单项选择题

In 1996, Arthur C. Clarke predicted that

A．biological power sources would be put into use soon.
B．oil, gas and coal could be repeatedly used in the future.
C．dependence on non-renewable power sources would be reduced soon.
D．the Chernobyl disaster would happen in two years.

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单项选择题

According to the last paragraph, which of the following statements is NOT true

A．Other cities hope they can also conserve power.
B．Other cities hope they can use superconducting cables soon.
C．Superconductors waste less power because of their low resistance.
D．The Frisbie experiment is not successful.

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.