—Thank you for giving me so much help.

—_____. [ ]

A. Don't say so

B. No thanks

C. It doesn't matter

D. That's all right

读我国某区域多年气温和河流径流量统计图，请判断该河流的主要补给类型为（  ）

A．雨水

B．冰川融水

C．地下水

D．积雪融水