单选题What provides autos with electric power in an automated highway system?AA rail.BAn engine.CA retractable arm.DA computer controller.
单选题
What provides autos with electric power in an automated highway system?
A
A rail.
B
An engine.
C
A retractable arm.
D
A computer controller.
参考解析
解析：
细节题。在自动化公路系统中，给该系统提供能源的只能是轨道。第四段提到，一个可伸缩性的手臂从汽车上垂落下来，接触到铁轨，这个铁轨类似于电动地铁，给地铁提供能源的铁轨，给汽车提供电流，动力源。A项“铁轨”与文章相同，故A为答案。
细节题。在自动化公路系统中，给该系统提供能源的只能是轨道。第四段提到，一个可伸缩性的手臂从汽车上垂落下来，接触到铁轨，这个铁轨类似于电动地铁，给地铁提供能源的铁轨，给汽车提供电流，动力源。A项“铁轨”与文章相同，故A为答案。
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