最后两道问题，陈向东逻辑。青椒~

问问题以前请教一下 什么是通货膨胀？它的定义是什么？不好意思我学工程的没学过经济~`

我的理解是不是原来1分钱买一袋大米，通货膨胀的后1分钱买0.5袋大米？ 好像和纸币金属币有关系但不是很清楚，请教大家了~~

page274 第67

All actors are exuberant people and all exuberant people are extroverts, but nevertheless it is true that some shy people are actors.

If the statements above are true, each of the following must also be true EXCEPT:

(A) Some shy people are extroverts.

(B) Some shy extroverts are not actors.

(C) Some exuberant people who are actors are shy.

(D) All people who are not extroverts are not actors.（B）

(E) Some extroverts are shy.

B和D都推不出来啊~ 为什么d 对了？b不对呢？

page274 第68  

Unless negotiations begin soon, the cease-fire will be violated by one of the two sides to the dispute. Negotiations will be held only if other countries have pressured the two sides to negotiate; an agreement will emerge only if other countries continue such pressure throughout the negotiations. But no negotiations will be held until international troops enforcing the cease-fire have demonstrated their ability to counter any aggression from either side, thus suppressing a major incentive for the two sides to resume fighting.

If the statements above are true, and if negotiations between the two sides do begin soon, at the time those negotiations begin each of the following must also be true EXCEPT:

(A) The cease-fire has not been violated by either of the two sides.

(B) International troops enforcing the cease-fire have demonstrated that they can counter aggression from either of the two sides.

(C) A major incentive for the two sides to resume hostilities has been suppressed.

(D) Other countries have exerted pressure on the two sides to the dispute.（A）

(E) The negotiations’ reaching an agreement depends in part on the actions of other countries.

d 也不一定正确阿？谁能帮我看看为什么d对了？

p274-67:原则：A->B可以推出 非B->非A，但是不能推出 B-〉A

题目：A actor -〉B exuberant -〉C extrovert，so A -〉C

选项B：不能推出C-〉A，所以 不能C的一部分（shy extrovert）-〉A

选项D：非C->非A

p274-68: 原则：page18,line6,line7. 注意！！！：这本书的P13-P18的内容一定要熟记。

这一题的第一句话，unless B(negotiation begin),A(violate ceasefire), 可以推出 非A （not violate）-〉B（negotiation begin），非B（negotiation not begin） -〉A(violate ceasefire)。

非B -〉A 不能推出 B-〉非A。本题的前提是，B（negotiate begin），选项A是 B-〉非A（not violate）。但是非B -〉A 不能推出 B-〉非A。所以选项A是唯一的不must的。

这2题是很好的训练if和unless题型的。记住结论，很有用处。

请指正。

p274-67

p274-68  A 对的我承认 ，但我觉得d也推不出来，除非international troops enforcing the cease-fire have demonstrated their ability to counter any aggression from either side, thus suppressing 。。。  里的international troops 指的就是 other countries

是吗？

麻集爱：这种题目你不要去从语句分析，你要首先抽象。我们的中文的大脑是没法想明白故意绕美国人的美语的。但单个的概念是我们分析的强项。

文中的一句话：Negotiations will be held only if other countries have pressured the two sides to negotiate。

other countries have pressured the two sides to negotiate（B）是Negotiations will be held （A）的必要条件。

A是B的充分条件，A-〉B；同样，B是A的必要条件，也有A-〉B。所以题目已经告诉你A-〉B，而前提是（A）Negotiations will be held （我想没有人可以证明do begin soon不是will be held吧），所以（B）成立。正是选项D。

你一定要把单个的概念和他们之间的关系抽象出来，这样if和unless的题目就变成了我们的快速送分题。（注意！！！：这本书的P13-P18的内容一定要熟记。）就像几何题必须记住定理，我们没时间也没必要去推导定理，也不一定能推出来。

发现偶真笨~

非常感谢 ~

别太谦虚了。找些大牛mindfree的帖子看看，我也是一开始摸不着北，看了他的几个帖子，确实很有启发。