单项选择题

The word "plagiarize" (Line 4, Para. 5) most probably meas "______".

A．steal and use
B．make public
C．give reward to
D．take and change
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单项选择题
From the passage we learn that ______.
A．an invention will not benefit the inventor unless it is reduced to commerical practice
B．products are actually inventions which were made a long time ago
C．it is much cheaper to buy an old patent than a new one
D．patent experts often recommend. patents to others by conducing a search through dead patents
单项选择题
The passage is mainly about ______.
A．an approach to patents
B．the application for patents
C．the use of patents
D．the access to patents
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