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# The most vexing problem faced by researchers exploring

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Senior Manager
Joined: 11 Sep 2005
Posts: 332
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The most vexing problem faced by researchers exploring [#permalink]  29 Sep 2007, 22:10
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The most vexing problem faced by researchers exploring wind-powered generation of electricity is achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload electrical grids with sudden voltage increases

A. achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload
B. achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading.
C. how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload.
D. how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading
E. how a constant flow of power from an unpredictable natural source can be achieved, which meets demand but does not overload.

Debated over D & E, finally picked D.....reason: flow meets demand seems more appropriate than source meeting demand in choice E

Director
Joined: 23 Sep 2007
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Kudos [?]: 70 [0], given: 0

[#permalink]  29 Sep 2007, 22:26
IMO C

(A) is awkward

(D) "but a flow that meets demand" changes the meaning of the sentence and seems to suggest that the "constant flow" does not meet demand.

(E) The most vexing problem ... is how to achieve VS The most vexing problem ... is how a constant flow

What is the OA?
SVP
Joined: 28 Dec 2005
Posts: 1597
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Kudos [?]: 67 [0], given: 2

[#permalink]  30 Sep 2007, 04:13
I say C as well. I dont like the word "but" in choice D
[#permalink] 30 Sep 2007, 04:13
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# The most vexing problem faced by researchers exploring

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