单项选择题

The passage is mainly about______.

A．how patents are applied
B．an approach to patents
C．the usage of patents
D．the access to patents
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单项选择题
The word plagiarize'(Line 6, Para 5) most probably means ______ .
A．steal and use
B．publicize
C．provide reward to
D．take and change
单项选择题
Which of the following is TRUE according to the passage
A．When a patent becomes out of effect, it can be re-patented or extended if necessary.
B．One can get all the details of a patented invention from a library attached to the patent office.
C．A patent holder must publicize the details of his invention when its legal period is over.
D．An inventor needs to apply for a patent before he makes his invention public.
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