可采用免疫增强治疗的疾病是（）。
A.超敏反应
B.移植排斥
C.炎症
D.自身免疫性疾病
E.肿瘤
参考答案：E
On returning from work, _____.
A．John found a letter in the mailbox
B．a letter was found in the mailbox
C．a letter was in the mailbox
D．the mailbox had a letter in it
实施原型化方法的最基本的步骤是：识别基本需求和开发【 】。
