6. 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．
Situation Traffic into midtown has decreased by seven percent，and bus rider ship has increased by an equivalent amount．The mayor's publicity campaign is responsible for this change．
Reasoning What casts doubt on this conclusion? Another reasonable cause for the decrease in automobile traffic and the increase in bus rider ship would make this conclusion suspect．Road construction impeding access to midtown over the same period of time is a reasonable alternative explanation．The road construction projects would likely have caused fewer people to drive to midtown；many of these people have probably taken the bus．
A An increase in fares might be a reasonable explanation for decreased，rather than this increased，rider ship．
B The mayor’s decision to ride the bus sets a good example for citizens，and his example tends to strengthen the conclusion．
C Correct．This statement properly identifies an explanation that weakens the conclusion．
D An alternative explanation based on the running of more buses can be eliminated．
E Passengers perceive bus service to be the same，so better service can be eliminated as a possible cause of the increased rider ship．
这道题做倒是做对了 ，但是看解释，我的理解是E选项是以新规定颁布为时间分界，以前满意是乘客少，现在乘客多了，服务质量下降因而不满意，还是STRENGTHEN题干的。而OG给出的E的解释我不太理解啊
原题的结论是mayor’s对公车服务进行campaign（促使公车提高了其服务质量），从而导致乘客数增加
E说的是其实乘客们没觉得质量有提高，所以weaken了
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