GMAT数学的重点题型之一平行并列：
平行并列：见到平行看结构，形式功能要对称.就GMAT而言，平行并列是考试中的.重点也是难点，英语称其为parallel structure: this is a little bit like making sure that the two sides of a mathematical equation are balance.就解题而言要求做到四个点。
形式对称
概念对等
功能相同
含义单一
一)形式对称：
指平行并列连接词前后的词形式上完全对称
下面以GMAT考试pre test 1为例：
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
