第14题: [单项选择]The advantage of chevrons over straight horizontal bars is that the former ______. A. can keep drivers awake B. can cut road accidents completely C. will have a longer effect on drivers D. will look more attractive 参考答案:C 答案解析:本题考查对文章重要情节或细节理解的准确性。本文中人字形线区别于垂直横线正是重要细节,人字形线的优越之处在于它能在较长的时间内对驾驶人员起作用。可见,本题的答案是C项。