This toy be Amy's. She is the only kid at the picnic.
A:can
B:must
C:need
D:can't
已知,如图∠1=∠2,∠3=∠4,求证:BC∥EF.
证明:∵∠1=∠2
∴____∥____ (____)
∴____=∠5 (____)
又∵∠3=∠4
∴∠5=____ (____)
∴BC∥EF (____)
下列叙述正确的是( )