单项选择题

The word "carbon" (Line 5, Par

A．2) Stands for ______.A. intelligent robotsB. a chemical elementC. an organic substanceD. human beings
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单项选择题
What does the writer think about machines with human-like ability
A．He believes they will be useful to human beings.
B．He believes that they will control us in the future.
C．He not quite sure in what way they may influence us.
D．He doesn't consider the construction of such machines possibl
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 completes as the human brain
D．its architecture is different from that of the present ones
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