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# SC-Prep

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SVP
Joined: 04 May 2006
Posts: 1830
Schools: CBS, Kellogg

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07 Feb 2009, 02:31
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Anybody help me understand what kind of this grammar rule? Thanks

23...."them using"...
33. "the Earth gathering information"

both of them are awkard to me!
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23
Scientists believe that unlike the males of most species of moth, the male whistling moths of Nambung, Australia, call female moths to them by the use of acoustical signals, but not olfactory ones, and they attract their mates during the day, rather than at night.

(A) by the use of acoustical signals, but not olfactory ones, and they attract
(B) by the use of acoustical signals instead of using olfactory ones, and attracting
(C) by using acoustical signals, not using olfactory ones, and by attracting
(D) using acoustical signals, rather than olfactory ones, and attract
(E) using acoustical signals, but not olfactory ones, and attracting

33.Like the great navigators who first sailed around the Earth, to gather information about its size and curvature of its surface, new observations have been made by astronomers that show with startling directness the large-scale geometry of the universe.

(A) Like the great navigators who first sailed around the Earth, to gather information about its size and curvature of its surface, new observations have been made by astronomers
(B) Like the great navigators who first sailed around the Earth for gathering information about its size and also the curvature of its surface, new observations have been made by astronomers
(C) Similar to the great navigators who first sailed around the Earth, where they gathered information about its size and the curvature of its surface, astronomers have made new observations
(D) Like the great navigators who first sailed around the Earth gathering information about its size and the curvature of its surface, astronomers have made new observations
(E) Just as with the great navigators who first sailed around the Earth, gathering information about its size and curvature of the surface, astronomers have made new observations
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Joined: 17 Jun 2008
Posts: 1507

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07 Feb 2009, 13:32
In question 23, "using accoustical signals" is an adverbial phrase that modifies "call".

In option 33, "gathering information about ...." is an adverbial phrase that modifies "saled".
Re: SC-Prep   [#permalink] 07 Feb 2009, 13:32
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