逻辑鸡精 讨论 强烈要求置顶，方便逻辑讨论！！

glacier超

1.    1840年人们平均寿命60多，1870 年70多，所以对于老年人之类的病的医术先进了。。。问哪个消弱版本1  答案是1840年以后baby 死了少，（对平均年龄的副作用减少）
版本2：85.平均寿命延长的原因
V1 from tianyi0323
关于life span的变化，1940年的时候死的人平均60岁，1980年人死的时候平均78岁，同时医疗方面提高很大，于是认为应该是医疗进步导致的life span的增加。问Weaken。我选的是1980年死的人是死于和old有关疾病的。
版本3   V2
有道逻辑我选的和JJ给的答案不同,就是问美国60年寿命延长了,和医疗设备有关， 问削弱。我选的是45年开始很多infant的死亡率下降了。因为这是个新原因导致生命延长，因为延长不应该算在老人身上，而是算在这些小孩身上 。

鸡精里写第一题是这个，感觉好像og12里的第一题啊，是不是呢，求证明~
1. “Life expectancy” is the average age at death of the
entire live-born population. In the middle of the
nineteenth century, life expectancy in North America
was 40 years, whereas now it is nearly 80 years.
Thus, in those days, people must have been
considered old at an age that we now consider the
prime of life.
Which of the following, if true, undermines the
argument above?
(A) In the middle of the nineteenth century, the
population of North America was significantly
smaller than it is today.
(B) Most of the gains in life expectancy in the last
150 years have come from reductions in the
number of infants who die in their first year
of life.
(C) Many of the people who live to an advanced age
today do so only because of medical technology
that was unknown in the nineteenth century.
(D) The proportion of people who die in their
seventies is significantly smaller today than is the
proportion of people who die in their eighties.
(E) More people in the middle of the nineteenth
century engaged regularly in vigorous physical
activity than do so today.

glacier超

大家还有啥其他的逻辑鸡精讨论，希望都贴过来吧~~~

nowwsy

很类似诶~~
本月的答案挺靠谱儿的

glacier超

5.原来是上月的变种：一个国家卖的汽油有premiumoil，售价比其它的要贵，该国家使用premium oil的车型不超过10%，使用premium oil的车型一般用premium oil，不需要使用premium oil的车型如果用premium oil，对其性能没有任何的提高，但该国家premium oil的销量比例超过15%，说明人们浪费， 问消弱， 选了汽车拥旧了以后需要好汽油才能正常工作。

[考古]：
V1 from emily影瞳 740 说现在gasoline 的生产成本增加了，人们移向了柴油，但是gasoline 有了新的生产方法（出现了一个叫eth..的物质可以生产出），gasoline supplies增多了。 （按说柴油应降低）， 但是cost of 柴油反倒增高了，问为什么？我选的是柴油需要the byproduct of the gasoline process. 选项中还有：生产eth..的成本很expensive。
V2 from wmf 700+
汽油和柴油那个 也是狗的答案

GWD类似：
V1 from nicolekwok 770
Q17:GWD32-Q8
Last August the XT chain of gasoline stations had a temporary sales promotion in effect. In the promotion, any customer who made a purchase of ten or more gallons of gasoline was entitled to a free car wash. For the month of August, XT experienced a ten percent increase in gasoline sales as compared to sales in August the previous year, so evidently the promotion was successful as a means of boosting sales.
In evaluating the argument, it would be most helpful to answer which of the following?
A.    In the areas in which XT’s gasoline stations operate, how did total combined gasoline sales for all gasoline stations last August compare with sales for the previous August?
B.    Was the money that XT earned from the increase in gasoline sales enough to offset the cost of providing free car washes during the promotion? (profit 的比较)
C.    Were there any customers who bought ten or more gallons at an XT gasoline station during the promotion who would have or more gallons at an XT gasoline in lower quantities, but more frequently, if the promotion had not been in effect?
D.    Did XT or any of its gasoline stations have to pay other businesses to provide the car washes that customers were offered in the promotion?
Are XT’s gasoline sales in August usually significantly higher than one twelfth of XT’s annual gasoline sales?

Summereve

上面GWD答案是什么啊.A吗?

hukeab

上面GWD答案是什么啊.A吗?

-- by 会员 Summereve (2010/7/4 14:51:13)

是A，详见讨论帖http://forum.chasedream.com/GMAT_CR/thread-277522-1-1.html?SearchText=GWD32 Q8
但是我总觉得C也蛮对的····好像做过一个超市的类似题目就是选C的

jackraywen

C不正确的原因在于，人们采取每次多加油的策略仍旧是promotion的效果。这题应该选一个衡量是不是其他原因，比如A选项中的，上个季度整个地区的销量都比较高。

hukeab

C不正确的原因在于，人们采取每次多加油的策略仍旧是promotion的效果。这题应该选一个衡量是不是其他原因，比如A选项中的，上个季度整个地区的销量都比较高。

-- by 会员 jackraywen (2010/7/4 15:45:29)

多谢~