题目

________ at the photos, illustrations, title and headings and you can guess what the reading is about. A . To look B . Looking C . Having looked D . Look 答案：D抛物线y=（x+2）2+3的顶点坐标是（ ）A．（﹣2，3） B．（2，3） C．（﹣2，﹣3） D．（2，﹣3）