单项选择题

A．Boston schools.
B．Frontier life.
C．Teaching requirements.
D．Immigration patterns.
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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.
A．To work in mining operations.
B．To carry scientific supplies.
C．To cross the North American continent.
D．To help cultivate the frontier.
单项选择题
A．Their hardworking spirit.B．Their patience in waiting for theatre tickets.C．Their delight in leisure activities.D．Their enthusiasm for the arts.
A．Their hardworking spirit.
B．Their patience in waiting for theatre tickets.
C．Their delight in leisure activities.
D．Their enthusiasm for the arts.
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