单项选择题

Many Southerners ______ runaway slaves during the Civil War.

A．avoided
B．shaded
C．prevented
D．sheltered

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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

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

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