2. 外语
  3. The flow of an electric current in a regular conductor is made possible by the fact that______. The breakthrough made in superc

The flow of an electric current in a regular conductor is made possible by the fact that______. The breakthrough made in superc

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问题 The flow of an electric current in a regular conductor is made possible by the fact that______.
The breakthrough made in superconductivity in 1992 is remarkable because ______.
选项 A、metal-containing ceramics turned out to be superconductors
B、higher-temperature superconductivity was made possible
C、ceramics were found to be superconductors
D、room-temperature superconductors were developed
答案B
解析 相关内容位于文章第四段第二句，原文为“到1992年，科学家已经研制出在-297°F时处于超导状态的陶瓷，研究人员推测在室温时出现超导现象也是可能的”。结合四个选项，只有选项B与原文相符。
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