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 conclusion which can be drawn safely from the second paragraph is that __________.
A．a population growth from natural increase leads to a greater proportion of the workforce
B．a large population does not necessarily mean a higher proportion of workforce
C．the larger the number of the aged in a population, the higher the proportion of the workforce
D．if the population has an evenly spread age distribution, the workforce will be lower
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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