—Would you like to come to the dinner party this Saturday?            

—I’d love to, ______ I’ll have to look after my mother at home. She’s ill. [      ]

A. so              

B. and            

C. or              

D. but

引起子痫抽搐的主要原因是

A．血内尿素氮、尿酸、肌酐升高

B．脑小动脉痉挛，脑水肿

C．颅内出血

D．内毒素

E．代谢性酸中毒