cician 发表于 2013-11-16 18:22
谢谢回复,疑问如下
Doesn't choice C also eliminate a potential cause to the effect that cigarette ...
739659010 发表于 2016-4-22 01:16
文章需要加强的结论是销量和税后价格的关系,也就是税后价低销量高,反之亦然。
加税之前,香烟下降1%,销 ...
irenetopia 发表于 2013-11-16 18:49
这么想
问题问的是销售量的上升和烟税价格密切相关
问加强
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