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mechanisms
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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．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.
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