---                     , but are you forgetting something?

--- Oh, my God. We haven’t fix our next meeting yet.

A．I’m sure

B．I’m afraid so

C．Take care

D．Excuse me

西西伯利亚平原和中西伯利亚高原的分界线是[ ]

A．乌拉尔山  

B．叶尼塞河    

C．鄂毕河

D．勒拿河