Since the mayor’s publicity campaign for Greenville's bus service began six months ago,morning automobile traffic into the midtown area of the city has decreased seven percent. During the same period,there has been an equivalent rise in the number of persons riding buses into the midtown area.Obviously, the mayor's publicity campaign has convinced many people to leave their cars at home and ride the bus to work.
Which of the following,if true,casts the most serious doubt on the conclusion drawn above?
(A) Fares for all bus mutes in Greenville have risen an average of five percent during the past six months. (B) The mayor of Greenville rides the bus to City Hall in the city's midtown area. (C) Road reconstruction has greatly reduced the number of lanes available to commuters in major streets leading to the midtown area during the past six months. (D) The number of buses entering the midtown area of Greenville during the morning hours is exactly the same now as it was one year ago. (E) Surveys show that longtime bus riders are no more satisfied with the Greenville bus service than they were before the mayor’s publicity campaign began.
个人觉得题目是要求找weaken conclusion的,A选项车费贵了,那么bus应该减少啊,不是跟结论相悖吗?!B选项是strengthen conclusion;C选项道路重修,car减少了,但为什么bus会增多啊? D、E选项的排除也不是很明白 乞求详解~~万分感谢 |