The price of a full-fare flight ticket from Beijing to Shanghai on Air China is the same today as it was a year ago, if inflation is taken into account by calculating prices in constant RMB. However, today 80% of the Beijing-to-Shanghai flight tickets that Air China sells are discount flight tickets and only 20% are full-fare flight tickets, whereas a year ago half were discount flight tickets and half were full-fare flight tickets. Therefore on average, people pay less today in constant dollars for an Air China Beijing-Shanghai flight 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 Beijing-to-Shanghai full fare flight ticket on Air China provides ticket-holders with a lower level of service today than such a ticket provided a year ago.
B) The average number of coach passengers per flight that Air China carries from Beijing to Shanghai today is higher than the average number per flight a year ago.
C) All full fare flight tickets on Air China cost the same in constant dollar RMB as they did a year ago.
D) A Beijing-to-Shanghai discount flight ticket on Air China costs about the same amount in constant dollars today as it did a year ago.
E) The criteria that Air China uses for permitting passengers to buy discount flight tickets on the Beijing-to-Shanghai route are different today than they were a year ago 作者: EvaCheng 时间: 2012-10-18 21:30
(C) actually is simply repeating what the stimulus says in the first sentence.
(D), as you just said, is a necessary assumption. If today's discount is only 1% off the full fare while the discount last year was 99% off the full fare, the conclusion would be totally wrong.
A1 (D), as you just said, is a necessary assumption. If today's discount is only 1% off the full fare while the discount last year was 99% off the full fare, the conclusion would be totally wrong.
我想的有点不同，选项里的意思应该是去年和今年的打折机票是一个价。而不是说今年的折扣和去年的折扣量是一样的。前提和结论之间的GAP应该是RMB和DOLLARS，第一句话已经说了用RMB衡量的价格一样，结论要美元，那应该是要求汇率稳定，至少美元买的机票价钱没变。不过你说的折扣量似乎也很重要。作者: bontakuner 时间: 2012-10-19 06:17
Oops, the dollar should be changed to RMB. My bad. Considering the existence of the typo, you DO have point to eliminate C according to the difference between RMB and dollar.
I will change the answer C right away.作者: felixroman 时间: 2012-10-20 06:17
dear sdcar2010, as you said, one of the prompts for sufficient assumptions is: the author's conclusion would be properly drawn if which one of the following was true? i believe this sentence is similar with the question above:Which one of the following, if assumed, would allow the conclusion above to be properly drawn?
so, why the correct answer we are looking for should be a necessary assumption but not a sufficient one? because the text has already given another necessary assumption:The price of a full-fare flight ticket from Beijing to Shanghai on Air China is the same today as it was a year ago, and the combination of (D) and this one is both sufficient and necessary for the conclusion?作者: bontakuner 时间: 2012-10-22 06:36
Good catch. D) in fact, is not a necessary assumption, but a sufficient one. A necessary condition would be: Last year'd discount price was not drastically lower than that of this year.作者: matchMichelle 时间: 2012-10-25 21:39
A) A Beijing-to-Shanghai full fare flight ticket on Air China provides ticket-holders with a lower level of service today than such a ticket provided a year ago. -------------- not mentioned
B) The average number of coach passengers per flight that Air China carries from Beijing to Shanghai today is higher than the average number per flight a year ago. ---------------- irrelevant
C) All full fare flight tickets on Air China cost the same in constant dollar RMB as they did a year ago.
-------------- constant cost, correct， 我错了，范围太大
D) A Beijing-to-Shanghai discount flight ticket on Air China costs about the same amount in constant dollars today as it did a year ago. ----------------- don’t know the origin cost 这个是正确答案
E) The criteria that Air China uses for permitting passengers to buy discount flight tickets on the Beijing-to-Shanghai route are different today than they were a year ago -------------- irrelevant作者: cher6068 时间: 2012-12-20 06:43
xx
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