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
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单项选择题
The population which is top-heavy with older people poses a problem to______.
A．the government
B．the economy
C．the workforce
D．all of the above
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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