单项选择题

According to the passage, which of the following is not true about Ariel

A．It is the best seller in Czechoslovakia.
B．It is a laundry detergent product.
C．Ariel was born outside the United States.
D．It already becomes popular in Europe.

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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

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