OG10-62/OG11-82

Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changing the measured strain across a fault zone and varying the electrical 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 variations of

(D)  changes in the measured strain across a fault zone，and variations in

(E)  changes in measurements of the strain across a fault zone，and variations among

Parallelism

This sentence uses four phrases to describe the warning signs for all earthquake．These phrases should be parallel．The first sign is sudden fluctuations in local seismic activity, the second is tilting and other deformations of the Earth's crust．Tilting this case is used as a noun，just as deformations and fluctuations are nouns．The first two signs are parallel．The third and fourth warning signs resemble tilling in the—ing form，but they are not parallel because they are used as verbs rather than as nouns：changing．．．the strain；varying．．．the properties．To make the latter two signs parallel，nouns must replace verbs：changes in．．variations in．

A  Changing and varying are used as verbs and so are not parallel to the nouns fluctuations and tilting．

B  The four signs are not parallel；the substitution of measurements of the strain distorts meaning．

C  Changing is used as a verb and so does not parallel the nouns fluctuations, tilting, and variations．

D  Correct．In this sentence．the four nouns- fluctuations, tilting, changes, variations-are parallel，and the meaning of the measured strain is not distorted．

E  This sentence says that the measurements indicate an earthquake when the measured strain is the warning sign．

The correct answer is D．

OG11对E选项的解释是啥意思？

但是真正是warning signs 的应该是changes吧，无论是in the measured strain 还是in measurements of the strain都是修饰changes的吧。

平行并列的部分，形式： 名词1 ， 名词2,  名词3, and 名词4

这里的名词1： fluctuations,

    名词2： tilting and other deformations of the Earth's crust,

    名词3：changes

  名词4： variations

 fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changing the measured strain across a fault zone and varying the electrical properties of underground rocks