GWD8 38

linglingdan

Unless tiger hunting decreases, tigers will soon be extinct in the wild. The countries in which the tigers’ habitats are located are currently debating joint legislation that would ban tiger hunting. Thus, if these countries can successfully enforce this legislation, the survival of tigers in the wild will be ensured.

The reasoning in the argument is most vulnerable to criticism on the grounds that the argument  
A.    assumes without sufficient warrant that a ban on tiger hunting could be successfully enforced
B.    considers the effects of hunting on tigers without also considering the effects of hunting on other endangered animal species

C.    fails to take into account how often tiger hunters are unsuccessful in their attempts to kill tigers

D.    neglects to consider the results of governmental attempts in the past to limit tiger hunting

E.     takes the removal of an impediment to the tigers’ survival as a guarantee of their survival  

D为什么错？E为什么对？请高手帮忙分析一下

linglingdan

那是不是可以总结出一条关于“有关无关的思路”就是——过去的和现在的事无关？

besttys

要承认，政府原来的努力、效果如何是完全另一单的事，与本次的“政府政策--->老虎必然存活”的事件无关的。
从另外一个方面说，“政府原来的努力、效果如何”完全是个模糊的信息、不知道如何，不支持也不削弱。

linglingdan

可是这两个选项不是都是对没有阐述对象的一种补充完整吗？而且都和原文产生了关系。。

besttys

试解释

D. 政府原来的努力，与政府新政策将来的效果，两者的关系原文没有提及；而且比较这两个不知是否与老虎的数量有关联，所以无关。
"A-->B"  D项是将A与某C元素比较，无意义。

E. 正确，因为原文的推论只考虑了政府政策，没有排除其他可能的不利因素（比如老虎数量低于可繁殖的数量等），缺少很多假设。
"A-->B"  E项是质疑此推理过程，正确。