The passage is mainly about ______. Which of the following statements is true according to the passage?

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问题 The passage is mainly about ______.
Which of the following statements is true according to the passage?

选项 A、When the price of a product goes up, there will be a greater demand for it.
B、It’s up to the customer as to how much he/she pays for certain goods.
C、Seller-producers have to keep immediate track of market in order to be successful.
D、Supply and demand are always well-balanced in a market-oriented economy.

答案C

解析
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