单项选择题 M: What an accident! If you had been careful．things would not be as they are． W: What do you mean，it was my fault? If it were, surely I would take all responsibility for it. Q: What does the woman mean?（）

单项选择题 A．JAFFSB．formatC．file systemsD．protocol

单项选择题 根据杜能区位理论，某个农业经营者是否能在单位面积土地上获得最大利润，将由农业生产成本、农产品的市场价格和（）三个因素所决定。