单项选择题

"A dead patent" is one that _________ .

A．no longer wins money
B．has expired
C．is plagiarized
D．is violated
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单项选择题
It can be inferred from the passage that _________ .
A．all the ideas "new" to us are actually old
B．some "new" ideas can make money without having to be commercialized
C．all "new" ideas first appeared in the form of a patent
D．some "new" ideas may not bring economic reward to their originators
单项选择题
Which of the following does NOT characterize a normal patent
A．some extension of life span
B．some duration of validity
C．some form of reward
D．some kind of monopoly
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