单项选择题

In the author's opinion, the importance of coal-generated electricity could increase in the future for which of the following reasons

A．The possible substitutes are too dangerous.
B．The cost of changing to other fuels is too great.
C．The future availability of other fuels is uncertain.
D．Other fuels present too many environmental problems.

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单项选择题

What makes coal-fired power plants less attractive today

A．Acid rain.
B．Problems of waste disposal and pollution control.
C．Future growth of nuclear power.
D．Sufficient supply of oil and natural gas.

单项选择题

According to the passage, which of the following statements concerning Edison's electric light bulb is true

A．It replaced gas as a light source.
B．It increased the need for electric power.
C．It was safer than any other methods of lighting.
D．It could work only with electricity generated from coal.