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
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单项选择题
Psychologists have succeeded in ______ parents' confidence in their own authority.
A．underrating
B．undervaluing
C．underplaying
D．undermining
单项选择题
The streets are ______ with people.
A．live
B．lively
C．living
D．alive
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