机体的免疫系统具有杀灭或排斥突变细胞功能称为（）
A.免疫防御
B.免疫自稳
C.免疫监视
D.免疫应答
E.免疫识别
参考答案：C
— Sorry, Professor Smith. I didn't finish the assignment yesterday.
— Oh, you _____ have done it as yesterday was the deadline. [ ]
A. must
B. mustn't
C. should
D. shouldn't
甲苯胺及其衍生物以及它们的盐
