单项选择题

We can't choose whether we will pay income tax or not, for payment of income tax is ______.

A．compulsory
B．voluntary
C．arbitrary
D．dutiable
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单项选择题
As we all know, the same gestures may have different ______ which vary from one culture to another.
A．implications
B．presumptions
C．expressions
D．assumptions
单项选择题
As a good employer, he knows how to make full use of the ______ of his employees' talents and abilities.
A．validity
B．integrity
C．diversity
D．versatility
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