According to the passage, the science of the future is likely to be

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.

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.