继续请教（5）

liflyy

12。there are fundamentally two possible changes in an economy that will each cause inflation unless other compensating changes aslo occur. there changes are either reductions in the supply of goods and services or increases in demand. in a prebanking economy the quantity of money available, and hence the level of demand, is equivalent to the quantity of gold available.
Q: --also true in a prebanking economy.
A: (a) if other factors in the economy are unchanged, increasing the quantity of gold available will lead to inflation.
   (b) if there is a reduction in the quantity of gold available, then, other things being equal, inflation must result.
why a not b

13. after graduating form high school, people rarely multiply frations or discuss ancient rome, but they are confronted daily with decisions relating to home economics. yet mathematics and history are required courses in the high school curriculum, home economies is only an elective, and few students choose to take it.
A: if it is important to teach high school students subjects that relate to decisions that will confront them in their daily lives, then home economics should be made an important part of the high school curriculum.

如何推出来的呢？

14。all actors are exuberant people and all exuberant people are extroverts, but nevertheless it is true that some shy people are actors.
Q: true except---
Aa) 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
  (e) some extroverts are shy

怎样推导？

liflyy

我发的帖子为什么没人回复，555

jacy

请贴出题目来源，并在题目中指明，这样不仅方便后来人寻找帖子，而且万一题目写错了，也好方便其他考友回去查书。
另外，如果方便请写出你的作题思路，这样更方便NN们对症开药，指出你的问题。
一点建议。
呵呵，不过我不是NN，还是请其他NN来答这些题吧。