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
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单项选择题
The author is ______ about the future development of robots.
A．worded
B．pessimistic
C．optimistic
D．indifferent
单项选择题
The central idea conveyed in the passage is that ______.
A．although robots can do much dangerous and tiring work, humans are superior
B．although humans are superior, robots can do much better in many areas of work
C．robots will replace humans in more and more fields
D．robots are superior to humans because they can do much work that humans can't do
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