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
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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.
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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