2. 外语
  3. The passage is mainly about ______ . Which of the following is true according to the passage?

The passage is mainly about ______ . Which of the following is true according to the passage?

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问题 The passage is mainly about ______ .
Which of the following is true according to the passage?
选项 A、When a patent becomes out of effect, it can be re-patented or extended if necessary.
B、It is necessary for an inventor to apply for a patent before he makes his invention public.
C、A patent holder must publicize the details of his invention when its legal period is over.
D、One can get all the details of a patented invention from a library attached to the patent office.
答案C
解析 是非题。根据第二段，一个发明获得专利后，其发明人在一定时期内对它拥有垄断，但当专利到期后，专利拥有者必须将发明的全部细节公之于众。因此B不合本句意思，而C与此符合。在第三段讲，只有在特别例外的情况下，专利的期限才可以延长，故A与此不符。而根据第五段，在图书馆中只可查到已过期的专利的详细资料，所以D也不对。
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