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.
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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
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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