threaten to warm atmosphere more rapidly than carbon dioxide threaten to warm atmosphere
If you go by meaning then II is correct.
Now we know if can skip the words in parallelism if the meaning is not compromised. This is called ellipsis.
As you see "threaten to warm the atmosphere" is an action which is repeated twice in the sentence II. We can use verb WILL and elipse "threaten to warm the atmosphere", which can be understood.
Quantities threaten to warm atmosphere more rapidly than carbon dioxide WILL {threaten to warm atmosphere}Ellipsis Trick: whenever you see parallelism in which some words or phrase is ellipsed then try to write out (in mind only
) the full sentence without skipping any word. This has more to do with the meaning and is widely tested in exam.
Hope this clears the doubt