Question

13．Trees are of great use to man in three important ways：they offer him wood and other useful things，they give him cool places，and they help to stop dr ought and flood．
In many parts of the world，unfortunatel y，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 b ind（粘合，凝结） 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．
12．The most important points of trees to man isA．
A．they help him to stop drought and floods
B．they offer him cool places
C．they give him wood and other things
D．they help him to make money  
13．Which is not the reason for forests'slow disappearance in many places？
D
A．Many trees have been cut down by man．
B．New trees are not well looked after．
C．Less attention is paid to planting trees．
D．Global warming．
14．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．no more trees keep the rain and protect the top-soil．
15．Which title best fits the passage？B
A．Trees and Man                             
B．The Function of Tree Wood
C．How do People do with Trees？
D．The Usage of Tree Roots．

Answer 1

分析 本文叙述了树木在人们的生活中起着很重要的作用，短文给出了三个方面的作用．一是树可以给我们提供食物、木头和其他的一些产品．二是树木可以给我们提供树荫．三是树可以防止旱灾和水灾．因此如果人们不保护树木，最终就会发现他们失去了最好的朋友．

解答 12．A．细节理解题．根据第二段In many parts of the world，unfortunatel y，man has not found that the third of these points is the most important可知树对人类最重要的一点是他们帮助他阻止干旱和洪水；故选A．
13．D．细节理解题．根据第二段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可知森林消失在许多地方的原因是大量地砍伐，新树没有得到很好的照顾以及不关注植树；故选D．
14．D．细节理解题．根据最后一段for where there are trees，their roots break up soil-make the rain in-and also b ind（粘合，凝结） the soil，thus stopping it from being washed away easily可知土地变成了沙漠因为没有树木来保持降雨和保护土壤；故选D．
15．B．推理判断题．根据第一段they offer him wood and other useful things，they give him cool places，and they help to stop dr ought and flood可知最佳标题为树木的作用；故选B．

点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．