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.
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单项选择题
A．She agreed.B．She disagreed.C．She was impatient.D．She was worried.
A．She agreed.
B．She disagreed.
C．She was impatient.
D．She was worried.
单项选择题
A．Labour and education.B．Transportation and insurance.C．Utilities and repairs.D．Products and services.
A．Labour and education.
B．Transportation and insurance.
C．Utilities and repairs.
D．Products and services.
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