A
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.
1. The most important points of trees to man is that ________.
A. they help him to stop drought and floods
B. they help him to make money
C. they give him cool
D. they give him wood and other things
2. In many places forests slowly disappear because ________ .
A. many trees have been cut down by man
B. new trees are not well looked after
C. man has not paid enough attention to planting trees
D. all the above
3. Land becomes desert after all trees are cut down because ________ .
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.
4. Which title best fits the passage?
A. Trees and Man
B. The Function of Tree Wood
C. How do People do with Trees?
D. The Usage of Tree Roots
【答案】1. A 2. D 3. D 4. A
【解析】
本文是一篇说明文，树对人类的作用非常大，可以给人类提供木材、提供阴凉、还可以帮助阻止干旱和洪水。但实际情况是很多人砍掉了很多树木，破坏了植被，引起了生态危机。
【1题详解】
细节理解题。根据文章前两句“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.”可知树木的第三个用途“stop drought and flood”最重要，故A项正确。
【2题详解】
细节理解题。根据第二段后三句“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.”可知ABC三项都是树林消失的原因。故D项正确。
【3题详解】
细节理解题。根据文章后三句“The results are even worse: for where there are trees, ….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.”可知当树被砍掉以后，再也没有树来保护水土了，导致良田变成了荒漠。故D项正确。
【4题详解】
主旨大意题。本文是一篇说明文，树对人类的作用非常大，可以给人类提供木材、提供阴凉、还可以帮助阻止干旱和洪水。但实际情况是很多人砍掉了很多树木，破坏了植被，引起了生态危机。所以本文主要讲述的是树和人类的关系，故A项正确。
