Passage One Questions 16 to 18 are based on the passage you have just heard. Passage Two Questions 19 to 21 are based on the passage you have just heard. Passage Three Questions 22 to 25 are based on the passage you have just heard.
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皮皮学刷刷变学霸
举一反三
【简答题】Explain the two main causes of market failure and give an example of each.