单项选择题

The designer has applied for a __________ for his new invention.

A．tariff
B．discount
C．version
D．patent
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单项选择题
A good education is an __________ you can fall back on for the rest of your life.
A．asset
B．ethic
C．inventory
D．obligation
单项选择题
Giving a gift can convey a wealth of meaning about your appreciation of their __________ and the importance you place upon the relationship.
A．solidarity
B．priority
C．superiority
D．hospitality
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