His failure made his father think him a ___________ boy.
A:disappoint
B:disappointed
C:disappointing
D:disappointment
已知△ABC周长为1,连结△ABC三边中点构成第二个三角形,再连结第二个三角形三边中点构成第三个三角形,以此类推,第2014个三角形的周长为 ____.
设等差数列an的前n项和为sn,若a1=-11,a4+a6=-6,则当sn取最小值时,n等于( )
—About three____(英里).