已知集合A={-1，0，1，2}，B={-2，1，2}，则A∩B=[ ]
A.{1}
B.{2}
C.{1，2}
D.{-2，0，1，2}
答案：C
In order to win back the customers, the owner of the restaurant decided to sell his food ____.
A．in a discount
B．with discount
C．at a discount
D．for a discount
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