BRT, which is short for Bus Rapid Transit, is c 小题1:“the underground system on the ground”. It has been in s 小题2:since October 1st , 2012 in Lian Yungang. In the p__小题3:__, the roads in the city were so crowded（拥挤的）that most buses went slowly. Because of this, the city government decided to build BRT. Now, people can go to work by it more e小题4:than before. And if you have a student card, you can have a discount on the t    小题5:.

全国人大代表、北京市常务副市长李士祥3月7日透露，到2020年，北京市人口将控制在（），今年的控制目标为2180万。北京市政法委书记杨晓超表示，控制人口不会靠行政命令。

A.2300万

B.2500万

C.2800万

D.3000万