[求助]费费逻辑97

xiaoyuexiao

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

chouliulu

就算predictions about the results of future observations是必要条件， 但不一定是made by any good scientific theory。虽然B也推不出  但A也不对吧!!

kevin_8p

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！

weifanmm

up.此题A还是不对。如果A->(B+C),怎么能说B只来自于A呢？？？

 

再顶！

乱草花儿

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。

vincentwh

QUOTE:

 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

红字的部分我觉得不太对8，我认为原句的意思，two requirements是充要条件。请指正。

DARRENMA

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

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.

insonbia83

和搂主一样,怎么也想不明白。看了2楼的兄弟的解释,还是不明白,能否再讲解的详细些?拜托拜托

berylgirls

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