[单选,材料题] thought

回答下面的题目：
Traffic in Uur Cities
Tile volume of traffic in many cities in the world today continuesto expand．This causes many problems，including serious air pollution，lengthydelays，and the greater risk (51)accidents．Clearly，something must be done，but it is often difficult to persuade people to (52)theirhabits and leave their cars at home．
One possible (53)is to make it more expensive for peopleto use their cars by (54)charges for parking and (55)tougherfines for anyone who (56)the law．In addition，drivers could be required to pay for using particular routes atdifferent times of the day．This system， (57)as“road pricin9”，is alreadybeing introduced in a (58)of cities，using aspecial electronic card (59)to the windscreen of the car．
Another way of (60)with the problem is to provide cheapparking on the (61)of the city，and strictly control the number ofvehicles allowed into the centre．Drivers and their passengersthen use a special bus (62)for the final stage of their journey,Ofcourse．the most important (63)is to providegood public transport．However，toget people to (64)the comfort of their cars，publictransport must be felt to be reliable，convenient andcomfortable，with fares__ (65)at an acceptablelevel．

A . case
B . event
C . thing

参考答案：

● 参考解析

the mst importantthing为惯用语，表示“最重要的事是……”，根据句意，作者要表达的是“最重要的事情还是提供良好的公共交通”，因此thing为正确答案，其他三项均不合适，故选D。