单项选择题

A．Boston schools.
B．Teaching requirements.
C．Frontier life.
D．Immigration patterns.
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单项选择题
A．They reduce a person’s appetite.B．They make a person less persistent in face of trouble.C．They make a person’s nervous system weak.D．They make a person more vulnerable to disease.
A．They reduce a person’s appetite.
B．They make a person less persistent in face of trouble.
C．They make a person’s nervous system weak.
D．They make a person more vulnerable to disease.
单项选择题
A．To work in mining operations.B．To cross the North American continent.C．To carry scientific supplies.D．To help cultivate the frontier.
A．To work in mining operations.
B．To cross the North American continent.
C．To carry scientific supplies.
D．To help cultivate the frontier.
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