题目

短文填空 先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的词，是短文意思完整。Are you the only children in your family? If so, you’re the most important person in your family. Parents are the c 1 people to you in the world. But a lot of middle students have a p 2 . They fe el they’re not as close to their parents as before. They even don’t think their parents are f 3 to them.Some students complain that their parents s 4 a lot to them, but never listen to them. Some say their parents don’t a 5 them to play compu如图所示，抛物线m：y=ax2+b（a＜0，b＞0）与x轴于点A、B（点A在点B的左侧），与y轴交于点C．将抛物线m绕点B旋转180°，得到新的抛物线n，它的顶点为C1 ， 与x轴的另一个交点为A1 ． （1）当a=﹣1，b=1时，求抛物线n的解析式；（2）四边形AC1A1C是什么特殊四边形，请写出结果并说明理由；（3）若四边形AC1A1C为矩形，请求出a，b应满足的关系式．