GWD CR求解牛牛乱入

shammy17 · 发表于 2010-7-17 22:45:39

In the years following an eight-cent increase in the federal tax on a pack of cigarettes, sales of cigarettes fell ten percent. In contrast, in the year prior to the tax increase, sales had fallen one percent. The volume of cigarette sales is therefore strongly related to the after-tax price of a pack of cigarettes.

The argument above requires which of the following assumptions?

A.During the year following the tax increase, the pretax price of a pack of cigarettes did not increase by as much as it had during the year prior to the tax increase.

B.The one percent fall in cigarette sales in the year prior to tax increases was due to a smaller tax increase.

C.The pretax price of a pack of cigarettes gradually decreased throughout the year before and the year after the tax increase.

D.For the year following the tax increase, the pretax price of a pack of cigarettes was not eight or more cents lower than it had been the previous year.

E.As the after-tax price of a pack of cigarettes rises, the pretax price also rises.
这道CR灰常地疑惑把推理思路整理出来还是不对劲感觉答案有点牵强可能还是理解不到位吧请大牛指点江山

x_fan · 发表于 2010-7-17 23:13:44

读完题目，形成逻辑：
加了税sales就变了好多--〉税跟sales高度相关

假设题，正确选项应加强“加了税sales就变了好多”（很可能是排除其他导致sales变化原因）

看选项
A 和加tax前一年有什么关系？推理是在加税当年
B 和前一年无关
C 和前一年后一年都无关
D 说税前价格没有巨大变化，排除了sales的变化是非税因素造成的
E 无关于加税的问题

所以就是D阿

shammy17 · 发表于 2010-7-19 10:45:44

get it 同学逻辑思路灰常清晰致敬

shammy17 · 发表于 2010-7-19 10:47:08

再问一道CR
The cause of the wreck of the ship Edmund Fitzgeraid in a severe storm on lake Superior is still unknown , when the sunken wreckage of the vessel was found, searchers discovered the hull in two pieces lying close together, The storm’s violent waves would have caused separate pieces floating even briefly on the surface to drift apart. Therefore, the breakup of the null can be ruled out as the cause of the sinking.
Which of the following is an assumption on which the argument depends?
A.   Ships as large as the Edmund Fitzgerald rarely sink except in the most violent weather.
B.   Under water currents at the time of the storm did not move the separated pieces of the hull together again.
C.

ieces of the hull would have sunk more quickly than the intact hull would have
D. The waves of the storm were not violent enough to have caused the breakup
E. If the ship broke up before sinking , the pieces of the hull would not have remained on the surface for very long

是不是这样理解的题目的结论是hull分开了不是船沉的原因因为发现沉下去的船的hull是在一起的 B答案取非是船沉下去以后waves又把分开的hull搞到一起了船在沉下去以前hull就断了所以会沉 B答案把这个可能排除掉了

x_fan · 发表于 2010-7-20 10:01:03

文章那么长，其实就看therefore之后就够了，即
not the breakup --> sinking
看多了自己晕反而会被干扰项迷惑

假设题，正确选项方向就是要说“breakup确实没用”，然后你就看看哪个选项离 breakup没用最近，排除其他离得远的就做出来了

A:船除了...时很少沉，离breakup太远了，无关
B:暗流没有移动碎片让他们重新组合，是不是跟breakup的作用很有关系阿，可能是答案，放着
C:碎片比什么下沉的快，跟breakup无关
D:波浪不足以导致breakup，跟breakup-->sinking的问题无关阿
E:若在sinking前brekaup，碎片不会在水表面呆很久，在水面呆的时间breakup很远啊，无关

所以，最后果断选B，时刻记得考场上更多是感觉，没有时间乱想~能把题目和选项都读明白时间就差不多了~

shammy17 · 发表于 2010-7-20 11:25:14

果然是NN 膜拜
可能对无关选项的感觉练得还不到家总有些题用无关排除不了
而且我做题的时候思路没这么清晰要想好久
可以传授一下做CR的方法吗
有没有必要对每个题型进行总结
如何总结谢谢

x_fan · 发表于 2010-7-20 12:35:42

http://forum.chasedream.com/GMAT_Preparation/thread-440656-1-1.html?SearchText=

http://forum.chasedream.com/GMAT_Preparation/thread-444732-1-1.html?SearchText=

可以看看这两个帖子
体会一下思路

GWD CR求解牛牛乱入

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GWD CR求解 牛牛乱入

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GWD CR求解牛牛乱入