C ．免疫缺陷病                                                       D ．病毒持续性感染

5 ．补体固有成分中，在血清中含量最高是 (       )

A ． C1                                                                    B ． C4

C ． C3                                                                    D ． C9

6 ．对人体而言，属隐蔽自身抗原的物质是 (       )

A ． Rh 抗原                                                             B ．眼葡萄膜色素抗原

C ．金黄色葡萄球菌肠毒素                                     D ．甲胎蛋白 (AFP)

7 ． T_H1 细胞能分泌的细胞因子是 (       )

A ． IL-1                                                                  B ． IL-4

C ． IFN-γ                                                                D