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【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
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根据网考网移动考试中心的统计,该试题:

54%的考友选择了A选项

7%的考友选择了B选项

8%的考友选择了C选项

31%的考友选择了D选项

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