单项选择题

Which of the following statements is not true

A．Robots will be less expensive than they are now.
B．They will be used as aides for the disabled.
C．They will all be gentle and kind.
D．They will deal with intruders.

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单项选择题

What's the author's attitude towards long-promised home robot

A．Optimistic.
B．Pessimistic.
C．Skeptical.
D．Disbelieving.

单项选择题

Which of the following is difficult for robots to do at present

A．To assemble machines.
B．To do some kinds of cleaning.
C．To work as service men.
D．To tell that the corner where walls and ceilings meet goes in, not out.