why do brids fly south in the winter?是脑筋急转弯的

网友回答

beacust there is high building in North
======以下答案可供参考======
供参考答案1:
For it's too slow to walk.
供参考答案2:
‘cause they are birds，lol
供参考答案3:
惊...2楼这英语...您这12级肯定不是答英语问题答出来的吧?
供参考答案4:
because it is too far to walk.
供参考答案5:
because this winter so biterly cold.