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.

罗斯福新政的特点是（    ）

我能指出下列句中所用的修辞手法。

①她从一个漂亮的小姑娘，一个端庄坚毅的女学者，变成科学教科书里的新名词“放射线”，变成物理学的一个新的计量单位“居里”，变成一条条科学定律，她变成了科学史上一块永远的里程碑。                                          ____

②但是，她视名利如粪土。                                 ____

③她是科学殿堂里一朵熠熠生辉的奇葩。                      ____

“富贵不能淫，贫贱不能移，威武不能屈”说明的道理是（    ）

A．小磁针静止时，A端为N极

B．向右移动滑片P，电磁铁磁性增强

C．电磁铁左端为N极      

D．向左移动滑片P，电磁铁磁性增强

理由：____．