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消费者的收入一定，用于消费AB两种商品，根据恩格尔加总规则可知下列判断中一定正确的是（ ）。
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消费者的收入一定，用于消费AB两种商品，根据恩格尔加总规则可知下列判断中一定正确的是（ ）。

A 如果A是正常品，则B必定是正常品
B 如果A为劣质品，则B必为劣质品
C 如果A是正常品，则B必定是劣质品
D 如果A为劣质品，则B必定是正常品

正确答案
D
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