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In the year 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 following assumptions?
ADuring 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.
BThe one percent fall in cigarette sales in the year prior to tax increase was due to a smaller tax increase.
CThe pretax price of a pack of cigarettes gradually decreased throughout the year before and the year after the tax increase.
DFor 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.
EAs the after-tax price of a pack of cigarettes rises, the pretax price also rises.
GWD题，答案为D
[提问]: 我觉得这道题明明A，D都能说通。
假设无非是要排除“可能是税前价太高导致的销量下降”！，这样才能论证是税后价的影响。
A：年1，销量下降1%，
年2， 加税，销量下降10%。
年1的销售下降应该是由于税前价上涨带来的，那么如果年二2税前价涨幅与年1一样甚至更低的话，就可以证明这么大的销售滑坡一定是加税带来的了。
这就是A选项的意思。
请问我这么理解哪里不对？
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发表于 2014-5-7 21:04:49
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