逻辑链条始终理不清，谁来帮帮我

yanxihua00 · 发表于 2011-3-8 17:13:30

Some soil scientists have asserted that decaying matter on the forest floor is
a far greater source of acidity in mountain lakes than is the acid rain that falls on these lakes.
Therefore, they contend, reducing acid rain will not significantly reduce the acidity levels of mountain lakes.

Which of the following statements, if true, most seriously weakens the argument above?

A. It is natural for mountain lakes to have acidity levels higher than those of other lakes.
B. The harmful effects of increased acidity levels in lakes have been greatly underestimated.
C. Acid rain is found in urban and heavily industrialised regions of the country.
D. There is much disagreement among soil scientists about the causes of acid rain.
E. While plant life remains, acid rain significantly increases the amount of decaying organic matter in natural environme
其实根据大概分析，有关无关排除就是E选项，大概意思也能明白，可是逻辑线条就是出不来？是不是我的理解能力有问题？有些题始终不明白逻辑线条，只能靠有关无关来判断，怎么办啊？？ help me ~

sdcar2010 · 发表于 2011-3-8 23:07:19

This is a kind of math problem.

Premise:
Decaying matter on the forest floor creates more acidity in mountain lakes than acid rain does.

Conclusion:
Reducing acid rain will not significantly reduce the acidity levels of mountain lakes

The assumption these scientists have is that "decaying matter" and "acid rain" are two parallel, ISOLATED sources of acidity. They do not interact with each other.

To weaken this conclusion, we need to find something to attack this assumption. E does that by linking the two things together. More acid rain can cause more decaying matter!

yanxihua00 · 发表于 2011-3-9 09:01:31

谢谢，我觉得你很牛，请问做逻辑题时，把逻辑链条找出来是靠多做题呢？还是有什么方法？

sdcar2010 · 发表于 2011-3-9 10:18:23

Practice definitely helps. But first, you need to have good fundamentals. For example, if after reading the stimulus once, you can tell which is the premise and which is the conclusion of the argument, you will get at least 50% chance of picking the correct answer later because most of the answer are "out of scope". Read some introduction of logical reasoning, you will see through most of the tricks in CR.

逻辑链条始终理不清，谁来帮帮我

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