以下是引用lawyer_1在2004-11-4 11:33:00的发言：以后给答案和分析 24. No mathematical proposition can be proven true by observation. It follows that it is impossible to know any mathematical proposition to be true. The conclusion follows logically if which one of the following is assumed? (A) Only propositions that can be proven true can be known to be true (B) Observation alone cannot be used to prove the truth of any proposition (C) If a proposition can be proven true by observation then it can be known to be true. (D) Knowing a proposition to be true is impossible only if it cannot be proved true by observation (E) Knowing a proposition to be true requires proving it true by observation 个人的一点看法： 其实就按paopao的说法此题也是可以解的 none proposition can be proved by observation。就推得（follows），know any propostion is impossible. 即：observation－－》can not prove proposition。接下来就依次推得一个结论，knouwing a proposition －－－》impossible 只要将所有得knowing proposition的方式都限定在observation，上述推理就成立了 E就是这样一个限定。 | 
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发表于 2006-2-22 22:26:00
