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04 Aug 2010, 20:06
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D
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Difficulty:
35%
(medium)
Question Stats:
100% (00:51) correct
0%
(00:00)
wrong
based on 5
sessions
History
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Not Attempted Yet
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
Please explain your choice of answer.
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
Please explain your choice of answer.
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04 Aug 2010, 20:27
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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!
