单项选择题

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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单项选择题
A robot can be used to expand our frontiers when ______.
A．its intelligence and cost are beyond question
B．it is able to bear the rough environment
C．it is made as complex as the human brain
D．its architecture is different from that of the present ones
单项选择题
The underlined word carbon (Para. 2) stands for ______.
A．intelligent robots
B．a chemical element
C．an organic substance
D．human beings
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