单项选择题

What had been the main factor preventing the development of battery buses

A．Their limited range.
B．Their high cost.
C．Their heavy weight.
D．Their loud nois
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单项选择题
The Mark II will have a number of advantages over the prototype. Which of these is NOT one of them
A．It will carry more passengers.
B．It will have a wider range.
C．It can be used all through the way.
D．It will cost less to recharg
单项选择题
Why will battery buses cost less than conventional buses in the long run
A．They will spread the capital cost over a long period.
B．They will be stronger and last longer.
C．They will use less fuel and cost less to maintain.
D．They will be charged at night when electricity costs less.
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