单项选择题

According to the passage, the price system is related primarily to ______.

A．products and services
B．transportation and insurance
C．labour and education
D．utilities and repairs
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单项选择题
According to the passage, which of the following is NOT a factor in the complete understanding of price
A．The quality of a product.
B．Warranties that cover a product.
C．The quantity of a product.
D．Instructions that come with a product.
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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