单项选择题

Which of the following 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According to the passage, memory is considered to be （）

A．the basis for decision making and problem solving
B．an ability to store experiences for future use
C．an intelligence typically possessed by human beings
D．the data mainly consisting of words and combinations of words

单项选择题M: What are you doingW: Trying to get this wine stain(污渍)out of the carpet.M: Hang on. There’ s some soda here. It should take the stain right out.W: Really Hey（）

A. it is really functioning.
B. it is really working.
C. it is really playing.
D. it is really influencin