1942年春，美国罗斯福总统说：“假如没有中国，……有多少师团的日本兵可以调到其他方面来作战？他们可以打下澳洲、印度，打败俄国。”其主要意思是说

我们要消除烦恼，悦纳自己，就要（    ）

①充分发扬自己的长处和优点                         ②走自己的路，不在乎别人的批评建议

③正确认识自己，克服不足，提高自制力     ④勇敢地面对自己的缺点、不足或缺陷

    In Canada you can find dogs, cats, horses etc, in almost every family. These are their pets. People love these pets and pets are their good friends. Before they keep them at their houses, they take them to animal hospitals to give them needles(针) so that they won't carry disease(疾病). They have special animal food shops, though they can get animal food in almost every shop. Some people spend about two hundred Canadian dollars a month on animal food.

    When you visit people's homes, they would be very glad to show you their pets. You will also find almost every family has a bird feeder (喂食器) in their garden. All kinds of birds are welcomed to come and have a good meal. They are free to come and go and nobody can kill any animal in Canada. They have a law to stop people from killing wild(野生的) animals. If you killed an animal, you would be punished(处罚). If an animal happened to get run over(被碾)by a car, people would be very sad about it.

    People in Canada have many reasons to like animals. One of them is: When children grow up, they leave their parents and start their own work and life. Then their parents will feel lonely, but pets can help them. They can be good friends and never leave them alone.

（Ⅰ）求椭圆C的方程和其“准圆”方程；

（Ⅱ）点P是椭圆C的“准圆”上的动点，过点P作椭圆的切线l₁，l₂交“准圆”于点M，N．

（ⅰ）当点P为“准圆”与y轴正半轴的交点时，求直线l₁，l₂的方程并证明l₁⊥l₂；

（ⅱ）求证：线段MN的长为定值．