Section A:描述声音的常用词语
　　I could hear the sound of voices/music coming from the next room. [ neutral ]
　　Our neighbours had a party last night.The noise went on till 3 a.m.. [ loud,unpleasant sounds ]
　　I tried hard to hear what she was saying above the din of the traffic. [ very loud,irritating noise ]
　　The children are making a terrible racket upstairs.Could you go and tell them to be quite? [ very loud,unbearable noise,often of human activity ]
　　解说：racket（喧闹）和 din（吵闹）是不太正式的词。 noise（嘈杂）可以是可数的，也可以是不可数的。表示比较短的声音时，它是可数的，表示很多的频繁的或持续的声音时，它是不可数的。
　　Their lawnmower makes a lot of noise,doesn`t it? [ uncountable ]
　　I heard some strange noises in the night. [ countable ]
　　Section B:表示声音的词以及发出这些声音的典型物体
　　这些词可以做名词，也可以用作动词：
　　I could hear the rain pattering on the roof.
　　We heard the patter of a little child`s feet.