feifei逻辑宝典 29题

The price of a full-fare coach ticket from Toronto to Dallas on Breezeway Airlines is the same today as it was a year ago, if inflation is taken into account by calculating prices in constant dollars. However, today 90 percent of the Toronto-to-Dallas coach tickets that Breezeway sells are discount tickets and only 10 percent are full-fare tickets, whereas a year ago half were discount tickets and half were full-fare tickets. Therefore, on average, people pay less today in constant dollars for a Breezeway Toronto-to-Dallas coach ticket than they did a year ago.

Which one of the following, if assumed, would allow the conclusion above to be properly drawn?

(A) A Toronto-to-Dallas full-fare coach ticket on Breezeway Airlines provides ticket-holders with a lower level of service today than such a ticket provided a year ago.

(B) A Toronto-to-Dallas discount coach ticket on Breezeway Airlines costs about the same in constant dollars as they did a year ago.

(C) All full-fare coach tickets on Breezeway Airlines cost the same in constant dollars as they did a year ago.

(D) The average number of coach passengers per flight that Breezeway Airlines carries from Toronto to Dallas today is higher than the average number per flight a year ago.

(E) The criteria that Breezeway Airlines uses for permitting passengers to buy discount coach tickets on the Toronto-to-Dallas route are different today than they were a year ago.

答案选B

本题所讲的，无非就是，people pay less today in constant dollars，而得出这个结论的证据是，以前10%有打折，现在一半有打折，那么，这个前提就是，他们的价格是一样的，不然，如果涨价，就不可能付的少了

A，service，无关

C，full-fare coach tickets cost the same 不等于打折后的也一样

D，无关

E，无关

解释也没看懂，觉得没有正确答案呵。如果选B，岂不和结论“pay less”矛盾了么？菜鸟有求各位大虾了*

举个例子,用不变货币衡量,原来和现在都是100美圆,原来50%的人能享受折扣,现在90%的人享受折扣.可是折扣是多少呢?也许过去都是1折,现在都是9折,那么平均来讲消费者交的钱就更多了.而正确答案排除了这种可能,就是说过去和现在都是打同样的折扣,比如5折,那么过去只有10%的人享受折扣,现在50%的人享受,平均价格自然低了.