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
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
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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