环境保护及动物植物 阅读理解材料

环境保护及动物植物阅读理解材料
No. 4 Middle School
Kunming, Yunnan
April 2nd, 2002
Dear editor(编辑),
I live in a beautiful city. Many visitors come to my city. There are so many colorful peacocks(孔雀)here.
The peacocks mostly live on the grass land of Dongfeng Square(广场). They are given food freely by visitors. They usually throw food to them, and don't think about at all whether the food is right or not Some of the peacocks became ill , some even died after eating the bad food given by the visitors.
I'm sure most of the visitors who throw food to the peacocks really like the birds, but don't realize(意识到)that they may be doing them harm(伤害).
The visitors should be told that what they have done is very harmful to the birds, and this kind of thing must be stopped from happening.
Perhaps we can build some small shops beside Dongfeng Square to sell peacock food. For us every person, it's our duty to give more love to these beautiful birds and to look after them carefully.
Yours,
Sun Yan
46. Many visitors come to the writer's city to .
A. do some shopping
B. see beautiful peacocks
C. play on Dongfeng Square
D. eat nice food
47. Some peacocks became ill and died because some visitors .
A. didn't give them any food
B. gave them too much food
C. threw them some bad food
D. loved them and played with them
48. Some shops can be built beside Dongfeng Square so that they may .
A. sell food for visitors
B. sell food for peacocks
C. make the square more beautiful
D. have the beautiful birds
49. From the passage we know people should .
A. live and play with the birds
B. stop the birds from eating too much
C. give right food to the birds
D. give more food to the birds
50. We can guess the writer of the letter, Sun Yan, may be a .
A. visitor
B. shopkeeper C square keeper D. student
46—50BCBCD
It is only during the last few years that man has generally realized that in the world of nature a
balance exists between all forms of life . No living thing can exist by itself. It is a part of a system (体系) in which all forms of life are joined together . If we change one part of the nature order, this will in its turn almost certainly bring about changes in some other part .
The cutting down of forests reduces the supply of oxygen. The killing of weeds and insects by chemicals leads to the wide spread poisoning animals and birds . The throwing of waste products into the ocean does harm to life in the sea , while waste gases change the chemical balance of the atmosphere .
And so we could go on , adding more examples , until in despair (绝望) we might feel like giving up the struggle to control and keep within limits these harmful human activities . Man is very clever at changing the world around him to satisfy his immediate needs , but not so clever at looking far ahead , or thinking about what the future of his action might be .
36. The first paragraph mainly tells us that ___
A. everything in nature can’t exist without the help of human beings
B. no living things can exist naturally
C. all living things in nature depend on each other
D. man has well known the importance of the balance of nature for a long time
37. The example given in the second paragraph are used to prove that ___
A. it is very important to protect forests
B. there are some living things which can exist all by themselves without change
C. all forms of life belong to a system in which all the parts can be changed for one another
D. we cannot change one form of life or matter without disturbing the balance of nature
38. In the second paragraph the word “atmosphere”means ___
A. the production of chemical factories
B. the gas in the outer space
C. the mixture of gases that surrounds the earth
D. the health of the human body
39. The third paragraph suggests that ___
A. man shouldn’t think only about immediate needs instead of the future results
B. man is very clever at planning his distant future
C. man often feels that he has to give up in despair
D. man is always anxious to control and keep his activities within limits
40. Which of the follow may be the best title for this article ?
A. The Secret of Nature
B. The Balance of Nature
C. The Nature System
D. The Changes of Nature
Small cars may take the place of（代替）big cars in the future. There is 1 for only two people in such a car . If everyone 2 such a car , there will be less pollution 3 the air . There will also be more space for 4 cars in cities , and the streets will be less crowded . The little cars will cost 5 less . Driving will be 6 , too , as these little cars can go only 65 kilometres per hour . If big cars are still used along with the small 7 , two sets of road will be 8 in the future . Some roads will be used 9 the big , fast cars , and 10 roads will be needed for the slower small ones .
