Mr. Black is strongly _____ keeping animals in the zoo, because he thinks animals should also have the right to enjoy freedom. A. up B. for C. against D down 答案:C 有一个二次函数的图象,三位学生分别说出了它的一些特点.甲:对称轴是直线x=4;乙:与x轴两交点的横坐标都是整数;丙:与y轴交点的纵坐标也是整数,且以这三个交点为顶点的三角形面积为3;请写出满足上述全部特点的二次函数解析式: .