A:1
B:2
C:3
D:4
Few people knew how to use the Internet in the past,_____?
如图,在△ABC中,AB=AC,AB+BC=8.将△ABC折叠,使得点A落在点B处,折痕DF分别与AB、AC交于点D、F,连接BF,则△BCF的周长是( )