The flow of an electric current in a regular conductor is made possible by the fact that______. The word "bump" in Paragraph 3

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问题 The flow of an electric current in a regular conductor is made possible by the fact that______.
The word "bump" in Paragraph 3 may mean _______.

选项 A、to make something run fast
B、to cause to revolve
C、to move smoothly
D、to collide

答案D

解析见文章第三段中的最后两句，其中描述了处于超导状态时，电子对可以和谐地、无碰撞地通过金属导体，由此可推导出电子必然会经常碰撞。故应选D。

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