杀菌作用
参考答案：
直接把病原菌杀死。
The number of pandas is getting _____ because they don't have enough living areas. [ ]
A. more and more
B. larger and larger
C. smaller and smaller
D. fewer and fewer
突发公共卫生事件所在地报告时间（）
A.2小时
B.3小时
C.4小时
D.6小时
E.1小时
