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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.
D:关键在于bus 正在污染环境，而不在于巴士载了多少乘客；具体地说，加入旅游观光巴士的路线数量每天都是固定的，那么乘客不管搭乘与否，巴士都照样会开，照样污染环境；题中没有说，乘客乘得多，巴士数量才会多，如果乘客数目再多，巴士数量也固定，那么D选项就无关了
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