伞形花内酯属于( )
A．简单香豆素
B．线型呋喃香豆素
C．角型呋喃香豆素
D．线型吡喃香豆素
E．角型吡喃香豆素
参考答案：A
The boy, rather than his friends, _________ for the accident.
A．are responsible
B．were responsible
C．be responsible
D．is responsible
九宾：古代祭祀活动中最隆重的礼节。
