Q4:

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?

1. 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.

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

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

4. 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.

5. As the after-tax price of a pack of cigarettes rises, the pretax price also rises.

WHY CHOOSE D

confusing about A and D  

D是对的.

文章大概在说加tax了,烟的sales下降了. D说: 加税后,每包烟的税前价不比没加税时要低8分钱或更少.就是说加税后烟价也要增加.从而match文章说的sales下降.

A说的反了.A想说加税后烟价不一定增加.

个人看法.