It's the third time you late for school this week.
A:were
B:are
C:had been
D:have been
数字城市可以使普通百姓( )
①周游世界各地 ②接受远程教育 ③进行网上购物 ④网上求医
即f(1)= 121+x2 = 12 ;f( 12 )表示当x= 12 时y的值,即f( 12 )= (12)21+(12)2 =15 ;…;则f(1)+f(2)+f( 12 )+f(3)+f( 13 )+…+f(2011)+f( 12011 )=____.