单项选择题

Why did the country mentioned in the passage suffer from floods and starvation

A．Because an empire was set up.
B．Because the empire fell to pieces.
C．Because it lost all its trees.
D．Because too much had been spent on wars.
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单项选择题
What does the author tell us in this passage
A．How trees help prevent droughts and floods.
B．The relationship between trees and man.
C．How an empire fell to pieces in ancient times.
D．A story of trees.
单项选择题
Why do forests in many parts of the world slowly disappear
A．New trees are not looked after properly.
B．Many trees have been cut down by man.
C．Man has not paid enough attention to planting trees.
D．All of the above.
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