听力原文:M: I am sorry, Miss. Flight 622 has already departed. W: Oh, all right. Could you please tell me where I can find a telephone? What does the woman want to know?
A.
Where to board the plane.
B.
Where to find a telephone.
C.
The flight number.
D.
The departure time.
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【单选题】设如图所示,在下面的5个序列中,符合深度优先遍历的序列有多少?( )【图片】a e b d f c a c f d e b a e d f c b a e f d c b a e f d b c