I prefer____(these/ those) shorts.

    When you feel sad, tears will come down from your eyes. When you are happy, especially when you laugh hard, tears will also come down from your eyes. But tears have a more important job than showing your feelings.
    Tears keep your eyes clean and healthy. They wash away dirt and germs(细菌) just like bath. Your eyes also need tears to keep them wet. And eyes must be wet so that they can move smoothly. Your eyes are busy looking here and there all day long. They move quickly from one thing to another. If you didn't have tears, your eyes couldn't move, and soon you would be blind.
    Maybe you don't like tears, but your eyes can't do without them.

①EF⊥AC；②四边形ADFE为菱形；③AD=4AG；

④FH= $\frac{1}{4}$ BD其中正确结论的为____（请将所有正确的序号都填上）．

依次填入下面一段文字横线处的语句，衔接最恰当的一组是（   ）

    在对待自然的态度上，               。生态不仅是科学问题，而且是伦理问题，正是伦理为科学规定了界限。

①但是，同为主张善待自然，出发点仍有很大分歧

②我的看法是，两派都有道理，但说的是不同层次上的道理，而低层次的道理要服从高层次的道理

③一派反对人类中心论，认为从根本上说，自然是一个应该敬畏的对象

④一派强调以人类为中心，从人类长远利益出发，合理利用自然

⑤合理利用自然是科学，不管合理的程度多么高，仍然是科学，而科学必有其界限

⑥现在大概不会有人公开赞成掠夺性的强盗行径了