og-41

41. 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 routes 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. C

这道题要反驳的结论是：人们不开车而坐公交车去midtown的原因不是市长的campain引起的，c答案说明了另一个理由所以是对的，但是,我不明白的地方是，og的分析说，答案a是对原结论的支持？？车票涨价按理说人们不就不坐公交车了吗？我不懂是怎末个支持法，脑子实在转不过来，呵呵，不知谁能帮我解释一下，先谢了!