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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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.
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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