[单项选择] Trees are useful to man in three very important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts (干旱) and floods.
Unfortunately, man has not realized that the third of these services is the most important. Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It gained the empire, but, without its trees, its soil became hard and poor. When the empire fell to pieces, the home—country found itself faced by flood and starvation.
Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade villagers to see this. The villagers want wood to cook their food with; and they can earn money by selling wood. They are usually too lazy to plant and look after the trees. So, unless the government has a good system of control, or can educate the people, the forests will slowly disappear.
This does no A. want a plentiful supply of trees. B. want firewood badly. C. just want to get money. D. don’t realize the importance of trees.
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[简答题]Trees are useful to man in three very important ways: they pro vide him wood and other products; they give him shade; and they help to prevent drought and floods.