单项选择题

The passage is mainly about ______.

A．the use of patents
B．the access to patents
C．an approach to patents
D．the application for patents
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单项选择题
Which of the following is TRUE according to the passage
A．A patent holder must publicize the details of his invention when its legal period is over.
B．When a patent becomes out of effect, it can be re-patented or extended if necessary.
C．It is necessary for an inventor to apply for a patent before he makes his invention public.
D．One can get all the details of a patented invention from a library attached to the patent office.
单项选择题
The word plagiarize in Paragraph 4 most probably means ______.
A．make public
B．give reward to
C．steal and use
D．take and change
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