题目

—Could you help me with the math problem? —_____You must be barking up the wrong tree．        A．A pleasure．                           B．Hang on a minute．        C．What's the point?                        D．Are you kidding? 答案：D在直角三角形中，已知一条直角边的长为6，斜边上的中线长为5，则其斜边的高为______．