jainrahul1985 wrote:Although the turtle has been toothless for more than 150 million years, in some contemporary turtle species the moderately sharp and jagged edges of their horny jaws function for teeth.
(A) their horny jaws function for teeth
(B) its horny jaws function for teeth
(C) its horny jaws function as do teeth
(D) the horny jaws function as teeth do
(E) the horny jaws function as teeth
Can anyone please explain why D is wrong and E is correct
Quickest approach:
The correct idiom is
X functions as Y. Eliminate A and B.
In C and D, the inclusion of
do changes the meaning:
The jaws function as teeth. (This means that the jaws
substitute for teeth. In other words, the jaws and teeth play the same role: both are used to eat. This is the intended meaning of the sentence.)
The jaws function as teeth do. (This means that the jaws and teeth
operate the same way. This is not the intended meaning of the sentence. The jaws and teeth work differently.)
Eliminate C and D. The correct answer is E.
Last edited by GMATGuruNY on Mon Aug 23, 2010 11:29 am, edited 1 time in total.
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