- How was the performance last night?

- It was so good. Though it ＿＿＿＿＿＿ nearly four hours, few people left early.

A．covered

B．reached

C．lasted

D．played

昆山市巴城镇为解决交通拥堵，改变盲目增加公交班次策略，通过高频市镇和低频镇域车的衔接，增加镇域公交覆盖率。这启示我们

①遵循系统内部结构的有序性             ②注重系统内部结构的优化趋向

③整体功能大于各部分功能之和           ④关键部分的功能决定整体功能

A．①②

B．①③

C．②④

D．③④