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The most vexing problem faced by researchers exploring

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Senior Manager
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Joined: 11 Sep 2005
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The most vexing problem faced by researchers exploring [#permalink] New post 29 Sep 2007, 22:10
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A
B
C
D
E

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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

Views please????
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 [#permalink] New post 29 Sep 2007, 22:26
IMO C

(A) is awkward

(B) meets & overloading don't match

(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?
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 [#permalink] New post 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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