1. A. place B. space C. a room D. seat
2. A. rides B. drives C. pushes D. pulls
3. A. for B. on C. in D. at
4. A. stopping B. stop C. parking D. park
5. A. lots of B. many C. much D. more
6. A. danger B. dangerous C. safe D. safer
7. A. one B. ones C. seat D. seats
8. A. need B. needing C. needs D. needed
9. A. as B. by C. for D. in
10. A. the other B. the another C. another D. other
1－5 BBCCC 6－10 DBDCA
To find out whether bees can see colours, the following experiment is made. A table is put in a garden, and on the table is a blue card with some sugar on it. As soon as one bee finds the sugar, many more come to it one after another in a short time. It seems that one bee is able to tell the news of food to the other bees in their “home”. After a moment, the blue card with sugar on it is taken away. Instead of this card, another blue card is now put on the left side of the first feeding place and a red to its right. Nothing can be seen on the two cards. Very soon bees arrive again, and fly towards the blue card. No bees go to the red card.
( ) 1. How many cards are needed to make the experiment?________.
A. Two
B. Three
C. Four
D. Five
( ) 2. During Step3 of the experiment, the scientists put ______________.
A. a blue card with sugar on the left and a red card on the right
B. a blue card in the middle, another blue card on its left and a red card on its right
C. a blue card with nothing on it on the left and a red card on the right
D. a blue card on the left and a red card with sugar on the right
( ) 3. During Step3 of the experiment, the bees come to____________.
A. the new blue card with sugar on it
B. the new blue card with no sugar on it
C. the red card with no sugar on it
D. the first blue feeding card
( ) 4.The experiment tells us that bees __________.
A. can see colours
B. cannot see colours
C. like blue very much
D. don’t like red at all
( ) 5. Which is the best title for this passage? ___________.
A. Bees Love Sugar
B. Bees ,Colour and Sugar
C. Can Bees Speak?
D. Can Bees See Colours?
KEYS: BCBAD
Each year there is an increasing number of cars on the roads and streets and millions of new cars and trucks are produced. One out of every six Americans workers at putting together the parts of the cars, driving trucks, building roads, or filling with gas, Americans won’t live without cars! Most Americans would find it hard to think what life could look like without a car. However, some have realized the serious problem of the air pollution caused by the car. The polluted air becomes poisonous and dangerous to health.
One way to get rid of the polluted air is to build a car that does not pollute. That’s what several of the large car factories have been trying to do, but to build a clean car is easier said than done.
Progress in this field has been slow.
Another way is to take the place of the car engine by something else. Inventors are now working on steam cars as well as electric cars. Many makers believe that it will take years to develop a practical model that pleases man.
To prevent the world from being polluted by car, we’ll have to make some changes in the way many of us live. Americans, for example, have to cut down on the number of their total cars. They are encouraged to travel and to go to work by bicycle. Bicycling is thought to help keep the air clean.
But this change does not come easily—a large number of workers may find themselves without jobs if a car factory closes down. Thus the problem of air pollution would become less important than that of unemployment( 失业).
Although cars have led us to a better life, they have also brought us new problems.
( )41. How many Americans have something to do with cars?
A. twenty per cent of Americans
B. less than ten per cent of Americans
C. first sixth of Americans
D. one sixth of the whole population of America
( )42. What are Americans worried about ? They are worried about 。

A. the number of cars is increasing every year.
B. Americans can’t live without cars.
C. The air pollution caused by cars.
D. What life will look like without cars.
( )43. How many ways of making the air clear are suggested in this passage?
A. One
B. Two
C. Three
D. Four
( ) 44. Which of the following is wrong according to the passage?
A. The large factories are trying to make a car that doesn’t cause pollution.
B. Great progress has been made in making the air clean.
C. It’s very difficult to get rid of air pollution.
D. Americans are encouraged to travel and go to work by bicycle.
( )45. What conclusion does the write make in the passage?
A. Although cars make Americans live a better life, they cause serious problem of the air pollution .
B. Cars are important and necessary to Americans.
C. In order to get rid of the air pollution Americans should go to work by bicycle.
D. Many makers are sure to make a car that pleases Americans.
(B)
Pollution
The world itself is becoming much smaller by using modem traffic and modern communication means (通讯设备). Life today is much easier than it was hundreds of years ago, but it has brought new problems. One of the biggest is pollution (污染). To pollute means to make things dirty. Pollution comes in many ways. We see it, smell it, drink it and even hear it.
