13. In an attempt to improve highway safety, Prunty County last year lowered its speed limit from 55 to 45 miles per hour on all county highways. But this effort has failed: the number of accidents has not decreased, and, based on reports by the highway patrol, many drivers are exceeding the speed limit. Prunty County should instead undertake the same kind of road improvement project that Butler County completed five years ago: increasing lane widths, resurfacing rough highways, and improving visibility at dangerous intersections. Today, major Butler County roads still have a 55 mph speed limit, yet there were 25 percent fewer reported accidents in Butler County this past year than there were five years ago.

　　Write a response in which you discuss what specific evidence is needed to evaluate the argument and explain how the evidence would weaken or strengthen the argument.

　　步骤：事故数量没减少 → 限速没用

　　假设：事故的严重性没变

　　反例：以前撞死人，现在撞伤人

　　证据：严重事故的变化

　　步骤：根据report很多人在超速 → 限速没用

　　假设：超速的人没减少;超速的人速度没降低

　　反例：超速的人已经大幅减少;以前超速超在80，现在超速超在65

　　证据：超速人数的对比;平均车速的对比

　　步骤：BC采取了一系列措施之后报告的事故少了25% → BC的措施起了作用

　　假设：没有它因

　　反例：人口少了;私家车少了

　　证据：调查实际车辆数量变化

　　步骤：BC的措施起作用了 → PC模仿可以一样有效

　　假设：两城的交通状况，路面条件相似

　　反例：我们的路已经很宽很平了，十字路口都很开阔;真正导致我们事故多的是超速，酒驾……

　　证据：根据我们的实际事故来源分析决定合理的应对方式

编辑：张雨

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