旧 prep 55 看了所有的帖还是有疑问

kelebonnie

55.    (34557-!-item-!-188;#058&007575)

According to the Tristate Transportation Authority, making certain improvements to the main commuter rail line would increase ridership dramatically.  The authority plans to finance these improvements over the course of five years by raising automobile tolls on the two highway bridges along the route the rail line serves.  Although the proposed improvements are indeed needed, the authority's plan for securing the necessary funds should be rejected because it would unfairly force drivers to absorb the entire cost of something from which they receive no benefit.

Which of the following, if true, would cast the most doubt on the effectiveness of the authority's plan to finance the proposed improvements by increasing bridge tolls?

(A) Before the authority increases tolls on any of the area bridges, it is required by law to hold public hearings at which objections to the proposed increase can be raised.
(B) Whenever bridge tolls are increased, the authority must pay a private contractor to adjust the automated toll-collecting machines.
(C) Between the time a proposed toll increase is announced and the time the increase is actually put into effect, many commuters buy more tokens than usual to postpone the effects of the increase.
(D) When tolls were last increased on the two bridges in question, almost 20 percent of the regular commuter traffic switched to a slightly longer alternative route that has since been improved.
(E) The chairman of the authority is a member of the Tristate Automobile Club that has registered strong opposition to the proposed toll increase.

此题的正确答案为D.  我看了其它的帖，大家的分析是 D选项说有20%的人选择另一条路，这样使two bridges 的toll 减少，从而会影响effectiveness of the authority's plan to finance the proposed improvements。 可是我认为，毕竟还有80%的人还是选择原来的bridges，只要这个 tolls 提高的幅度增大是可以弥补这流失的20%的人所要交的费用。所以我觉得D并没有构成削弱啊

tallhermit

lz有点钻牛角尖的意思~
那你看看我这样想能不能说服你~~
文章问你的是以下哪个选项会对政府所提倡的这个plan的有效性产生削弱的影响？
文章没有说以下哪个选项会造成这个plan无法实施，或流产
文章问的是有效性会减弱。。。
也就是说，在不考虑以下情况真实出现的条件下，政府按照他们的构想推行了这个plan，比如说让过桥费每辆车增加3刀，然后市民接受了这个plan，愿意多掏3刀，一切安好，那么effectiveness就是100%，但是现在出现一个情况，
有一小撮不安分守已的公民对这个plan质疑了，他们不愿意为政府买单，转而走其他的路了，此时政府的plan的有效性就打折扣了，因为他筹不到那么多的钱了，而且剩下的人任然还是会只掏3刀去过桥，但是政府i如果说不行啊，有一小撮人不愿意走，不想掏钱，所以你么剩下的80%的人去买100%的单，那么也就说你说的提高tolls的幅度来弥补损失，那么我继续钻下去，那80%的人中肯定有人不干了，行，老子不买账了，老子也跟那一小撮人一起不走这路了，政府的effectiveness再次被削弱，那么政府再继续说提价，又有人不走，结果继续抽不到钱，有效性继续下降，直到最后没有人会undertake，都不走这条路了，plan的有效性就变为0了。
所以，D选项是weaken了政府提出plan时构想的100%有效性的initial thought。
希望lz不要钻牛角尖，而且其他选项也没有D选项更为明确和直接，跟政府plan的有效性联系这么紧密，
不知道我解释是否清楚吧，反正是我自己的理解，供lz参考哈~~~

kelebonnie

明白啦~灰常感谢ls耐心详尽的解释~