注射破伤风抗毒素(1FAT)的目的是
A. 对易感人群进行预防接种
B. 杀灭伤口中繁殖的破伤风杆菌
C. 对可疑或确诊的破伤风患者进行紧急预防或治疗
D. 主要用于儿童的预防接种
E. 中和与神经细胞结合的毒素
"A classic economic example of zero-sum boom" (Paragraph 3) connotes
A. economic slack.
B. continued strength.
C. economic recovery.
D. job security.
The writer mentions the political elements in 19th century opera to illustrate
A. the political messages exposed.
B. the universal recognition of high art.
C. the intended changes in popular art.
D. heroes' and heroines' mental states.
在感染过程的5种表现中，所占比例最低，易识别的是
A. 病原体被清除
B. 隐性感染
C. 显性感染
D. 病原携带状态
E. 潜伏性感染
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