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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.
The role of trees is to______.
选项 A、loosen soil
B、keep soil in position
C、harden soil
D、both A and B
答案D
解析 本题考查考生的总结能力及对具体细节的理解。答案对应文章最后一段的第二句话：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．这句概括树木的作用为松弛、固定土壤。也可走捷径，从连词also看应为两个作用，故选D。
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