A：12
B：－2
C：
D：
Introduction of a Band
Band name
The new band is called ____.
Country
The band was set up in ____.
Members
There are four people in the band and they are all ____.
Kind of music
More and more people love to listen to their ____.
The reason why people like them
All of their music sounds comfortable and make people ____.
①： ②：
③： ④ ⑤
，则
的值是（ ）
②： 
④ 
⑤ 
，它是通过加聚反应制得的，其单体是