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A．joining
B．passing
C．hold up
D．leading
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单项选择题According to the passage people tend to buy more when ______.

A．prices are expected to go up
B．prices are expected to go down
C．prices don't change
D．business policy remains unchanged

单项选择题The best title of the passage is ______.

A．Consumer's Purchasing Power
B．Relationship between Income and Purchasing Power
C．Traditional Assumptions
D．Studies in Consumer Behavior