大全-3-5讨论

大全-3-5. A weapons-smuggling incident recently took place in country Y. We all know that Y is a closed society. So Y’s government must have known about the weapons.
Which of the following is an assumption that would make the conclusion above logically correct?
(A) If a government knows about a particular weapons-smuggling incident, it must have intended to use the weapons for its own purposes.
(B) If a government claims that it knew nothing about a particular weapons-smuggling incident, it must have known everything about it.
(C) If a government does not permit weapons to enter a country, it is a closed society.
(D) If a country is a closed society, its government has a large contingent of armed guards patrolling its borders.
(E) If a country is a closed society, its government has knowledge about everything that occurs in the country.

答案是E

可是我觉得思路有问题。用经典的取非来做，E取非为government不一定知道所有的发生在这个国家的事情。那么假如他知道所有关于weapon的事，但其他的事则不是全知道呢？这样取非，原文推论照样成立。

你看看我说的情况。我指的是那个国家只需要知道所有关于weapon的事must就成立，并不需要知道所有的事。既然不需要，那么“知道所有的事”就不能作为assumption了