单项选择题

The“progressive tax”is the tax_______ .

A．collected for social progress
B．that increases with each passing year
C．that is collected from those who earn most
D．that varies according to how much money a person earns

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单项选择题

Social security tax is collected from_______ .

A．those who have broken the law
B．those who often make trouble
C．those whose lives and property are in danger
D．every citizen living in the area

单项选择题

Keys should never be hidden around the house since thieves _______ know where to find them.

A．virtually
B．unavoidably
C．reliably
D．invariably