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题库 / Prep2007E1-CR-20
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?
The exhaust from Palitito's few automobiles is not a significant threat to Palitito's buildings.
Palitito's Renaissance buildings are not threatened by pollution other than engine exhaust.
Tour buses typically spend less than one-quarter of the time they are in Palitito transporting passengers from one site to another.
More tourists come to Palitito by tour bus than by any other single means of transportation.
Some of the tour buses that are unable to find parking drive around Palitito while their passengers are visiting a site.
fact：building确实被exhaust damage 了（fact是不可以反驳的，所以选项中说到比如有其他的因素damage==》X）
premise：parking space少，所以很多车会在每一站停靠在路边，idling（挂空挡）造成的exhaust和driving是一样的。
结论：建造了更多的parking space==》bus的exhaust会显著的减少
gap：parking space建造好了==》（很多bus用这个space）==》（idle的时间少了）==》exhaust少了
strengthen的目的就是把这个逻辑链补清楚就可以了
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