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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, in many parts of the world, man has 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 (帝国). It gained the empire but, without its trees, its soil became bare and poor. When the empire fell to pieces, the country found itself faced by floods and starvation (饥饿).
   Even though 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 will 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.
Sooner or later the forests will disappear unless______.
选项 A、all people are taught the importance of planting trees
B、a country has a plentiful supply of trees
C、the government punishes those who cut down trees instead of planting them
D、people stop cutting down their trees
答案A
解析 根据第四段第一句“…it is difficult sometimes to make the people realize this．”和最后一句“So，unless the government has a good system of control，or can educate the people，the forests will slowly disappear．”可知，人们有时很难意识到树木的重要性，因此除非政府有良好的管控体系，或者教育人们意识到树木的重要性，否则森林会渐渐消失。由此可推知，除非所有人都被教导植树的重要性，否则森林迟早会消失。故选A。
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