单项选择题

A．To work in mining operations.
B．To carry scientific supplies.
C．To cross the North American continent.
D．To help cultivate the frontier.
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What if a child has poor chemistry with the teacher
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.
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