标题: 大全－B－2 [打印本页] 作者: rt316 时间: 2003-10-31 07:31 标题: 大全－B－2 Test B 2.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. 显示正确答案是A，但是觉得应该是D 如果A取非，那么，结论必不成立，因为原regulations是针对local industry而起作用的，若其他地方的local industry不是主要污染源，那么，类似的regulations就无法起到有效作用。