一道阅读题求解－99年四月Sec B

米兰的拿铁

文章：
Benjamin Franklin established that lightning is the transfer of positive or negative electrical charge between regions of a cloud or from cloud to earth. Such transfers require that electrically neutral clouds, with uniform charge distributions, become electrified by separation of charges into distinct regions. The greater this separation is, the greater the voltage, or electrical potential of the cloud. Scientists still do not now the precise distribution of charges in thunderclouds nor how separation adequate to support the huge voltages typical of lightning bolts arises. According to one theory, the precipitation hypothesis, charge separation occurs as a result of precipitation. Larger droplets in a thundercloud precipitate downward past smaller suspended droplets. Collisions among droplets transfer negative charge to precipitating droplets, leaving the suspended droplets with a positive charge, thus producing a positive dipole in which the lower region of the thundercloud is filled with negatively charged raindrops and the upper with positively charged suspended droplets.

题：The passage suggests that lightning bolts typically
(A) produce a distribution of charges called a positive dipole in the clouds where they originate
(B) result in the movement of negative charges to the centers of the clouds where they originate
(C) result in the suspension of large, positively charged raindrops at the tops of the clouds where they originate
(D) originate in clouds that have large numbers of negatively charged droplets in their upper regions
(E) originate in clouds in which the positive and negative charges are not uniformly distributed

我选的是A，但我的资料答案是E，网上有人说是A，求解。。。

米兰的拿铁

晕。。。没有一个解答的。。。这是什么情况

竹林中人

E，肯定不对，文章并没有提到电荷是否均匀分布。A make sense

米兰的拿铁

竹林中人 发表于 2013-9-29 11:18
E，肯定不对，文章并没有提到电荷是否均匀分布。A make sense

文中其实提到不是均匀分布了的－－“in which the lower region of the thundercloud is filled with negatively charged raindrops and the upper with positively charged suspended droplets.”
云层不一样其实算是正负电极不均匀分布的意思。
所以。。。还是困惑到底选什么阿。。

竹林中人

米兰的拿铁 发表于 2013-9-30 23:29
文中其实提到不是均匀分布了的－－“in which the lower region of the thundercloud is filled with neg ...

这里是originate in clouds ，也就是说产生电荷分离之前的云，而不是之后的。