第17题: [单项选择]结核病灶中巨噬细胞转变为类上皮细胞是由于() A. 吞噬的结核杆菌毒力较强 B. 吞噬的结核杆菌释放毒素 C. 吞噬的结核杆菌不能被杀死 D. 吞噬的结核杆菌数量过多 E. 吞噬的结核杆菌破坏、释放出磷脂 参考答案:E
第18题: [单项选择]He told a story about his sister who was in a sad ______ when she was ill and had no money. A. plight B. polarization C. plague D. pigment 参考答案:A 答案解析:plight 困境,polarization分化,plague 瘟疫、天灾,pigment色素,颜料。