Trees are useful to man in three important ways: They provide him with wood and other prod

Trees are useful to man in three important ways: They provide him with wood and other products; they provide him shade;. and they help to prevent droughts（早灾）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 soil allowing the rain to sink in and also bind（固定）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 the top-soil is gone, nothing remains but worthless desert.
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 set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation（饥荒）．
【小题1】The most important service of trees to man is that ．A．they give them wood and other productsB．they give them shadeC．they help him prevent droughts and floodsD．they help him made money【小题2】In many parts of the world, forests slowly disappear because ．A．many trees have been cut down by manB．man has not paid enough attention to planting treesC．new trees are not looked after properlyD．all the above【小题3】Land becomes desert after all trees are cut down because ．A．roots of trees break up the soilB．there are too many rainfallsC．there are no larger trees to keep rain and protect the top-soilD．strong winds bring a lot of sand【小题4】The country mentioned in the passage suffered from floods and starvation because .A．it set up an empireB．the empire fell to piecesC．it built too many warshipsD．it lost its trees【小题5】Which title best fits the passage?A．Trees and ManB．How Trees Prevent Droughts and FloodsC．How an Empire FellD．A Story about Trees.C

(答案→)C 解析：【小题1】细节题:从第一段的句子: They provide him with wood and other products; they provide him shade;. and they help to prevent droughts（早灾）and floods.可知答案是C【小题1】细节题:文章第二段提到ABC的内容都是原因,选D【小题1】细节题:从第三段的内容: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 the top-soil is gone, nothing remains but worthless desert.可知没有大树,表层泥土就会流失,导致沙漠的形成.选C【小题1】推理题:从最后一段的句子:without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation（饥荒）．看出是因为没有树木造成的.选D【小题1】主旨题:从第一段的主题句:Trees are useful to man in three important ways:可知是讲—树和人类的关系.选A

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