单项选择题

A．Michael has been diving for nine years.
B．Michael dives on holidays with his parents.
C．Michael loves diving ever since he first tried it.
D．Michael has never taken any diving courses.
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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 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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