激励的目的？

A. Please speak slowly.
B. Please go to the counter over there.
C. Usuallyit takes about two weeks.
D. It’ll take at least two weeks.

A. 隔离病人，管理牲畜
B. 消灭鼠类，注射钩端螺旋体菌苗
C. 保护水源和饮食，防止感染
D. 避免用河沟和池塘的污水洗澡
E. 用石灰水改变农田水质后消灭钩端螺旋体