Mrs Wang is Tom’s mother. She is my aunt. Tom is my               .      [ ]

A. cousin

B. twin brother

C. sister    

关于原发性腹膜炎的特点，不正确的是

A．腹腔内无原发病灶

B．多见于女性儿童

C．病原菌经血运到达腹腔

D．常采用非手术疗法

E．应紧急手术