单项选择题

A．The change of lifestyle.
B．The change of the nature of occupations.
C．The increase of social wealth.
D．The increase of job opportunities.
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单项选择题
A．Princeton.B．Yale.C．Harvard.D．Stanford.
A．Princeton.
B．Yale.
C．Harvard.
D．Stanford.
单项选择题
A．A couple of days.B．Four days.C．Six months.D．Two weeks.
A．A couple of days.
B．Four days.
C．Six months.
D．Two weeks.
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