2004-10-B22

kangkangkang

看了答案还是没有明白这个pattern是什么，谁解释解释

All the evidence so far gathered fits both Dr. Grippen's

theory and Professor Heissmann's. However, the

predictions that these theories make about the result of

the planned experiment cannot both be true. Therefore,

the result of this experiment will confirm one of these

theories at the expense of the other.

The argument above exhibits an erroneous pattern of

reasoning most similar to that exhibited by which one

of the following?

(A)       David and Jane both think they know how to

distinguish beech trees from elms, but when

they look at trees together they often disagree.

Therefore, at least one of them must have an

erroneous method.

( B)      Although David thinks the tree they saw was a

beech, Jane thinks it was an elm. Jane's

description of the tree's features is consistent

with her opinion, so this description must be

inconsistent with Dm/ id's view

(C)       David and Jane have been equally good at

identifying trees so tar. But David says this

one is an elm, whereas Jane is unsure.

Therefore, if this tree turns out to be an elm,

we'll know David is better.

(D)       David thinks that there are more beeches than

elms in this forest. Jane thinks he is wrong.

The section of forest we examined was small,

but examination of the whole forest would

either confirm David's view or disprove it.

(E)       David thinks this tree is a beech. Jane thinks it

is an elm. Maria. unlike David 01 Jane, is

expert at tree identification, so when Maria

gives her opinion it will verify either David's

or Jane's opinion.

dphxmg

Tested by C, A and B cannot both be true. This can imply the following statements:
1. Both A and B are wrong.
2. A is true and B is wrong.
3. B is true and A is wrong.

Situations 2 and 3 and be summarised as that either A or B is true.

The argument is:
Premise： A and B cannot both be true.
Conclusion: 2 and 3.
Where is 1?!

E is the key.

[此贴子已经被作者于2008-1-2 6:02:06编辑过]

kangkangkang

明白了，多谢