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【单选题】
食品的需求价格弹性通常很小，原因是
A.
占消费者支出的比例较高
B.
消费者做转变所需的时间周期过长
C.
是生活必需品且替代品难寻
D.
因人而异，无法判断
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【单选题】Which of the following does not account for young adults returning to the nest?
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