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Senior Manager
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The most vexing problem faced by researchers exploring [#permalink]
 29 Sep 2007, 23:10
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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
Views please????
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Director
Joined: 23 Sep 2007
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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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SVP
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I say C as well. I dont like the word "but" in choice D
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