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
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
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