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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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
单项选择题
If someone works around the clock, it means ______.
A．he likes his job
B．he works non-stop
C．he is very punctual
D．he repairs clocks and watches
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