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
What is the most important function of trees
A．Providing fuel.
B．Offering shade.
C．Preventing natural disasters.
D．Providing charcoal.
单项选择题
What eventually happened to the rich, powerful country 2 000 years ago
A．Its people died of hunger.
B．It fell to pieces.
C．It became a giant empire.
D．It built many ships with wood.
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