单项选择题

All young men are required to do two years of______ military service.

A．obliged
B．indispensable
C．compulsory
D．compelling
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单项选择题
Many rare species of plants and animals are threatened with______ with the worsening of environment and mass hunting.
A．extinction
B．migration
C．destruction
D．extraction
单项选择题
This could be the result of laziness or______ which would lose him his customers or his job.
A．integrity
B．denial
C．deduction
D．incompetence
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