One significant improvement in the future car will probably be______. What provides autos with electric power in an automated h

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问题 One significant improvement in the future car will probably be______.
What provides autos with electric power in an automated highway system?

选项 A、A rail.
B、An engine,
C、A retractable arm.
D、A computer controller.

答案A

解析此题的依据为第四段第一句"...and make contact with a rail，which is similar to those powering subway trains electrically"．定语从句中的关系代词which代指前面的a rail，所以本题答案应该是A项。

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GCT工程硕士（英语）

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