题目

. .It is too bad for someone in such a high _______ in the government to behave badly in public. A. position           B. situation          C. profession        D. condition 答案：A圆心O到直线L的距离为d，⊙O半径为r，若d、r是方程x2-6x+m=0的两个根，且直线L与⊙O相切，求m的值．