A:放回水族箱中接着养,直到它死去
B:丢弃在校园里
C:送回大自然
—She's in the teacher's office.She is busy.
如图,在▱ABCD中,E为CD上一点,连接AE、BD,且AE、BD交于点F,S△DEF:S△ABF=4:25,则DE:EC=( )