Man has been polluting the earth. The more people, the more pollution. Many years ago, the problem was not so serious because there were not so many people. When the land was used up or the river was dirty in one place, Man moved to another place. But this is no longer true. Man is
now slowly polluting the whole world.
Air pollution is still the most serious. It's bad for all living things in the world, but it is not the only one kind of pollution. Water pollution kills our fish and pollutes our drinking water. Noise pollution makes us angry more easily.
Many countries are making rules (法规) to fight pollution. They stop people from burning coal (煤) in houses and factories in the city, and from putting dirty smoke into the air.
Pollution by SO2 is now the most dangerous kind of air pollution. It is caused (引起) by heavy traffic. It is sure that if there are fewer people driving, there will be less air pollution.
The earth is our home. We must take care of it. That means keeping the land, water and air clean. And we must take care of the rise in population at the same time.
( )61. Our world is becoming much smaller ___.
A. because the earth is being polluted day and night.
B. thanks to science development
C. because of the rise in population
( )62. Thousands of years ago, life was ____ it is today.
A. much easier than
B. as easy as
C. much harder than
( )63. Pollution comes in many ways. We can even hear it. Here "it" means ____.
A. water pollution
B. air pollution
C. noise pollution
( )64. Air pollution is the most serious kind of pollution because ____.
A. it's bad for all living things in the world
B. it makes much noise
C. it makes us angry more easily
( )65. Which of the following is NOT true?
A. The pollution of the earth grows as fast as the world's population does.
B. If people could go to work by bus or bike instead of car or motorbike it would be helpful in fighting against the problem of SO2.
C. The problem of pollution is not so serious because there are not so many people living on the earth.
61-65 BCCAC
Pollution
The world itself is becoming much smaller by using modern traffic and modern communication means. Life today is much easier than it was hundreds of years ago . but it has brought new problems. One of the biggest is pollution. To pollute mean to make things dirty. Pollution comes in many ways. We see it , smell it , drink it and even hear it .
Man has been polluting the earth . The more people , the more pollution. Many years ago, the problem was not so serious because there were not so many people. When the land was used up or the river was dirty in a place , men moved to another place. But this is no longer true. Man is now slowly polluting the whole world .
Air pollution is still the most seriou s . It’s bad to all living things in the world , but it is not only one kind of pollution. Water pollution kills our fish and pollutes our drinking water . Noise pollution makes us become angry more easily .
Many countries are making rules to fight pollution . They stop the people from burning coal in houses and factories in the city , and from blowing dirty smoke into the air .
The pollution of SO2 is now the most dangerous problem of air pollution . It is caused by heavy traffic . It is sure that if there are fewer people driving , there will be less air pollution .
The earth is our home . We must take care of it . That means keeping the land , water and air clean . And we must keep careful of the rise in pollution at the same time .
( ) 1. Our world is becoming much smaller ___________ .
A. because the earth is being polluted day and night .
B. thanks to science developing .
C. because of the rise in pollution
D. because the earth is blown away by the wind every year . ( ) 2. Thousands of years ago , life was __________ it is today .
A. much easier than
B. as easy as
C. as hard as
D. much harder than
( ) 3. Pollution comes in many ways . We can even hear it . Here “it” means ___________ .
A. water pollution
B. air pollution
C. noise pollution
D. rubbish
( ) 4. Air pollution is the most serious kind of pollution because __________ .
A. it’s bad to all living things in the world .
B. it makes us because angry more easily .
C. it has made our rivers and lakes dirty .
D. it makes much noise .
( ) 5. Which of the following is not true ?
A. The problem of pollution is not so serious because there are not so many people .
B. From now on , maybe people try to go to work by bus or bike instead of car or motorbike . It is helpful to fight against the pollution of SO2 .
C. The pollution of the earth grows as fast as the world’s pollution does .
D. Many countries are making rules to fight pollution .
KEYS:BDCAB
Some people think that all wild animals are dangerous . Actually , very few of them will attack a man if he leaves them alone . If you met a lion or an elephant , suppose, you would run away , but even a lion will keep away from a man unless it is very hungry . Lions and tigers only kill and eat men when they have grown too old and too weak to catch their usual food , such as deer and other small animals . If you saw a wild elephant , perhaps you would be frightened . Elephants usually run away at once unless you attack them . Some animals get very frightened if they only smell a man ; some take no notice at all but quietly walk in another direction . Wild animals only attack hunters when they are afraid that the hunters mean to harm their young ones , or then the hunters shoot at them and make them angry .
