GMAT數學的重點題型之一平行並列：
平行並列：見到平行看結構，形式功能要對稱.就GMAT而言，平行並列是考試中的.重點也是難點，英語稱其為parallel structure: this is a little bit like making sure that the two sides of a mathematical equation are balance.就解題而言要求做到四個點。
形式對稱
概念對等
功能相同
含義單一
一)形式對稱：
指平行並列連線詞前後的詞形式上完全對稱
下面以GMAT考試pre test 1為例：
例1：The airline company, following through on recent warnings that it might start reducing service, announced that it was eliminating jet service to nine cities, closing some unneeded operations, and it grounded twenty-two planes.
closing some unneeded operations, and it grounded
closing some unneeded operations, and grounding
was closing some unneeded operations, while it grounded
it closed some unneeded operations and grounded