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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.
Which of the following, if true, would most strengthen the argument above?
(A) During the second year after the tax increase, cigarette sales increased by a significant amount.
(B) The information available to consumers on the health risks of smoking remained largely unchanged in the period before and after the tax increase.
(C) Most consumers were unaware that the tax on cigarettes was going to increase.
(D) During the year following the cigarette tax increase, many consumers had less income, in inflation-adjusted dollars, than they had had in the previous year.
(E) During the year after the tax increase, there was a greater variety of cigarettes on the market than there had been during the previous year.
香烟税提高后香烟销量减少-->香烟销量和香烟售价有关,
更清楚一点说,香烟税提高后香烟销量减少-->香烟税的提高导致了香烟销量减少。
事件B在事件A之后发生,就一定是A导致B吗?并不一定。
这题选B,排除他因,排除了销量减少是因为“消费者得到更多关于吸烟有害健康的信息”这个可能的原因。 |
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