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题库 / Prep2007E1-CR-18
Many small roads do not have painted markings along their edges. Clear edge markings would make it easier for drivers to see upcoming curves and to judge the car's position on the road, particularly when visibility is poor, and would therefore seem to be a useful contribution to road safety. However, after Greatwater County painted edge markings on all its narrow, winding roads, the annual accident rate along those roads actually increased slightly.
Which of the following, if true, most helps to explain the increase in accident rate?
Greatwater County has an unusually high proportion of narrow, winding roads.
In bad weather it can be nearly as difficult for drivers to see the road as it is at night.
Prior to the painting of the edge markings, Greatwater County's narrow, winding roads already had a somewhat higher accident rate than other Greatwater County roads.
Many of the accidents on narrow, winding roads involve a single vehicle veering off the road, rather than the collision of two vehicles.
After the markings were painted on the roads, many drivers who had gone out of their way to avoid driving on those roads at night no longer did so.
本来应该：标清路的边→开车更安全；
但现在没有，然并卵
加强，即看看”本来“与”现在“间的不同点
A、本来路就窄，与标不标清楚边、安全无关
B、坏天气看不见路，列举特殊情况，与标不标清楚边、安全无关
C、标清边之前，一些更窄的路事故更多，主要对比的是宽窄，无法削弱我们需要的那个因果联系，不是”本来“/”现在“对比
D、一个车出事故比两车多，无法削弱我们需要的那个因果联系，不是”本来“/”现在“对比
E、标清边后，本来一些车绕道走→现在它们不了；证明”本来“与”现在“的不同，削弱标边和安全的因果联系，CORRECT
可以这么理解吗： e是在说在这种路上开车的人变多了？所以可能的车祸也会增多？
在DE里纠结：D貌似有道理，但顶多想表达的意思是这个marking对a single vehicle veering off the road车祸没用，并不能解释为什么增加；虽然E中go out of one's way to do这里意思看不懂，但整体说的应该是marking后给司机的驾驶带来改变（好的或坏的），既然ABCD都排除了，那么带来的改变猜猜应该是坏的。
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make it easier for drivers to see upcoming curves and to judge the car's position on the road，看到接下来的转弯和车子所处的位置。
D，很多车祸是因为车子开出车道，而不是因为两车相撞。
D表明program可以降低车祸率，题目是实施program后，车祸率上升了。
目标：to be a useful contribution to road safety
方案：painted edge markings on all its narrow, winding roads
评估方向：CQ3 方案否定性副作用，C 和 E提出了方案，保留，但C不能说明和方案的联系，排除， E由于划线后之前不在晚上行驶的车辆，现在晚上都在行驶。