单项选择题

Why did people cut down trees

A．For advantage.
B．For benefit.
C．For house.
D．For business.
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单项选择题
The reason why a rich country suffered from floods and hunger was that ______.
A．its empire fell to pieces
B．its soil became hard and poor
C．it cut too many trees down
D．without its trees, it could not get any fruit to eat
单项选择题
The writer thinks that trees are useful to man in three ways, the most important of which is that ______.
A．they can keep him from the hot sunshine
B．they can prevent him from floods
C．they can help him to draw quick profit
D．they can prevent him suffering from drought and floods
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