单项选择题

The ______ of the world 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
The computer can be programmed to ______ a whole variety of tasks.
A．assign
B．tackle
C．realize
D．solve
单项选择题
Being color-blind, Sally can't make a ______ between red and green.
A．difference
B．distinction
C．comparison
D．division
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