植物：松树：长寿 最合适的一项是：

A. 生石灰：碳酸钙
B. 水：水蒸气
C. 砷：砒霜
D. 小麦：面粉

A．"Intro" makes you want to hear what is coming next.
B．It tells the story of the song before the first lyric starts. 
C．All of the other options.
D．The elements of a song, the groove, and the atmosphere are all introduced in the intro.