[求助]费费逻辑97

kenlily

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

A为什么能从文中推出? good theory要符合两个条件,但是符合其中一个条件的并不见得就是good theory啊

superkun

A->B 的意思是，只要有B（必要条件），A才能成立；如果有了A，就一定有B。所以本题既然A－>(B+C)是成立的，只要有A就一定能推出必要条件B和C。

这是偶的理解！

monicars

up.此题A还是不对。如果A->(B+C),怎么能说B只来自于A呢？？？

顶！

我是魔鬼

我觉得这道题的推倒结构等同于A only if （B+C)；既A—>（B+C)；所以A选项成立。

falcons

As I mentioned that if A require B, you can conclude A->B;

In the argument, you can extend the logic direction that if a theory is good, it must be both simple enough to contain a few elements while describe the observations accurately and predict the result definitely. Therefore A is right.

windfalls

I have to note a logic structure: A require B A->B;

good theory if it satisfies two requirements: should be Good theory->two requirements而不是two requirements->Good theory.

Therefore: A must be right