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The peaks of a mountain range, acting like rocks in a

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Manager
Joined: 18 Sep 2004
Posts: 156
Location: Dallas, TX
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The peaks of a mountain range, acting like rocks in a [#permalink]  05 Nov 2004, 15:09
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The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves."

(A) crests and troughs that remain stationary although the air that forms them is moving rapidly, are

(B) crests and troughs that remain stationary although they are formed by rapidly moving air, are

(C) crests and troughs that remain stationary although the air that forms them is moving rapidly, is

(D) stationary crests and troughs although the air that forms them is moving rapidly, are

(E) stationary crests and troughs although they are formed by rapidly moving air, is
Manager
Joined: 21 Jul 2004
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I would go w/ C. Eliminated A, B and D because flower pattern is singular, so we need to use is, not are. Please correct me if i am wrong
Senior Manager
Joined: 21 Jun 2004
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My vote is for C.
This is a great question. A toughie from OG.

Paul,Venks..Let me know if my approach is correct.
There is a semicolon. So just start reading the sentence from the semicolon to spot the error.
Now, my question becomes .

the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves."

I do not know what it is called but there is some grammar rule that tells us that we can remove the stuff within the commas to see if the sentence makes sense.

So, we are left with.
the resulting flow pattern are known as "standing waves."

Pattern is singular..so we need to use is.

First breakthrough here. Eliminate A,B,D.
Read the remaining two options- C and E.
E does not sound good to me because of â€˜Theyâ€™ .

So, I narrow it down to C.
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510 on my first GMAT. 610 on second GMAT.!
The struggle continues.

Manager
Joined: 18 Sep 2004
Posts: 156
Location: Dallas, TX
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Great job guys, good explanations. The OA is C.
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