填入下列文段空白处的词语，最恰当的一组是（    ）

   乐音在基本确定了音高的范围后，有规律的声音节奏或声音组合   ①  成了让人产生美感的第一要素。   ②   声音仅仅含有节奏和有序性，  ③   不能成为“好声音”，钟表的“滴答”声、音乐节拍器的摇摆是最精准的节奏声音，  ④   它却无法给人以美感，  ⑤   会带来厌烦。  ⑥  ，为了使美好的声音成为艺术，还必须具备下一个条件：声音变化的丰富性。

能分泌胆汁的器官是____ ，能最先消化蛋白质的器官是____ ，消化吸收的主要器官是____ ，能将食物残渣形成粪便的器官是____ 。

    It's sunny today. The sun is shining(照耀)in the sky and it's very hot. Nancy goes to the train station(车站)to meet her mother at noon. She walks in the street. There are no trees and she's fat. So she feels very hot. But she doesn't find (发现)a boy walking behind her. And she meets a friend and says "Hello" to him. "Who's the boy behind you?" asks(问) the man. Now she sees the boy. She is angry and asks, "Why(为什么) do you walk behind me, boy?" there's no shade(阴凉处) in the street, you know" answers the boy. "It's cool behind you, I think(想)."

—You mean if Sue comes you'll come?