逻辑十套 Ex4.10

lehr1937UID: 3395946

10. Census data for Prenland show that unmarried
Prenlandic men in their thirties outnumber unmarried
Prenlandic women in that age group by about ten to
One. Most of these men do wish to marry. Clearly,
however, unless many of them marry women who
are not Prenlandic, all but a minority will remain
unmarried.
The argument makes which of the following assump-
tions?
(A) Emigration from Preland is more common
among women than among men.
(B) A greater proportion of Prelandic women
in their thirties than of Prenlandic men of the
same age would prefer to remain unmarried.
(C) It is unlikely that many of these unmarried
Prenlandic men will marry women more than
a few years older than themselves.
(D) Prenland has a high rate of divorce.
(E) Most of the unmarried Prenlandic men are
unwilling to marry women who are not

lehr1937UID: 3395946

答案是C  我选的是E  - -

dancinglightUID: 3432972

1, core argument: unless P men marry none P women, most of them will remain single.
All but a few的意思是 all except a few, 即＂除了几个外都＂
2, Logic chain: Unmarried P men more than unmarried P women from the same age group -> core argument

Logic flaw/ unstated assumption是 the only P women that P men shall marry should be of P men's same age group.

Assumption的特征是没有它结论不能成立。(untenable)

而E: most P men would not marry none-P women 不成立的情况下结论中情况仍然可以实现：P men 和 none-P women结婚并不影响结论的成立。

但C不成立的话结论就没法保证了，因为 unstated assumption unwarranted.

crazyrobinUID: 2368627

楼上的解释基本可以
教你一个验证Assumption question的方法
negate 答案选项，也就是对某个答案取非
于是C变成了
It is likely that
这个Argument一下被毁掉了，这就是正确答案。
Negate后可以毁掉argument的assumption就是正确答案

lehr1937UID: 3395946

dancinglight 发表于 2013-6-4 09:15
1, core argument: unless P men marry none P women, most of them will remain single.
All but a few的 ...

明白了 多谢

lehr1937UID: 3395946

crazyrobin 发表于 2013-6-4 09:36
楼上的解释基本可以
教你一个验证Assumption question的方法
negate 答案选项，也就是对某个答案取非

多谢版主

dancinglightUID: 3432972

crazyrobin 发表于 2013-6-4 09:36
楼上的解释基本可以
教你一个验证Assumption question的方法
negate 答案选项，也就是对某个答案取非

谢谢robin哥指教~