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.
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How many of new Silent Riders were in regular service at the moment
A．None.
B．Twenty.
C．Fifty.
D．One.
单项选择题
Which one of the four figures was the designer of the two mansions
A．James W. Phillips.
B．Alexander Jackson Davis.
C．Thurlow Weed.
D．John Rogers.
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