题目

应用文写作假如你是李华, 你班交换生Amy这两天因身体不适, 未能到校上课,请给她写一封邮件,要点如下:1)表示安慰;2)询问他是否能参加下周六学校举行的足球比赛;3)邀请他下个月到你家共度端午节(the Dragon Boat Festival)注意:1)词数80左右;2)可以适当增加细节,以使行文连贯。 答案:Dear Amy,I am so sorry to learn that you suddenly fell ill. Hopefully you'll soon be all right. As scheduled, our football match will take place next Saturday. I would greatly appreciate it if you can be involved in it by then. By the way, our traditional Dragon Boat Festival is coming next month. My family and I are all expecting your coming to enjoy the authentic festive atmosphere with us. Don(本题满分15分)   设椭圆, 已知    (Ⅰ)  求椭圆E的方程;   (Ⅱ)已知过点M(1,0)的直线交椭圆E于C,D两点,若存在动点N,使得直线NC,NM,ND的斜率依次成等差数列,试确定点N的轨迹方程.
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