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  3. Threes are useful to man in three very important ways：they provide him wood and other products；they give him shade；and they help

Threes are useful to man in three very important ways：they provide him wood and other products；they give him shade；and they help

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问题     Threes are useful to man in three very important ways：they provide him wood and other products；they give him shade；and they help to prevent drought (干旱) and floods.
    Unfortunately, in many parts of the world, man bas not realized that the third of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down in large numbers.
    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 bare and poor. When the empire fell to pieced, the country found itself faced by floods and starvation.
    Even where a government realizes the importance of a plentiful supply of trees, it is difficult sometimes to make the people realize this. They cut down the trees but are too careless to plant and look after new trees. So, unless the government has a good system of control, or can educate the people, the forests slowly disappear.
    This does not only mean that there will be 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. This prevents the soil from being washed away. But where there are no trees, the rain falls on hard ground and flows away on the surface, and this causes floods and the rain carries away the rich topsoil in which crops grow. When all the topsoil is gone, nothing remains but worthless desert.
Trees are useful to man mainly in three ways, the most important of which is that they can________.
选项 A、Keep him from the hot sunshine
B、enable him to build warships
C、make him draw quick profit from them
D、protect him from droughts and floods
答案D
解析 细节题。原文第一段指出树以三种方式有益于人类，第二段第一句话说世界上许多地方的人不知道第三种最重要，第三种是防旱防洪，因此选项D是正确答案。
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