单项选择题

The role of trees is to ______.

A．loose soil
B．keep soil in position
C．harden soil
D．Both A and B.
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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
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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