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The data collected by weather airplanes that fly into the [#permalink]
04 May 2005, 11:20
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722. The data collected by weather airplanes that fly into the heart of a hurricane are useful mainly for gauging the stormâ€™s structure and strength, not for the speed and the path of their movement.
(A) not for the speed and the path of their movement
(B) not for the speed and path of its movement
(C) not the speed and path of its movement
(D) and not the speed and path of their movements
(E) and not for the speed and the path of its movements
"the storm's structure ...." means the reference to one storm. Therefore, "their movement(s)" can be discarded. Therefore A and D go.
Secondly, since there's a comma, "and" just after the comma is redundant. Thus D and E are inappropriate.
Of remaining B and C, B sounds better because of parallelism (I don't know if even this is called parallelism, since I am trying to find parallels between "mainly for gauging the ..." and "not for the speed...").