人体的呼吸系统由呼吸道和____ 组成，其中呼吸道是气体进出人体的通道，包括鼻、____  、____  、____  和支气管等部分； ____ 是人体内部与外界环境之间进行气体交换的场所。

下列各民族与其传统节日搭配正确的是    (    )  

—Too much homework has made me tired these days, Mr. Wang.

—That's true. But a small tree won't grow into a big tree      it experiences lots of winds and rains.