嘻嘻, tianwan gg, 偶的怨气把你给吵啦?抱歉!下面是选项:
(a) as the price of gasoline rises, the number of riders using public transportation rises
(b) even if the price of gasoline rises, the number of riders using public transportation will continue to decline
(c) if the price of gasoline rises to a prohibitive level, the number of riders using public transportation will rise.
(d) The majority of riders using public transportation do not use gasoline; hence fluctuations in gasoline prices are unlikely to affect the number of riders using public transportation
(e) The price of gasoline is always low enough to make private transportation cheaper than public transportation. Hence , fluctuations in gasoline prices are unlikely to affect the number of riders using public transportation
其实就是这道题的出现,偶对条件的判断很混淆了,也就给gg发了个短训,讨教了一些问题嘛。
陈向东(CXD)的解释为A1 delays and breakdowns ; A2 cuts in services; A3 fares higher… A4 gasoline not prohibitive; B the number of passengers has fallen 。4个A分别是必要条件
他的推倒是B=>A4, 逆否命题是~A4=>~B, 所以正确答案是C
但是偶觉得是 A1A2A3A4=>B, 所以~B=>~A1+~A2+~A3+~A4, 找不到一个这样的答案,而且一个很严重的问题:偶的理解,就变成B是必要条件,这正好和CXD反着干,没有好结果啊,错了?
等gg赐教,谢谢!
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