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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参考答案

细节题。题干：与传统的普通电导体相比，超导体__________。第二段的第二句和第四句提供了明确的答案：超导体几乎没有电阻，而普通导体都有一定的电阻。故选A。

1 At what temperature does the superconducting ceramic lose its resistance?

A．-143 degree Celsius.

B．-263 degree Celsius.

C．As long as it is ice-cold.

D．Absolute zero.

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2 What element enables the ceramic tape to lower its temperature?

A．Copper.

B．Liquid nitrogen.

C．Clay.

D．Calcium.

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3 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 Fribie experiment is not successful.

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