单项选择题

A．At the customs.
B．At the airport.
C．At the supermarket.
D．At the post office.
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单项选择题
Opponents of our present tax program argue that it discourages from trying new fields of business activity.
A．entrepreneurs
B．sportsmen
C．colonists
D．mediators
单项选择题
Psychologists have succeeded in ______ parents' confidence in their own authority.
A．underrating
B．undervaluing
C．underplaying
D．undermining
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