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
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
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 work force
B．a large population does not necessarily mean a higher proportion of work force
C．the larger the number of the aged in a population, the higher the proportion of the work force
D．if the population has an evenly spread age distribution, the work force will be lower
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