题目

If you watch the sky about an hour after the sun goes down, you may see some “moving stars” ．But they’re not real stars．They are man-made satellites．And the biggest of all is the International Space Station（ISS国际空间站）． From now until July is the best season to watch the ISS flying over the earth, and people can see it just with their eyes．The ISS is the biggest man-made satellite because scientists want to live on it．They think that the best way to learn more about space is to live there． When the space station is finished, it will be like a city in space．Peo正方形OABC的边长为4，对角线相交于点P，抛物线L经过O，P，A三点，点E是正方形内的抛物线上的动点．(1)建立适当的平面直角坐标系．①直接写出O，P，A三点坐标；②求抛物线L的表达式；(2)求△OAE与△OCE面积之和的最大值．