单项选择题

The factor which does NOT influence the size of the workforce is ______.

A．the size of population
B．age distribution of the population
C．national economy
D．natural increase
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单项选择题
Labor force is composed of ______.
A．people who are available to work and earn income
B．self-employed people only
C．only those who are looking for an employment
D．only the employees
单项选择题
When a population is said to be aging, ______.
A．more people are retiring than people entering the workforce
B．the birth rate is growing
C．there is an oversupply of workforce
D．young people outnumber old people
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