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
<上一题 目录 下一题>
热门 试题

单项选择题
An inventor can generally make a big profit if he ______ his or her invention.
A．publishes
B．keeps secret
C．patents
D．sells
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
相关试题