单项选择题

A．A scientist and his assistant.
B．A physician and a nurse.
C．A psychologist and a news reporter.
D．A professor and his student.
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单项选择题
A．They should not be too strict with the children.B．They should limit their demands on some children.C．They should demand more of their children.D．They should demand more of the bright children.
A．They should not be too strict with the children.
B．They should limit their demands on some children.
C．They should demand more of their children.
D．They should demand more of the bright children.
单项选择题
A．The population of elderly people.B．Nuclear weapon.C．Standard of living.D．Violence in crime.
A．The population of elderly people.
B．Nuclear weapon.
C．Standard of living.
D．Violence in crime.
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