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

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Manager
Joined: 12 Apr 2009
Posts: 205
The peaks of a mountain range, acting like rocks in a [#permalink]

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27 May 2009, 21:18
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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 he air that forms them is moving rapidly, are

E. stationary crests and troughs although they are formed by rapidly moving air, is

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Joined: 12 May 2009
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27 May 2009, 21:34
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 --> Incorrect

B. crests and troughs that remain stationary although they are formed by rapidly moving air, are --> Incorrect

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 --> Incorrect

E. stationary crests and troughs although they are formed by rapidly moving air, is --> Correct

Looking out for "the resulting pattern", which is singular, so the sentence should follow with "is". POE eliminates A, B, D. Between C and E, E looks more clear and straight.
I will go with E.

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: Peaks -   [#permalink] 27 May 2009, 21:34
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