单项选择题

On the development of the electro-car, the main problem is ______.

A．nothing technical
B．electricity is too expensive
C．the speed of the car is not fast enough
D．the weight of the battery
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单项选择题
According to the author, the outlook for ending crime is _____.
A．rosy
B．unclear
C．hard to describe
D．bleak
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