单项选择题

The annual flooding is caused by melting snows on the high Ethiopian Plateau, from which the Nile ______.

A．traced
B．sourced
C．originated
D．resided
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单项选择题
I had the pleasure of ______ with your husband in the states when he was lecturing there three years ago.
A．knowledge
B．identification
C．acquaintance
D．recognition
单项选择题
When Bob was eighteen, he ______ going around with a strange set of people and staying out very late.
A．took to
B．took up
C．took for
D．took on
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