作文：

      《这个春天，因_______而美丽》
      要求：①先将题目补充完整，然后作文；②文章要有真情实感；③文中不得出现真实的地名、校名、人名；④不少于600字。

(____)1. Do you like summer?          

(____)2. Is it cold in winter?             

(____)3. Who's that boy with a big nose?

(____)4. Are they your stickers?        

(____)5. Whose coat is that?           

A.Yes, they are.

B.He's my friend,Tom.

C.No,I don't.It's too hot.

D.Bobby's.

E.Yes,it is.

人体的内环境是指（）