单项选择题

Mr. White works with a chemicals import & export company, but he_________for this industrial fair, since he is on leave.

A．has worked
B．works
C．has been working
D．is working
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单项选择题
Carey had retired as usual after dinner for a little ______ in the drawing-room, but he was in an irritable mood and could not sleep.
A．snooze
B．sniff
C．snore
D．sneeze
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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