第32题: [单项选择]下列可引起二重感染的抗菌药物是 A. 四环素 B. 红霉素 C. 氯霉素 D. A+B E. A+C 参考答案:E 答案解析:可引起二重感染的抗菌药物主要是四环素类和氯霉素等广谱抗生素。正常人的口腔、鼻咽、肠道等都有微生物寄生、菌群间维持平衡的共生状态。广谱抗生素长期应用,使敏感菌受到抑制,而不敏感菌趁机在体内繁殖生长,造成
第34题: [单项选择]The author believes that the trumpet is particularly important because it ______. A. can be used in rock bands B. has historical significance C. is a religious instrument D. has a narrow range 参考答案:B 答案解析:文中最后一段指出The trumpet family is much than...It is a link to many different period of history...因此小号具有历