一道逻辑求解！！！

nymphl

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?

(A) The exhaust from Palitito's few automobiles is not a significant threat to Palitito's buildings.
(B) Palitito's Renaissance buildings are not threatened by pollution other than engine exhaust.
(C) Tour buses typically spend less than one-quarter of the time they are in Palitito transporting passengers from one site to another.
(D) More tourists come to Palitito by tour bus than by any other single means of transportation.
(E) Some of the tour buses that are unable to find parking drive around Palitito while their passengers are visiting a sit.
这道选C ，我选的是E ，能不能解释下啊？

xingzixin

我的理解是这样：

题目里讲了bus会做两件事：一件是driving(transporting pasengers)，另一件事idle。

idle和drive产生一样量的废气。

现在有了停车场，1/3的bus就不会idle了，所以污染就会下降。

C：bus花在transport的时间少于1/4。说明有3/4的时间都在idle。现在有了停车产，1/3的bus不用idle了，自然废气就少了。

E：不能停车的bus中有一些在idle。这个some就不好，有些idle，那另外一些在干什么是不知道的。所以到底废气下降不下降我们不知道，无关。

onedayling

我的理解是这样：

题目里讲了bus会做两件事：一件是driving(transporting pasengers)，另一件事idle。

idle和drive产生一样量的废气。

现在有了停车场，1/3的bus就不会idle了，所以污染就会下降。

C：bus花在transport的时间少于1/4。说明有3/4的时间都在idle。现在有了停车产，1/3的bus不

用idle了，自然废气就少了。

E：不能停车的bus中有一些在idle。这个some就不好，有些idle，那另外一些在干什么是不知道的。所以到底废气下降不下降我们不知道，无关。

liaoyoumin

这题我觉得选E是对的。

结论是控制非法毒品进口时失败的。
论据是: 如果成功的话，批发价就不会降低那么多， 意思是说毒品控制失败了，导致大量毒品进口，使当前批发价下降了。
问假设。

E是说需求的下降不是价格下降的唯一因素。实际上是排除了个人需求对价格的影响作用。排除他因。

希望对你理解有帮助。

xiaotangyu

idle 就是车打到P档，不关发动机，所以和开着车一样。

parking就是车的发动机关了，没有尾气排放了。