Geologists believe that the warning signs for a major earthquake may include sudden fluctuation in local Seismic activity, titling and other deformation of the Earth's crusts, changing the mearsured strain across a fault zone, and varying the elctrical properties of underground rocks.

A. changing the measured strain across a fault zone, and varying

B. changing measurements of the strain across a fault zone, and varying

C. changing the strain as measured across a fault zone, and variation in

D changes in the measured strain across a fault zone, and variation in

E. changes in the mearsurement of the strain across a fault zone, and variations among

这题到底是什么和什么平行啊， 晕的很！到底平行的是名字还是动词啊！？

OA 给的是D, 我怎么老看着B像呢？

吓我一跳，还以为哪又地震了呢，，，

是有点晕阿 赫赫..

这个题目的平行实际上就是几个名词的平行

只不过考点是在考动作性名词和-ing分词作动名词的差别

通常情况下动作性名词就应该和动作性名词并列，如果这个动词没有动作性名词，那么才用-ing分词代替它的动作性名词

这个题目里面 fluctuation，titling and other deformation 这两个词组都是动作性名词，所以选项里面也应该是动作性名词而不是动名词 从而应该选择changes和variation而不是changing 和varying

E里面，changes in the measurement of ... 的表达是不好的，意思是在测量上的变化，并且更倾向于测量方法上的变化，这个表达不如D 在所测得的结果上的变化

同时variation in也比variations among要好很多

希望这么解释可以帮到你：）