单项选择题

Hydrogen （）

A．is a widely-used fuel
B．is not yet in general use as a fuel
C．is not a particularly easy fuel to store
D．is a more economical fuel than wind energy

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单项选择题Alternative sources of energy （）

A．could not possibly reduce the installed capacity of conventional power stations
B．might not reduce the installed capacity of conventional power stations
C．would automatically reduce the installed capacity of conventional power stations
D．would make it necessary to reduce the installed capacity of conventional power stations

单项选择题What, according to this passage, would be the major impact of the newer energy sources（）

A．A reduction of the fuel consumed by conventional power stations.
B．A reduction of the manpower required by conventional power stations.
C．The total replacement of conventional power stations.
D．The total replacement of conventional energy sources.