In march,2008, Medvedev was elected _______ president of Russia­­­­—________ position he will hold for 6 years.

A．a; a

B．不填；a

C．the; a

D．the; the

（）步行上下班时，区间应在路肩或路旁走行；双线区间，应面迎列车方向；通过桥梁、道口或横越线路时，应做到“一停、二看、三通过”，严禁来车时抢越。