单项选择题

According to the article we know it is ______ to prevent the forest from slowly disappearing.

A．necessary but impossible
B．necessary but difficult
C．impossible and unimportant
D．difficult and impossible
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单项选择题
In the last two paragraphs the writer wanted to make it clear that ______.
A．where there are no trees, the soil becomes hard and poor
B．where there are many trees, there are fewer floods
C．where there are no trees, the land might become desert slowly
D．floods will make the land become desert
单项选择题
In the writer's opinion, ______, or the forests slowly disappear.
A．measures must be taken
B．people shouldn't draw benefit from trees
C．government must realize the serious results
D．unless trees never be cut down
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