单项选择题

A．little
B．few
C．much
D．many
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单项选择题
A．unlessB．ifC．asD．since
A．unless
B．if
C．as
D．since
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 repatented 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.
Which of the following is TRUE according to the passage A ) When a patent becomes out of effect, it can be repatented 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.
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