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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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
The conclusion which can be drawn safely from the second paragraph is that __________.
A．a population growth from natural increase leads to a greater proportion of the workforce
B．a large population does not necessarily mean a higher proportion of workforce
C．the larger the number of the aged in a population, the higher the proportion of the workforce
D．if the population has an evenly spread age distribution, the workforce will be lower
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