题目

Happy birthday! Do birthday really make people happy? Of course they do. Birthday celebrate the day when we were born. Besides, that extra candle on the cake suggest another year of growth and maturity—or so we hope. We all like to imagine that we are getting wiser and not just older. Most of us enjoy seeing the wonder of growth in others, as well. For instance, seeing our children develop and learn new things makes us feel proud. For Americans, like people in most cultures, growing up is a wonderful process. But growing old? That is a different story. Growing old is not exactly for people i下列说法中，正确的是 A．两个全等三角形一定关于某直线对称 B．等边三角形的高、中线、角平分线都是它的对称轴 C．两个图形关于某直线对称，则这两个图形一定分别位于这条直线的两侧 D．关于某直线对称的两个图形是全等形