A. were infected by a single variant of the HIV virus B. were infected by multiple variants of the HIV virus C. were stronger than men D. had anti-body in their body 参考答案:B 答案解析:事实细节题。文章第二段showed most women in the study initially were infected by multiple variants of the HIV vi
第10题: [单项选择]有关荚膜描述错误的是() A. 具有免疫原性,可用于鉴别细菌 B. 可增强细菌对热的抵抗力 C. 具有抗吞噬作用 D. 一般在机体内形成 E. 化学成分可是多糖,也可是多肽等 参考答案:D 答案解析:荚膜是某些细菌在其生长过程中,合成并分泌的多糖或多肽物质。一般而言,在机体内和营养丰富的培养基中都能形成。