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.
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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
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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