1、错误类比 两个城市不一样，很可能因为西和东的不一样，比如，路的情况traffic condition。可能东的车辆更好。服务的态度更好。
而且没有说东的志愿情况如何，很可能东的志愿比商业的快。
2、草率的判断：就算是商业的更快，也不一定更好。反映时间不是的因素，有其他——比如服务的质量，态度，器材等等。
3、另外，除非商业可以charge considerable fees 或者 accident rate非常高，否则未必带来可观的revenue。
1.response time 并不是衡量服务质量的标准
2.West 和East情况不同，不能比较，比如West的交通很差
3.commercial必须要收取一个比较高的fee才能使town得revenue上升，具体数字未给出
北美范文：
In this argument the author concludes that West Cambria can increase revenues and provide better care to accident victims by disbanding the volunteer ambulance service and hiring a commercial one. The author reasons that this change would yield additional revenues because service fees could be imposed for ambulance use. The author also reasons that the city would provide better service to accident victims because a commercial service would respond more quickly to accidents than a volunteer service would. The author’s argument is flawed in two respects.
To begin with， the author’s plan for raising revenue for West Cambria is questionable. Unless the service fees are considerable or the accident rate is extremely high， it is unlikely that significant revenues will be raised by charging a fee for ambulance use. Consequently， revenue generation is not a good reason to disband the volunteer service and hire a commercial service.
Next， the author’s belief that better patient care would be provided by a commercial ambulance service than by a volunteer service is based on insufficient evidence. The fact that the commercial service in East Cambria has a lower average response time than the volunteer service in West Cambria is insufficient evidence for the claim that this will be the case for all commercial services. Moreover， the author’s recommendation depends upon the assumption that response time to an accident is the only factor that influences patient care. Other pertinent factors—such as ambulance-crew proficiency and training， and emergency equipment—are not considered.
In conclusion， this argument is unconvincing. To strengthen the argument the author would have to show that substantial revenue for the town could be raised by charging service fees for ambulance use. Additionally， the author would have to provide more evidence to support the claim that commercial ambulance services provide better patient care than volunteer services.
