单项选择题

The passage is mainly about______.

A．how patents are applied
B．the usage of patents
C．an approach to patents
D．the access to patents
<上一题 目录 下一题>
热门 试题

单项选择题
Georges Valensi's patent lasted until 1971 because______.
A．nobody would offer and reward for his patent prior to that time
B．his patent could not be put to use for an unusually long time
C．the color TV receiver was not available until that time
D．there were not enough TV stations to provide color programmes
单项选择题
The word plagiarize'(Line 6, Para 5) most probably means ______ .
A．steal and use
B．provide reward to
C．publicize
D．take and change
相关试题