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
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
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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