[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

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.

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。

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！

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！

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