题目

______ good news report it is! I think you should read it carefully. A. What   B. HowC. What an D. What a 答案：D如图，Rt△ABC放置在第二象限内，AC⊥x轴，已知∠ABC＝90°，OC＝3，OB＝4．则点A的纵坐标是          。