黄河流域除洪水威胁、泥沙淤积等问题外，近年来又出现了[ ]

A．新的冲积平原

B．河流改道

C．断流、水污染

D．“地上河”消失

Speaker A. Did you know that Whitney Houston was giving a concert last night in the townSpeaker B: ______

A．Why don't you get some tickets for us

B．I like her, but I didn't have time for the concert.

C．Why didn't you tell me about it earlier

D．Maybe we can go to see her concert some other time.