请教一道逻辑题～ 高手进来赐教～ 感恩～

junny22cn

For years the beautiful Renaissance buildings in Palitito have been damaged by exhaust from the many tour buses that come to the city. There has been little parking space, so most buses have idled at the curb during each stop on their tour, and idling produces as much exhaust as driving. The city has now provided parking that accommodates a third of the tour buses, so damage to Palitito’s buildings from the buses’ exhaust will diminish significantly.

Which of the following, if true, most strongly supports the argument?

1. the exhaust from Palitito’s few automobiles is not a significant threat to Palitito’s buildings.
2. Palitito’s Renaissance buildings are not threatened by pollution other than engine exhaust.
3. Tour buses typically spend less than one quarter of the time they are in Palitito transporting passengers from one site to another.
4. More tourists come to Palitito by tour bus than by any other single means of transportation.
5. Some of the tour buses that are unable to find parking drive around Palitito while their passengers are visiting a site.

答案是:

C，请高手指点为什么是C选项。

[此贴子已经被作者于2009-6-14 13:29:45编辑过]

ghgriffin

答案是C 你弄错答案了

junny22cn

请问有谁会这题吗？

instantreply

C.

It means that atleast 75% of the time, buses are idled at the curb and and idling produces as much exhaust as driving as is evident from the argument.

This supports the argument. Once the parking is provided, it will accomodate a third of the tour buses reducing the pollution.

zhujinbo

关键点：条件的变化（停车场） 是否足以达到目标（减少damage ）

如果需要行驶的时间只有25%，那么条件的变化可以减少75%damage 。

crazyfight

4楼讲的很清楚了。

c选项说旅游车花少于1/4的时间把客人从一个地方载到另一个地方，如果没停车场的话，那些车就停着，同时排气；如果城市建更多的停车场，那些旅游车就能停了，减少了排气。故加强。

junny22cn

谢谢各位的参与讨论，我明白了～