如图1，过点A作AF⊥AB，并截取AF=BD，连接DC、DF、CF，判断△CDF的形状并证明；

已知椭圆C： $\frac{x^2}{a^2}$ + $\frac{y^2}{b^2}$ =1 （a＞b＞0 ） 经过点 P（1， $\frac{\sqrt{3}}{2}$  ），离心率 e= $\frac{\sqrt{3}}{2}$

（Ⅰ）求椭圆C的标准方程．

（Ⅱ）设过点E（0，﹣2 ） 的直线l 与C相交于P，Q两点，求△OPQ 面积的最大值．

语法填空
    Friendship is a kind of human relationship. It is a human instinct to make friends. When ____ trouble, we need friends to offer us help, support and encouragement. With success achieved, we also need friends to share our joys.
    Friendship is also one of the greatest ____ (pleasure) that we can enjoy. It implies loyalty, cordiality, sympathy, affection and readiness to help. No man can make ____ most of his life  without ____ (careful) and conscientiously（认真地）struggling to win the right kind of friends as he ____ (go) along.
    Knowing how ____ (value) friendship is, we should be very careful in making friends. Real friends are those who have good character, superior ability and kindness of heart. Real friends can share all our sorrows and double all our joys. ____making friends, we should take care ____ (select) those who have such fine qualities. We should forgive their failures and do our best to help them. In short, when we have established friendship, we ought to cherish and treasure it ____ means of words and deeds. Only thus, can we develop real friendship and keep the sacred lamp of friendship ____ (burn) all of life.

一短跑运动员在5s内跑完了50m，汽车行驶的速度是54km/h，羚羊奔跑的速度是20m/s，那么三者速度从小到大的顺序是  （   ）

Please          these things to your brother．He is at school