某患儿因主诉"经常性腹胀、腹痛、腹泻"而入院治疗，父母反映上述症状一般出现于喝鲜牛奶以后，最后诊断为"乳糖不耐受"。

该病的病因是（）

A.食物中毒

B.过敏反应

C.胃肠功能紊乱

D.乳糖酶缺乏

E.胰蛋白酶缺乏

She is not easy to work with,because she is very________in everything,not willing to accept others'

opinions even if she is wrong.[ ]

A．absentminded  

B．stubborn

C．outgoing  

D．confident