Question

14．Trees are useful to man in three important ways：they give him wood and other useful things，they give him cool places，and they help to stop drought and flood．
  Unluckily，in many parts of the world，man has not found that the third of these points is the most important．Man wants to make money from trees，so he has cut them down in large numbers，only to find that without them he has lost the best friends he had．And also，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 worse：for where there are trees，their roots break up soil---make the rain in---and also bind the soil，thus stopping 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 is left but useless desert．
21．The most important points of trees to man isB．
A．they help him to make money
B．they help him to stop drought and floods
C．they give him wood and other things
D．they give him cool
22．In many places forests slowly disappear becauseC．
A．many trees have been cut down by man
B．new trees are not well looked after
C．all the above
D．man has not paid enough attention to planting trees
23．Land becomes desert after all trees are cut down becauseD．
A．roots of trees break up the soil
B．there are too many rainfalls
C．strong winds bring a lot of sand
D．there are no longer trees to keep the rain and protect the top-soil．
24．Which title best fits the passage？D
A．Trees and Man
B．The Function of Tree Wood
C．How do People do with Trees？
D．The Usage of Tree Root s．

Answer 1

分析 本文反映了树木给人类带来的益处和乱砍乱伐树木所带来的危害，旨在告诫人们不要乱砍乱伐．

解答 21．B．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．树木可以提供木材和其他产品，防旱防涝，可知答案是B．
22．C．细节题：文章第二段段意可知关于森林的消失提到ABD的内容都是原因，故选C．
23．D．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D．
24．D．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D．

点评 本篇文章都是细节推理题，答题的已给选项也一般不会和短文相关词语完全相同，需要考生自己理解句子，延伸推理出题目答案，比一般细节理解题偏难．