单项选择题

A．Labour and education.
B．Transportation and insurance.
C．Utilities and repairs.
D．Products and services.
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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.
单项选择题
A．A druggist.B．An addict.C．physician.D．A dentist.
A．A druggist.
B．An addict.
C．physician.
D．A dentist.
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