单选题：A robot can be used to expand our frontiers when __________

题目分类：英语三级A级
题目类型：单选题
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题目内容：

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

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