单项选择题

To take care of a light house, one must ______.

A．clean the windows around the light
B．sweep the ice and snow in the street
C．burn the candles
D．entertain the visitors
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单项选择题
The Northern industrialists were quick to take to tipping because ______.
A．they thought they were richer than the Southern slave owners
B．they were winners in the Civil War
C．they wanted to show off their fortune
D．they wanted to learn from the Southerners
单项选择题
What sweater did the customer decide to exchange for in the end
A．A black one.
B．A plainer one.
C．A cheaper one.
D．A red one.
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