单项选择题

The ______ of the word is unknown, but it is certainly not from Greek.

A．origin
B．generation
C．descent
D．cause
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单项选择题
Being colour-blind, Sally can't make a ______ between red and green.
A．difference
B．distinction
C．comparison
D．division
单项选择题
As the manager was away on a business trip, I was asked to ______ the weekly staff meeting.
A．preside
B．introduce
C．chair
D．dominate
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