单项选择题

The "insider " (line 1, paragraph 5) is most probably

A．someone who buys both Ariel and Cinch
B．someone who works within Procter &. Gamble or knows it fairly well
C．someone who once worked within Rakona
D．someone who is a loyal customer of Ariel
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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.
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
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