急求一道GWD假设题解析，在线等，谢！

iamdurant · 发表于 2011-7-5 00:17:31

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.
答案是D,个人感到难以理解。如果以“取非消弱”的技巧来做这道假设题，那么D中去掉not的话，是如何削弱了原文呢？
望高手给出详解，感谢！！！

sdcar2010 · 发表于 2011-7-5 01:14:09

If you negate D, you have:
For the year following the tax increase, the pretax price of a pack of cigarettes was eight or more cents lower than it had been the previous year.
If this is the case, then the after-tax price of a pack of cigarettes with the tax hike does not change from that without the tax hike. Thus, the conclusion that "The volume of cigarette sales is therefore strongly related to the after-tax price of a pack of cigarettes" is wrong, because the after tax price correlates with two different sales numbers.

kevintoefl01 · 发表于 2011-7-10 21:05:01

谢谢，我也在纳闷呢！

DeliciaAn · 发表于 2015-6-20 20:09:49

顶下2lou

急求一道GWD假设题解析，在线等，谢！

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