何谓小节，小节线与双小节线？
参考答案：
音乐有小节，小节则由小节线来划分，双小节线则是用在曲子的结尾
— _____ the boy _____ the second picture?
— He's my cousin, Peter. [ ]
A. Who's, in
B. Who's, of
C. What's, on
D. What's, for
