1、单选题：
An outbreak of a contagious disease that spreads rapidly and widely. （ ）
选项：
A:bio-statistics
B:epidemic
C:hypertension
D:sanitation
答案: 【epidemic】

2、单选题：
A condition or practice conducive to the preservation of health,as cleanliness. （ ）
选项：
A:environment
B:hygienic
C:hygienically
D:hygiene
答案: 【hygiene】

3、单选题：
A watch kept over a person,group,etc.,especially over a suspect, prisoner, or the like.（ ）
选项：
A:surveillance
B:supervise
C:surveille
D:surveillant
答案: 【surveillance】

4、单选题：
The period of time during which a person or animal that has a disease or that might have a disease is kept away from others to prevent the disease from spreading. （ ）
选项：
A:isolation
B:quantum
C:quantity
D:quarantine
答案: 【quarantine】

5、单选题：
The death of large numbers(as of people or animals). （ ）
选项：
A:mortality
B:morbidity
C:probability
D:chance
答案: 【morbidity】