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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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．He is a commercial diver.B．He is an independent photographer.C．He is a camera manufacturer.D．Both A and B.
A．He is a commercial diver.
B．He is an independent photographer.
C．He is a camera manufacturer.
D．Both A and B.
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