单项选择题

Although he has become rich, he is still very ______ of his money.

A．economic
B．thrifty
C．frugal
D．careful
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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
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
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