麝香中代表性的大环酮类化合物是（）
A.麝香酮
B.降麝香酮
C.雄性酮
D.氨基酸
E.肽类
参考答案：A
— You should apologize to her, Barry.
— _______, but it's not going to be easy.[ ]
A. I feel so
B. I prefer to
C. I like to
D. I suppose so
中心法则
