[讨论]再问test B 第2题

freedownload

In the years since the city of London imposed strict air-pollution regulations on local industry, the number of bird species seen in and around London has increased dramatically. Similar air-pollution rules should be imposed in other major cities.

Each of the following is an assumption made in the argument above EXCEPT:

(A) In most major cities, air-pollution problems are caused almost entirely by local industry.

(B) Air-pollution regulations on industry have a significant impact on the quality of the air.

(C) The air-pollution problems of other major cities are basically similar to those once suffered by London.

(D) An increase in the number of bird species in and around a city is desirable.（A）

(E)    The increased sightings of bird species in and around London reflect an actual increase in the number of species in the area.

我还是不清楚A为什么不是assumption

London制定了regulation限制local industry就有成效了，那么说其他城市可以学习，那么，其他主要城市的空气污染也是local industry造成的，有什么不对，可能就是entirely看了有点不顺眼。

麻烦NN给说说，谢谢！

番茄炒蛋

这里就是 entirely 的问题

有没有这个定语导致的结果会相差很多

其实只要是对企业的污染限制应该就会提高环境质量，并不一定是要假设企业污染是这个城市的主要污染源，汽车也有可能的，或者养猪养牛也可能啊，呵呵，在做假设题的时候，还是要多看看那些限制作用的定语，很容易错在上面

kevintong

对，是个程度问题。

不能因为imposed strict air-pollution regulations on local industry，就认为local industry is the only souce of pollution.

gmat700+

看很多人都问了这个问题，但是好像没一个人是问B的。我觉得应该选B啊！

(B) Air-pollution regulations on industry have a significant impact on the quality of the air.

我觉得B不是结论最直接的assumption。London对其地方工业实行了空气污染的控制法规，然后发现London的鸟儿多了。结论是：其他城市也应该对他们的工业实行这样的法规。我怎么也想不通B怎么能直接把论据和结论联系起来呢？如果结论是：其他希望通过提高空气质量来吸引鸟的城市也应该对他们的工业实行这样的法规，那么B才算是assumption。

哪位NN能解释一下？

mindfree

GMAT700+,

I see your point. But I think there is clear link here by common sense. First of all, it is air-pollution regulations. So we know that the effect is clean air. And better air quality will serve birds better thus attracting more birds. It is just like better working environment will attract better employees.

dream1111

A is wrong, because 'Almost entirely' does destroy the assumption. But

how can B be an assumption ?  Mindfree's explanation  makes a sense, nevertheless it sounds not very safe to take it.

Any ideas about how to define the scope of common sense?