单项选择题

The economic recession has meant that job ______ is a rare thing.

A．security
B．safety
C．protection
D．secureness
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单项选择题
The thieves fled with the local police close on their ______.
A．backs
B．necks
C．toes
D．heels
单项选择题
It is an offence to show ______ against people of different races.
A．distinction
B．difference
C．separation
D．discrimination
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