A:Danny is not nine years old. He is eleven.
B:—When is your birthday?—My birthday is September 12.
— Of course. He by people all over the world.
图中阴影部分表示四种植物的共同特征,这一特征是( )
如图所示,点E是平行四边形ABCD的边CB延长线上的点,AB与DE相交于点F,则图中相似三角形共有( )对.