专家指导：GMAT语法最新机考题型详尽分析

       (C) exhibit a preference in either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include

       (D) exhibit a preference for using either the right or the left hand (i.e., claw, paw, or foot) has been expanded to include

       (E) exhibit the preference as to either using the right or the left hand (i.e., claw, paw, or foot) has been expanded and includes

       译文：动物展示出用左手或右手等的列表已经进一步的扩大到了更为低等的脊椎动物

       分析：定语从句的主谓一致取决于所修饰对象.前面出现的是animals 所以应该是复数.答案只能在CDE中产生.either or 要求形式是要对称. 而C和E选项中出现了either using or the left表达错。

       由此可见GMAT在考查平行并列过程中要求前后严格对称。

       二)概念对等：

       平行并列过程中,要求概念要对等,就名词而言,特指对特指,抽象对抽象,具体对具体.它们从来不相互对应进行并列。

       New theories propose that catastrophic impacts of asteroids and comets may have caused reversals in the Earth’s magnetic field, the onset of ice ages, splitting apart continents 80 million years ago, and great volcanic eruptions.

       A splitting apart continents

       B the splitting apart of continents

       C split apart continents

       D continents split apart’

       E continents that were split apart

       译文：新的理论提出小行星和慧星灾难性的影响可能引地磁场的颠倒，冰川时代的到来，8千万年前大陆的分裂以及火山的喷发。

       分析：本题平行并列部分是. Reversals , the onset, …. And eruption显然是由动词的抽象名词词形的并列。所以动词的抽象名词表结果，只能和抽象名词并列，而doing强调动做,就splitting apart而言，无名词，所以只能用the splitting apart表达此意。

       本题选的是B

       三)功能相同

       有些特殊题目无法做到形式对称也只能退一步保证功能相同如：

       scientists have recently discovered what could be the largest and oldest living organism on Earth. A giant fungus that is an interwoven filigree of mushrooms and root like tentacles spawned by a single fertilized spore some 10000 years ago and extending for more than 30 acres in the soil of a Michigan forest.