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

<上一题目录下一题>

热门试题

单项选择题

填空题

milk

On the development of the electro-car, the main problem is ______. 您的浏览器不支持 audio 元素。