On metrorail and metrobus, use a senior/disabled farecard or smartrip card.
2014年高考英语全国卷2 阅读理解 阅读D 原文
Senior citizens and disabled customers can get free guide on how to use proper metrobus and metrorail services by calling 202-962-1100.
2014年高考英语全国卷2 阅读理解 阅读D 原文