单项选择题

A．Weights and measurement.
B．Political system.
C．Employment.
D．Money.
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单项选择题
According to the author, it will take about ______to reconstruct new white-collar world.
A．4 years
B．10 years
C．37 years
D．a century
单项选择题
A．reasonB．informationC．warningD．voice
A．reason
B．information
C．warning
D．voice
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