题目内容
需求价格弹性是指需求量对成本变动的反应程度()
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Zheng decided to fly to London and stay there for one year.
Zheng wanted to prove that a person can still fulfill his dream even though he doesn't have much money.
When Zheng was lost one night, an American driver stopped his car and took Zheng to his house to spend the night.
Zheng's knees were still painful from his injuries, so he thought his journey was not worthwhile.
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