p209 78题: 149 people were aboard Flight 222 when it arrived at LA from NY City with Chicago as the only intermediate stop. How many people first boarded the flight in Chicago? (1) 170 people were aboard the flight when it left NY City. (2) 23 people from the flight deplaned in Chicago and did not reboard. 答案:C 我觉得E,思路:NY原有A人,在Chicago上来F人,下去再也不回来D人,其它下去又上来R人,最终到达LA149人。即:A+F-D+R=149,让我求F (1) 告诉我A=170人 (2) 告诉我D=23人 但没有人告诉我R是多少人,因此我选E 讨论:R是不是必要存在,我觉得必要是因为题目黄色部分强调了F和D,因此派生出R。 实际:现实中转机下了又上,还是同一航班号的情况有吧!?  我是不是想多了 
[此贴子已经被作者于2008-9-8 22:12:12编辑过] |