单项选择题

A．There are no rapids or waterfalls.
B．There is a constant, strong wind.
C．Navigation is rather difficult.
D．Frequent storms cause problems for riverboats.
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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.
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.
单项选择题
A．The population of elderly people.B．Nuclear weapon.C．Violence in crime.D．Living standards.
A．The population of elderly people.
B．Nuclear weapon.
C．Violence in crime.
D．Living standards.
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