标题: 一道关于假设的题目 [打印本页] 作者: 331589698 时间: 2013-6-18 15:03 标题: 一道关于假设的题目 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.
(E) The increased sightings of bird species in and around London reflect an actual increase in the number of species in the area.
premise1 : In the years since the city of London imposed strict air-pollution regulations on local industry
在最近几年，因为伦敦对当地的工业施加了很严格的空气污染管理条例
premise2 : the number of bird species seen in and around London has increased dramatically
在伦敦市中心和周围，能被看到鸟类的种类增加得非常多
conclusion: Similar air-pollution rules should be imposed in other major cities
相似的严格的空气污染管理条例应该被施加在其他大城市
premise1 + premise2 →conclusion，很显然一步无法推出
因为箭头上有一些gap，比如后四个选项是作者默认确认的假设：
(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.
(E) The increased sightings of bird species in and around London reflect an actual increase in the number of species in the area.