单项选择题

Which can be cited as an example of the use of money in exchange for services

A．To sell a bicycle for $ 20.
B．To get some money for old books at a garage sale.
C．To buy things you need or want.
D．To get paid for your work.
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单项选择题
So little______ about mathematics that the lecture was completely beyond me.
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The house is very big and beautiful. I think the rent must be______as that one.
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