题目

阅读理解InEngland recently three foreign gentlemen came to a bus stop and waited. Aboutfive minutes later, the bus they wanted came along. They were just going to geton when suddenly there was a loud noise behind them. People rushed onto the busand tried to push them out of the way. Someone shouted at them. The busconductor came rushing down the stairs to see what all the trouble was about. Thethree foreigners seemed all at sea and looked embarrassed. No one hadtold them about the British custom of lining up for a bus that the first personwho arrives at the bus stop is the first person to 元朝实行一省制，“一省”是指 A．中书省 B．门下省 C．尚书省 D．内史省