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
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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
单项选择题
Which of the following is true
A．Man has cut trees down in large quantities in order to make warships with which to gain an empire.
B．Man has cut trees down in large quantities only to find that with them gone times become harder for him.
C．Man has cut trees down in large quantities where the soil is hard and poor.
D．Man has cut trees down in large quantities because he has not come to know the importance of the first of the services trees do to him.
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