单项选择题

A．The poor.
B．The unemployed.
C．The old.
D．The young.
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单项选择题
A．He slept in the office.B．He went shopping for a clothes.C．He went to Mary’s house to see him.D．He did nothing at all.
A．He slept in the office.
B．He went shopping for a clothes.
C．He went to Mary’s house to see him.
D．He did nothing at all.
单项选择题
A．By taking out a patent on it.B．By building houses.C．By further perfecting his design.D．By telling others.
A．By taking out a patent on it.
B．By building houses.
C．By further perfecting his design.
D．By telling others.
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