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Trees are useful to man in three important ways: they provide wood and other products; they give him shade; and they help to pre
Trees are useful to man in three important ways: they provide wood and other products; they give him shade; and they help to pre
admin
2014-10-11
94
问题
Trees are useful to man in three important ways: they provide wood and other products; they give him shade; and they help to prevent droughts and floods.
Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.
This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soi — allowing the rain to sink in — and also bind the soil, thus preventing it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert.
选项
A、They offer him shade.
B、They provide him wood.
C、They help him stop droughts and floods.
D、They help him make money.
答案
C
解析
答案在文章第一段。树对人类最重要的服务是可以帮助人类防干旱和洪水。
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本试题收录于:
大学英语三级B级题库大学英语三级分类
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