08prep Q98 新问

claire66

   Early in the twentieth century, Lake Konfa
became very polluted.Recently fish populations have recovered as release of industrial pollutants has declined and the lake’s waters have become cleaner.Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again.However, a technology for preventing leaks is being installed.Therefore, provided this technology is effective, those fears are groundless.


The argument depends on assuming which of the following?



A. Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.

B. There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa
.
C. The bottom of the lake does not contain toxic remnants of earlier pollution that will be stirred into the water by pipeline construction.  （答案~~~）

D. Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.

E. The species of fish that are present in Lake Konfa
now are the same as those that were in the lake before it was affected by pollution.

我逻辑一直不太好。这个题目看过以前的讨论，大家都在纠结B，可我这个脑袋瓜就是不靠谱，一直弄不明白D为什么错。
如果D 取费，不止漏油这个事情会造成污染，这样就可以削弱了呀：装了防漏油的东西也没有用，所以还是要担心污染的问题的。这样理解有什么错么？

assumption题目是我的症结，一直是跟着感觉做，时对时错，每个选项取非有很耗时间，即使取非了也会出现像我这个题里范的错误。。。很纠结，请大牛牛指教~~谦虚的牛牛也可以来一起探讨下关于assumption题目的做法问题。

maestri

说说我的看法：

D选项：pipeline漏油带来的唯一harm是危害鱼群。
首先:根据题干，不会发生漏油（provided this technology is effective），该选项与题干相违背
其次:会不会只对鱼群危害和该fear是否有道理无关

C选项：河底没有有毒残漏，这样安装pipeline时就不会二次污染了。

注意的是： the planned construction of an oil pipeline might revive pollution这里其实可以分为两层意思
一层是“泄露的污染”，根据题干已经派出
一层是“安装时带来的污染”，即C选项

DUKB24

注意推理的题干中说given the method is effective...这里作者已经assume油是不可能漏的，LZ好好体会下整个推理链的书写，这个才是crack CR的核心啊