单项选择题

Compared to common electrical conductors, superconductors

A．have little or no electrical resistance.
B．can be used for a long time.
C．are not energy-efficient.
D．can be made easily.
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单项选择题
What is the benefit of the revolution mentioned in the first paragraph
A．With a flip of switch, electricity can be transmitted.
B．Other American cities can benefit from the high-performance cables.
C．Great amounts of power can be conserved.
D．Detroit will first receive electricity transmitted by the new electrical cables.
单项选择题
What element enables the ceramic tape to lower its temperature
A．Copper.
B．Liquid nitrogen.
C．Clay.
D．Calcium.
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