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
Now the cheers and applause______in a single sustained roar.
A. mingled
B. tangled
C. baffled
D. huddled
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