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 diseas
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单项选择题
A．His boss.B．His employee.C．His partner.D．His teacher.
A．His boss.
B．His employee.
C．His partner.
D．His teacher.
单项选择题
A．Mary’s son.B．The man’s son-in-law.C．Mary’s fiance.D．The man’ s son.
A．Mary’s son.
B．The man’s son-in-law.
C．Mary’s fiance.
D．The man’ s son.
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