求救一道狒狒逻辑题 feifei-5，我看不出为何错误

willhsu829

(feifei-5/135)
Sales manager: Last year the total number of meals sold in our company restaurants was much higher than it was the year before. Obviously consumers find our meals desirable.
Accountant: If you look at individual restaurants, however, you find that the number of meals sold actually decreased substantially at every one of our restaurants that was in operation both last year and the year before. The desirability of our meals to consumers has clearly decreased, given that this group of restaurants---the only ones for which we have sales figures that permit a comparison between last year and the year before---demonstrates a trend toward fewer sales.


5. If the sales figures cited by the accountant and the sales manager are both accurate, which one of the following must be true?
(A) The company opened at least one new restaurant in the last two years.
(B) The company’s meals are less competitive than they once were.
(C) The quality of the company’s meals has not improved over the last two years.
(D) The prices of the company’s meals have changed over the past two years.
(E) The market share captured by the company’s restaurants fell last year.

答案:A
这道题我选了大家排除掉的B, 因为Accountant 说"you find that the number of meals sold actually decreased substantially at every one of our restaurants that was in operation both last year and the year before. ", 不就暗示了B所说的 -- 现在生意相较於以前是比较不好的-- 吗？

willhsu829

原来如此！！
must be true类型的题目在这题中，两个观点需都要顾到
感谢你的解答~

fdunan

正因为两者都正确，所以不可能B了。B只能从Accountant推出来，不能从Sales manager的陈述里面推出来。引入新的结论不能和现有的结论矛盾。

willhsu829

可是题目说了:
5. If the sales figures cited by the accountant and the sales managerare both accurate, which one of the following must be true?

题目先说到两者都正确，考must be true

B看起来挺好的啊



还是不明白，要麻烦你多解释几句

fdunan

B项和Acountant一致，但和Sales manager矛盾。Sales manager说total number of meals sold in our company restaurants was much higher than it was the year before，所以按照sales manager的说法应该是more competitive了。