题目

 二次函数图象的顶点坐标是（ ）Ａ．(1,-2)       Ｂ．(1, 2)      Ｃ．(-1,2)     Ｄ．(-1, -2)   答案：B解析:略 ---I am going to travel to America．Would you consider telling me about your experiences there?---______．Let's discuss it over dinner．A.That's all rightB.Go aheadC.By all meansD.It just depends