According to the passage, if a scientist wants to predict the way consumers spent their money, be must ______. ______ is most h

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问题 According to the passage, if a scientist wants to predict the way consumers spent their money, be must ______.
______ is most helpful to spending.

选项 A、Price increases
B、Price stability
C、Increasing incomes
D、Decreasing incomes

答案B

解析 细节题。答案在文章最后一段第一句。
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