单项选择题

If a consumer wants a quick settlement of his problem, it's better to complain to ______.

A．a shop assistant
B．a store manager
C．the manufacturer
D．a public organization
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单项选择题
Humans and robots worked together in many areas of work because ______.
A．robots never complain about the tiring work
B．the management can pay little and benefit a lot
C．it is dangerous for humans to do some harmful work
D．they have their own weaknesses and advantages
单项选择题
The author is ______ about the future development of robots.
A．worded
B．pessimistic
C．optimistic
D．indifferent
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