题目

阅读理解      阅读下面的短文，然后根据短文内容，在每小题所给的四个选项中选出最佳选项.A reader wrote to say that she was feeling left out at break because her best friend wasn’t around. Here’s our advice to her—and to all kids who feel lonely sometimes.     It’s hard when a best friend isn’t around—maybe because she moved to a different school or a different class. You may feel lonely at break or lunchtime. You want to have new friends, but how do you make them? Maybe it seems that everybody else already has their friends. But remember,如图，一个二次函数的图象经过点A、C、B三点，点A的坐标为（），点B的坐标为（），点C在y轴的正半轴上，且AB=OC． （1）求点C的坐标； （2）求这个二次函数的解析式，并求出该函数的最大值．