单项选择题

Which of the following does NOT characterize a normal patent

A．some extension of life span
B．some duration of validity
C．some form of reward
D．some kind of monopoly
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单项选择题
From the passage we might get the hint that ______.
A．the future television will have advanced transmission techniques
B．there will be more types of television
C．the future television will be more entertaining
D．the future television will be more interactive
单项选择题
The author of this passage is most probably ______.
A．American
B．British
C．Chinese
D．Australian
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