单项选择题

is the last sentence, the word "they" refers to ______.

A．cash and credits
B．buyers and sellers
C．return privileges
D．all the factors
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单项选择题
What is the best title for the passage
A．The Inherent Weaknesses of the Price System.
B．Credit Terms in Transactions.
C．Resource Allocation and the Public Sector.
D．The Complexities of the Price System.
单项选择题
the paragraph following this passage most likely discusses ______.
A．types of payment plans for service
B．unusual ways to advertise products
C．how certain elements of a price "package" influence its market value
D．theories about how products affect different levels of society
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