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Some medical researchers assert that rays of intense

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Some medical researchers assert that rays of intense [#permalink]

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04 Aug 2010, 20:06
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88% (00:37) correct 13% (00:00) wrong based on 8 sessions

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Some medical researchers assert that rays of intense radiation originating from solar flares and estimated at three to four times greater than the frequency of visible light damage human skin cells and prolonged exposure can lead to serious burns.

A. at three to four times greater than the frequency of visible light damage
B. as being three to four times greater than the frequency of visible light damages
C. that it is three to four times greater than the frequency of visible light damages
D. to be three to four times greater than the frequency of visible light damage
E. as three to four times greater than the frequency of visible light damage

[Reveal] Spoiler: OA

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Re: Some medical researchers assert [#permalink]

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04 Aug 2010, 20:27
I would go with D, as Estimiated to be is the correct idiom to be used, Estimated at can be used if it is said to be estimated at a place....which is not the case here!
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Re: Some medical researchers assert [#permalink]

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05 Aug 2010, 08:09
I got confused with the idiom "estimated at" or "estimated to be" and picked A.

agree with D though.

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Re: Some medical researchers assert [#permalink]

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05 Aug 2010, 10:37
IMO D..
estimated to be is the right idiom..
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Re: Some medical researchers assert [#permalink]

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05 Aug 2010, 16:06
D because of the idiom.
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Re: Some medical researchers assert   [#permalink] 05 Aug 2010, 16:06
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