A:interviewing; to prepare
B:interviewed; to prepare
C:interviewing; preparing
D:being interviewed; preparing
下列加线词的解释不正确的一项是( )
在椭圆x2a2+y2b2=1a>b中,记左焦点为F,右顶点为A,短轴上方的端点为B,若∠BFA=30°,则椭圆的离心率为( )