This passage is about a. Ice particles bouncing off hail falling through a cloud acquire.

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问题 This passage is about a______.
Ice particles bouncing off hail falling through a cloud acquire______.

选项 A、a negative charge
B、no electric charge at all
C、a positive charge
D、both A and C

答案C

解析文章第一段就谈到了这个问题，这实际上是 Scorer博士关于闪电成因的主要观点：从冰雹上反弹下来的冰粒子带正电子。

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大学英语六级

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