怎样从文章中提炼充分和必要条件的思路，哪位大牛给总结下~~

Bichenfei928 · 发表于 2010-10-14 14:42:56

顺便摆上狒狒逻辑的一道例题：
97. A scientific theory is a good theory if it satisfies two requirements: it must accurately describe a large class of observations in terms of a model that is simple enough to contain only a few elements, and it must make definite predictions about the results of future observations. For example, Aristotle’s cosmological theory, which claimed that everything was made out of four elements---earth, air, fire, and water---satisfied the first requirement, but it did not make any definite predictions. Thus, Aristotle’s cosmological theory was not a good theory.
If all the statements in the passage are true, each of the following must also be true EXCEPT:
(A) Prediction about the results of future observations must be made by any good scientific theory
(B) Observation of physical phenomena was not a major concern in Aristotle’s cosmological theory.
(C) For elements can be the basis of a scientific model that is simple enough to meet the simplicity criterion of a good theory.
(D) A scientific model that contains many elements is not a good theory.
(E) Aristotle’s cosmological theory described a large class of observations in terms of only four elements.

fujianaicd · 发表于 2010-10-14 16:29:54

a few elements model + 【predictions => good theory】
Aristotle's theory(a few elements model+【no prediction) => not good theory】

足见prediction 和 good theory是充要关系

=>
good theory<=>prediction

所以选A

Bichenfei928 · 发表于 2010-10-14 22:44:23

这道题狒狒上的答案是B么...我想知道A为什么是错的，B明显是错的因为physical phenomenon是一个无关的概念

怎样从文章中提炼充分和必要条件的思路，哪位大牛给总结下~~

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