—Thank you so much for looking after the children .

—      I enjoyed having them .

A．Absolutely .

B．That’s all right .

C．Exactly .

D．I don’t think so .

秦皮中的香豆素成分结构类型是

A．呋喃香豆素

B．简单香豆素

C．吡喃香豆素

D．无取代基香豆素

E．双香豆素