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
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 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
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