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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单项选择题
The chief feature of the two mansions was ______.
A．the stairwell and the skylight
B．the rich stucco molding
C．the handsome fireplaces
D．the magnificent woods
单项选择题
The two houses were not ______.
A．of the same style
B．designed by the same designer
C．the same looking from the outside
D．the same looking from the inside
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