填空题

My parents are (concern) ______ about my health.

【参考答案】

concerned
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单项选择题
Which of the following can be an example of the use of money in exchange for services
A．To sell a table for $20.
B．To get paid for your work.
C．To buy things you need or want.
D．To get some money for old-fashioned T-shirt.
单项选择题
According to the passage, if a scientist wants to predict the way consumers spent their money, be must ______.
A．study consumer behavior
B．obtain data on the incomes of consumers
C．get data on money spending motives
D．do all of the above
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