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 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.
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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