逻辑机经求讨论。。。都是最棘手的哟。。找牛人分析了一下答案，但是还有疑问，恳请CDer各抒己见。附逻辑39原题。。。

hellocrystal

1、医生诊断问题，如果本来没病被诊断出有病叫positive false, 如果本来有病被诊断没病叫negative false,而positive false的几率1000个disease free的中只有10个人被误诊，所以医生就觉得啦，概率那么小，这些个误诊就不重要啦~，weaken

逻辑链：PF的概率小-------误诊不重要


医生诊断问题，如果本来没病被诊断出有病叫positive false, 如果本来有病被诊断没病叫negative false,而positive false的几率1000个disease free的中只有10个人被误诊，所以医生就觉得啦，概率那么小，这些个误诊就不重要啦~，weaken

逻辑链：PF的概率小-------误诊不重要

Weaken：NF的概率不一定小啊，而且NF比PF要严重耶！



这个题我一个同学说做过。好像应该是positive FALSE的概率在误诊的数量中占得比例很大。

我对这个题毫无思路啊，但是貌似真有道GWD题是这个。。。但是我没有找到。。。。

求大家指点思路啊。。。。。。
2、.Archaeologist: It is widely accepted that the native Americans were migrated from Asia some 12,000 years ago. However, DNA study of native American tribes show that it takes 26,000 years for the DNA to mutate from Asian type to American type. Thus Asians must have moved to America much earlier than previously estimated.[V1]

Question: What is the assumption made?

1) The Americans are indeed migrated from Asia.

2) The DNA types of Asians today are the same with the past.

逻辑链：DNA从Asian转到American要26000年-----所以Asian不是12000以前过去的，而是更早

Assumption：这个题我那个大牛同学说选A。。。我也比较偏向选A。。。。排除他因。。。大家有木有异议的？？？



3、航空公司打扫飞机卫生没有以前频繁了，因为要节约成本，但是B公司不同，打扫得还是很勤快，解释一下为什么B公司跟别的公司做法不同？

逻辑链：fact1，为了节约成本有的公司就不打扫卫生了 fact2 B公司打扫卫生很勤快

解释：1.乘客很多（应该意思是乘客多收入高，成本不是问题吧），有人（700+）说确定是这个

1.航空公司有一种激励机制可以使员工在工作间隙高效打扫（700）



这个题你选啥？？？1

这题大家觉得应该选啥？？？




逻辑39题原题：

In recent years, networks of fiber-optic cable have been replacing electrical wire for transmitting telecommunications signals. Signals running through fiber-optic cables deteriorate, and so the signals must be run through a piece of equipment called a regenerator before being transmitted farther. Light-Line is the leading manufacturer of signal regenerators. Therefore, Light-line is one of the companies that will most benefit if new long-distance fiber-optic telecommunications networks are constructed.

Which of the following, if true, casts the most doubt on the prediction about light-line’s prospects?

A.Telecommunications signals sent along electrical wires can travel much farther than signals transmitted through fiber-optic before needing to be regenerated.

B.Expanding its production of regenerators will require Light-Line to spend proportionately more on labor and materials.

C.The volume of signals that a fiber-optic cable can carry is several thousand times greater than the volume that can be carried by an electrical wire of similar size.

D.There are technologies that enable telecommunications signals to be transmitted without either wire or fiber-optic cable.

E.Several manufacturers are developing regenerator technologies that will allow signals to be transmitted many times farther than at present before requiring regeneration.

酱子啊

第一题 不懂~~
第二，同意、
第三，倾向于选A，前者
39，没问题 啊~~

12604698

1 概率小，基数大，总数也多啊。也可能那个几率小的更致命之类怎么不好。
2 有没有其它选项，我觉得a不咋靠谱啊，这个请大牛来吧~我搬个板凳听。
3从打算不怎么花成本或者打算获得的收获比付出的多入手吧。
但是一定要突出b的特别。没有b和其他航空公司比较一定错。

哎，每到逻辑在题库里有不止一个正确答案和好多错误答案的。随机出现的

xiaxiaqin

等牛牛解答

千与千寻117

In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.



Which of the following, if true, gives the most support to the recommendation above?



(A)       The accepted treatment for pironoma does not have damaging side effects.



(B)       The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma.



(C)      In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.



(D)      The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma.



All laboratory tests to detect pironoma have the same proportion of false negative results.

酱子啊

Talen16

In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.

Which of the following, if true, gives the most support to the recommendation above?
(A)       The accepted treatment for pironoma does not have damaging side effects.
(B)       The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma.
(C)      In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.
(D)      The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma.
（E） All laboratory tests to detect pironoma have the same proportion of false negative results.

-- by 会员 千与千寻117 (2011/12/13 20:46:48)

咋感觉木有对的呢，伤不起啊……

Talen16

选E吧，其实感觉E+C最好。

小耳蛇蛇

顶上去吧·

guotonghao123

选E吧