题目

Today was a busy morning, about 7:30, when an elderly woman in her 90s came to the hospital. I heard her saying to the nurse that she was in a hurry as she had an appointment at 8:00. The nurse had her take a   21   in the waiting area,   22  her it would be at least 30 minutes   23  someone would be able to see her. I saw her  24  her watch and decided, since I was   25   busy ---my patient didn't   26   at point hours --- I would exam her wound. While taking care of her wound, I asked her if she had another doctor's appointment. The woman said no and told me that下列关于人体免疫的叙述不正确的是（　　） A、吞噬细胞吞噬侵入人体的链球菌，是特异性免疫B、人体的第三道防线主要是由免疫器官和免疫细胞组成C、体液中的溶菌酶，能够破坏许多种病菌的细胞壁，使病菌溶解，是人体的第二道防线D、感染发生时，病原体已经突破了三道防线