向NN请教一道逻辑题~~~~

xyxyxy_123 · 发表于 2016-3-23 11:43:07

A thorough search of Edgar Allan Poe's correspon-
dence has turned up not a single letter in which he
mentions his reputed morphine addiction. On the basis
of this evidence it is safe to say that Poe's reputation
for having been a morphine addict is undeserved and
that reports of his supposed addiction are untrue.
Which of the following is assumed by the argument
above?
(A) Reports claiming that Poe was addicted to mor-
phine did not begin to circulate until after his
death.
(B) None of the reports of Poe's supposed morphine
addiction can be traced to individuals who actu-
ally knew Poe.
(C) Poe's income from writing would not have been
sufficient to support a morphine addiction.
(D) Poe would have been unable to carry on an
extensive correspondence while under the
influence of morphine.
(E) Fear of the consequences would not have pre-
vented Poe from indicating in his correspon-
dence that he was addicted to morphine. 答案是E，但是为什么不选D呢？

xyxyxy_123 · 发表于 2016-3-23 11:43:47

xyxyxy_123 · 发表于 2016-3-23 16:00:08

raykee · 发表于 2016-3-23 17:47:36

D seems to weaken the argument.

xyxyxy_123 · 发表于 2016-3-23 20:43:52

raykee 发表于 2016-3-23 17:47
D seems to weaken the argument.

D为什么是削弱呢？能否详细讲解下？谢谢~~

emmahiggins09 · 发表于 2016-3-24 07:06:50

Premise: 在EA给笔友的信件中没有找到关于吗啡上瘾的描述
conclusion: 所以吗啡上瘾这件事情是不真实的

问题问的是前提: which of the following is assumed by the argument above.
做法就是将选项取非使conclusion 不成立

E取非后得到：fear of the consequences would have prevented Poe from indicating in his correspondance that he was addicted to morphine
由此可以推出即使没有找到在书信中对吗啡上瘾的描述，也不能说Poe 同学就没有吗啡上瘾，所以使结论不成立。

D取非后得到：Poe would have been able to carry on an extensive correspondence while under the influence of morphine. 得到的结果貌似是对结论的肯定和支持。

个人浅见，欢迎指正

xyxyxy_123 · 发表于 2016-3-25 21:08:02

emmahiggins09 发表于 2016-3-24 07:06
Premise: 在EA给笔友的信件中没有找到关于吗啡上瘾的描述
conclusion: 所以吗啡上瘾这件事情是不真实的

同意！

xyxyxy_123 · 发表于 2016-3-27 00:13:41

One state adds a 7 percent sales tax to the price of most products purchased within its jurisdiction. This tax, therefore, if viewed as tax on income, has the reverse effect of the federal income tax: the lower the income, the higher the annual percentage rate at which the income is taxed.
The conclusion above would be properly drawn if which of the following were assumed as a premise?
(A) The amount of money citizens spend on products subject to the state tax tends to be equal across income levels.
(B) The federal income tax favors citizens with high incomes, whereas the state sales tax favors citizens with low incomes.
(C) Citizens with low annual incomes can afford to pay a relatively higher percentage of their incomes in state sales tax, since their federal income tax is relatively low.
(D) The lower a state's sales tax, the more it will tend to redistribute income from the more affluent citizens to the rest of society.
(E) Citizens who fail to earn federally taxable income are also exempt from the state sales tax.还有这道为什么选的是A呢？

向NN请教一道逻辑题~~~~

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