单项选择题

Wages for worker in the public ______ of the economy don't always keep up with those for worker in the private ones.

A．branch
B．sector
C．portion
D．section
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单项选择题
The present universal fear has been the result of a forward surge in our knowledge and ______ of certain dangerous factors in the physical world.
A．automation
B．perception
C．manipulation
D．administration
单项选择题
People who live in small towns often seem more friendly than those who living in __ populated areas.
A．thickly
B．densely
C．heavily
D．keenly
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