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

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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 is not quite sure in what way they may influence us.
D．He doesn't consider the construction of such machines possible.

单项选择题

To prevent viruses from spreading, we should ______.

A．shake hands with our friends instead of kissing them
B．never touch the telephones, towels or plates
C．often wash our hands
D．often rub our noses and eyes