单项选择题

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

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