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  3. Trees are useful to man in three very important ways, they provide him with wood and other products; they give him shade; and th

Trees are useful to man in three very important ways, they provide him with wood and other products; they give him shade; and th

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问题     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 not only mean that the villagers’ children and grandchildren will have fewer trees. The results are even more serious, for where there are trees their roots break the soil up allowing the rain to sink in—and also bind the soil, thus preventing its being washed away easily but where there are no trees, the rain falls on hard ground and flows away from the surface, causing flood.
What is the passage mainly concerned with?
选项 A、The benefits of trees.
B、Trees and soil protection.
C、The various uses of trees.
D、Different attitudes toward trees.
答案A
解析 本题考查考生对全文主旨的把握。解题方法类似主题概括或题目选择题，如Passage 1第一题。文章讲述了树木的重要作用或益处(benefits)，主要论述了树木在防止自然灾害方面的作用，故选A；B项只是其中一个方面，概括不全面。
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