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.

下列实验现象叙述正确的是(   )

⑴Can you put up the Christmas tree?  ____

⑵We are going to write Christmas cards to our friends.  ____

⑶Santa is a merry man in red clothes.  ____

⑷It's a Chinese lantern for you.  ____

⑸This morning we open the gifts!  ____

A. B. C. D. E.