下列哪些因素可能与自身免疫性疾病有关()
A．微生物感染
B．环境因素
C．基因缺陷
D．遗传因素
E．激素水平异常
参考答案：A, B, C, D, E
---I think teenagers should be allowed to have part-time jobs.
---_______. Studying is more important for them.
A．I agree.
B．I disagree
C．I don’t know
D．Me, too
以上意见，如有不当，请即批转有关单位执行。
