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单项选择题

If we take a most frequently used long dining table as an example, which of the following is not appropriate when arranging the seats of a west dinner? A.
The host and the hostess can be seated at the two ends of the table. B.
The host and the hostess can be seated face to face in the middle of the table. C.
 The guest of honor should be seated at the right hand of the host or the hostess. D.
 The guest of honor should be seated at the left hand of the host or the hostess.

问答题

试述总供给曲线的种类（特征）。