Ⅳ型超敏反应的发生机制主要为：（）
A．抗原抗体复合物沉积激活补体系统，产生膜复合物和过敏毒素，引起细胞损伤
B．抗体与细胞表面抗原结合，在补体系统等参与下造成细胞损伤
C．抗原经APC加工处理后，形成抗原肽-MHCⅠ/Ⅱ类复合物，刺激T细胞分泌细胞因子，造成细胞损伤
D．IgE与肥大细胞和嗜碱性细胞表面的IgE的FC受体结合，释放生物素引起过敏反应
参考答案：C
Great collection Ed Smith has a great sports collection. He 51 8 tennis rackets, 9 basketballs, and 7 baseballs. He has 3 soccer balls and 5 volleyballs. But he 52 play sports—he only watches them 53 TV. Sonia Hall has a sports collection, too. She has 5 baseballs,8 basketballs,4 tennis rackets, and three soccer balls. She 54 sports every day.
|