Where's my schoolbag?
A:That's my schoolbag.
B:It's my schoolbag..
C:It's over there.
过双曲线x2a2-y2b2=1(a>0,b>0)的一个焦点F引它的渐近线的垂线,垂足为M,延长FM交y轴于E,若FM=2ME,则该双曲线的离心率为( )