问题:
[不定项选择题]
第二篇Superconducting Ceramic(陶瓷)An underaround revolution beqins this winter. With the flip(轻击)of a switch, 30,000 homes in one part of Detroit will soon become the first in the country to receive elect
A、Copper.
B、Liquid nitrogen.
C、Clay.
D、Calcium.
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