下列哪项不是威胁生物多样性的原因（　　）

①乱捕乱杀、乱砍乱伐   ②发展生态农业       ③围湖造田

④生物入侵            ⑤建立自然保护区     ⑥环境污染．

民族平等、团结、共同繁荣是我国处理民族关系的原则。下列做法体现了该原则的有（   ）
①尊重各民族的宗教信仰、风俗习惯、语言文字  ②帮助少数民族地区发展经济
③在少数民族聚居区实行民族区域自治制度          ④实施少数民族考生高考加分的照顾政策

     A woman is having some trouble(患病) with her eyes, so she goes to see the doctor. He is a new doctor and doesn’t know her, so he asks some questions and one of them is, “How old are you?”

     The woman says, “I don’t know, doctor, but let me think about it.” She thinks for a few minutes and then says, “Yes, I know now, doctor! When I marry(结婚), I am eighteen years old, and my husband is thirty. Now my husband is sixty. And that is twice(两倍) thirty. So I am twice eighteen. That’s thirty-six, isn’t it?”

如图，设抛物线C₁：y²=4mx（m＞0）的准线与x轴交于F₁，焦点为F₂；以F₁，F₂为焦点，离心率e=$\frac{1}{2}$的椭圆C₂与抛物线C₁在x轴上方的交点为P，延长PF₂交抛物线于点Q，M是抛物线C₁上一动点，且M在P与Q之间运动．

当m=1时，求椭圆C₂的方程；