植物的主要类群由高等到底等的顺序排列起来应是（  ）

①蕨类植物 ②裸子植物 ③被子植物 ④藻类植物 ⑤苔藓植物．

短文改错。假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加，删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(＼)划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1、每处错误及其修改均仅限一词；2、只允许修改10处，多者（从第11处起）不计分。

Dear Abby，

    How are you? Today I've got a wonderful news to tell you. I have offered a scholarship at a university in Australia for my further education. One hundred and twenty students took exam for it, but only a few was chosen and I was one of them. However, my parents are not happy about it. They are strong against me going there. They say it is too far away that they will not see me for a whole year and they are afraid of I will feel lonely. They can't imagine a girl so young live alone. They ask me study in the capital instead. Then I'll be able to continue living with them. How can I persuade them to accept the fact I have grown up？

Best wishes,

Jane

$\frac{2}{13}$ × $\frac{1}{2}$ ____ $\frac{2}{13}$

$\frac{6}{7}$ ÷3____  $\frac{6}{7}$

$\frac{5}{6}$ × $\frac{6}{5}$ ____ $\frac{1}{6}$

（Ⅰ）求 $P$ 的轨迹 $C$ 的方程.

（Ⅱ）过点 $\left(-1,3\right)$ 的直线 $l$ 与 $C$ 交于 $M,N$ 两点，且 $\left|MN\right|=2\sqrt{3}$ ，求直线 $l$ 的方程.