2. 外语
  3. The flow of an electric current in a regular conductor is made possible by the fact that______. At very low temperatures, super

The flow of an electric current in a regular conductor is made possible by the fact that______. At very low temperatures, super

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问题 The flow of an electric current in a regular conductor is made possible by the fact that______.
At very low temperatures, superconductivity in a metal occurs where______.
选项 A、electrons do not move freely through the metal
B、electrons are crowded together
C、paired electrons move uninterruptedly
D、paired electron dance together to and fro
答案C
解析 题干涉及的内容位于第三段中的二、三、四句，原文为“低温时，电子结合成对，并且可以没有任何阻力”地作和谐运动。与选项C含义相同。
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