在压缩机关键截面的统一规定中，（）代表回流器进口截面。
A.3
B.4
C.5
D.6
参考答案：C
My brother _____ many toys when he was a little child.[ ]
A. used have
B. used to have
C. used to be have
D. used having
下列属于潮州音乐的有（）
A.锣鼓乐
B.笛套古乐
C.弦诗乐
D.细乐
