A. Guess!

B. When is your birthday?

C. Yes. My birthday is on Dec. 2nd. It is my eleventh birthday this year. What about you?

D. Is your birthday in December?

E. My birthday is on Sept. 4th.

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小明做了如下操作：

将△ABC绕着边AC的中点旋转180°得到△CEA，将△ABD绕着边AD的中点旋转180°得到△DFA，如图②，请完成下列问题：