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单项选择题

How many of new Silent Riders were in regular service at the moment

A．None.
B．Twenty.
C．Fifty.
D．On
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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

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