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
What does the passage mainly talk about
A．The three benefits provided by trees.
B．Trees and soil conservation.
C．The various uses of trees.
D．The different attitudes of the government and the villagers toward trees.
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