题目内容
（请给出正确答案）
What is the passage mainly about？
A. Selling and buying.
B. What is the market？
C. Everything you do is producing for the market.
D. What the market can do for you？
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
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A、Reporters should attribute all information that they did not see or hear themselves to a source or that is not a known fact.
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A、a. willingness to pay of the marginal buyer.
B、b. quantity buyers will ultimately purchase of the product.
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D、a large tariff imposed by a large country.
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B、Speeches on fact
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