单项选择题

A．His job as a police officer.
B．His personal life.
C．How stressful patrol work is.
D．How police officer are taught to deal with stress.
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单项选择题
A．Boston schools.B．Frontier life.C．Teaching requirements.D．Immigration patterns.
A．Boston schools.
B．Frontier life.
C．Teaching requirements.
D．Immigration patterns.
单项选择题
A．It served as a fertilizer for crops.B．It formed a new mountain.C．It stabilized air temperatures.D．It destroyed various insect pests.
A．It served as a fertilizer for crops.
B．It formed a new mountain.
C．It stabilized air temperatures.
D．It destroyed various insect pests.
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