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Unlike previous hypotheses concerning climate changes,

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Unlike previous hypotheses concerning climate changes, [#permalink]

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13 Feb 2007, 15:52
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Unlike previous hypotheses concerning climate changes, paleontological circles have introduced a new theory for the extinction of the dinosaurs in the form of a lethal comet.

(A) paleontological circles have introduced a new theory for the extinction of the dinosaurs in the form of a lethal comet
(B) paleontologists are examining a new theory for the extinction of the dinosaurs, one involving a lethal comet
(C) a new theory for the extinction of the dinosaurs has made its way into paleontological circles, this time citing a lethal comet as the cause of the extinction
(D) a new theory citing a lethal comet as the cause of the extinction of the dinosaurs has made its way into paleontological circles
(E) the introduction of a new theory, citing a lethal comet as the cause of dinosaur extinction, has made its way into paleontological circles
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13 Feb 2007, 17:47
A,B, E out since they make improper comparisons

C uses "a new theory for the extinction of the dinosaurs " - for makes the scentence unclear

so D
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13 Feb 2007, 18:56
D
Unlike previous hypothesis should modify "a new thoeory".

D is more concise than C.
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13 Feb 2007, 19:54
hepotheses should be parallel to a theory, not to the paleonthological circles.
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brainstorm

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13 Feb 2007, 23:31
D .......previous hypotheses...a new theory.

Out of C and D .....D is better
13 Feb 2007, 23:31
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