单项选择题

Battery buses have some advantages over conventional buses. Which of these advantages is not mentioned in the passage

A．They use less fuel.
B．They make less noise.
C．They produce less pollution.
D．They cost less to produce.
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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 noise.
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．One.
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