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．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.
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Moreover
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