【单选题】What does Sam mainly talk about?
A.
His job as a police officer.
C.
How stressful patrol work is.
D.
How police officers are taught to deal with stress.
【单选题】顺序变量说明事物有序类别,它的数值表现是
【单选题】How often does this accident happen according to the police officer?
C.
It happens from time to time.
【简答题】What does the registration officer need to know when a student is to register?