单项选择题

A．At noon.
B．In the afternoon.
C．In the evening.
D．In the morning.
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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．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.
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