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
It is implied in the passage that the villager ______.
A．wants a plentiful supply of trees
B．wants fire wood
C．wants to get money
D．is not aware of the importance of environmental protection
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