单项选择题

On January 1, 1901, the Commonwealth of Australia was born out of _________ early colonies.

A．6
B．8
C．13
D．15
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单项选择题
An inventor can generally make a big profit if he _________ his or her invention.
A．publishes
B．keeps secret
C．patents
D．sells
单项选择题
A dead patent is one that _________ .
A．no longer wins money
B．has expired
C．is plagiarized
D．is violated
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