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标题: [求助]费费逻辑97 [打印本页]

作者: xiaoyuexiao 时间: 2009-8-2 16:55 标题: [求助]费费逻辑97

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

作者: berylgirls 时间: 2009-8-3 06:40

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

作者: insonbia83 时间: 2009-8-4 06:45

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

作者: DARRENMA 时间: 2009-8-5 06:39

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

ffice" />

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.

作者: vincentwh 时间: 2009-8-6 06:33

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。

作者: 乱草花儿 时间: 2009-8-7 20:23

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。

作者: weifanmm 时间: 2009-8-8 09:13

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！

作者: kevin_8p 时间: 2009-8-9 06:31

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！

作者: chouliulu 时间: 2009-8-11 06:37

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!!

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