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
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
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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