( ) 1. The word attack is closest in meaning to _____________ .
A. hurt
B. catch
C. hit
D. follow
( ) 2. Lions and tigers will not kill or eat men ____________ .
A. unless men try to away
B. if they are too old and too weak
C. if they are able to get enough of their usual food
D. however men act towards them
( ) 3. Some animals run away when they smell a man probably because ______________ .
A. they dislike the smell
B. they think men are dangerous to them
C. they don’t want to eat men
D. they want to eat weak men
( )4. Some wild animals will because very dangerous ______________ .
A. when they grow old
B. if they are left alone
C. while they are looking for food
D. when their young ones are in danger
( ) 5. This passage is mainly about______________ .
A. how to protect wild animals
B. how animals look for their food
C. how to make friends with wild animals
D. how animals act towards men
The population problem may be the 1 one of the world today．The world's population is
growing 2 ．Two thousand years ago, there were only 250 million people 3 the earth．Four hundred years ago, the number was 4 500 million．But at the beginning of the 5 century, the world's population was about 1,700 million．In 1970, this number was 3,600 million．In 1990, the number was five billion．A 6 report says that the world population will 7 six billion by the end of the 20th century．This is just ten 8 after it 9 five billion．People say that by the year 2010, 10 may be seven billion．
1．A．great B．greater C．greatest D．greating
2．A．faster and faster B．fast and fast
C．fastest and fastest D．faster and fast
3．A．in B．on C．at D．for
4．A．nearly B．more C．almost D．over
5．A．twenty B．twelve C．twentieth D．twelfth
6．A．USA B．UN C．PRC D．PLA
7．A．past B．pass C．passed D．passes
8．A．weeks B．months C．seasons D．years
9．A．get B．gets C．reached D．reach
10．A．this B．its C．one D．it
KEY: 1．C 2．A 3．B 4．D 5．C 6．B 7．B 8．D 9．C 10．D
2．
The world is not only hungry, but it is also thirsty for water. This may seem strange to you, since nearly 70% of the earth’s surface (表面) is covered with water. But about 97% of that is sea water,or salt water. Man can only use the other 3%---the fresh water from rivers, lakes, underground, and other sources(源泉). And we can not even use all of that. Even worse, some of it has been made dirty.
However, as things stand today, this fresh water is still enough for us. But our need for water is becoming larger and larger quickly---- almost day by day. We should take steps to do with this problem now and in this way we can get away from a serious world---wide water shortage（缺乏) later on.
We all have to learn how to stop wasting(浪费) our valuable water. One of the first steps is to develop (开发) ways of reusing it. Today in most large cities, water is used only once and then sent out into a sewer system（下水道）. From there it returns to sea or runs into underground places. But even if every large city reused its water, we still would not have enough. All we’d have to do to make use of sea water in the world is to remove the salt. If we take these we will be in no danger of drying up.
56．The world is thirsty for water because_________.
A. man has not got enough food to eat.
B. We haven’t got enough fresh water.
C. Only 70% of the earth’s surface is water.
D. More water is sent into sewer system
57. The underlined word valuable means ______.
A. much and salty
B. fresh and enough
C. dear and useful
D. clean and helpful
58. What should we do if we want to have enough fresh water?
(a) Make full use of the sea water.
(b) Carry salt water into lakes or rivers
(c) Try to save the fresh water as much as possible.
(d) Do our best to use the water again.
(e) Drink and use all the water on the earth’s surface.
A. (c) and (e)
B. (a) and (d)
C. (a), (c) and (d)
D.(b) (d) and (e)
59. The best but the most difficult way to solve the water problem of the world is to _______.
A. remove the salt from sea water
B. make the water in cities clean.
C. take the water from underground
D. make the need for water smaller
60. What is the best title for this passage？
A. The Importance of the water
B. The World’s Water Problem
C. The Thirsty World
D. Fresh Water and Sea Water
KEYS:56-60 BCCAB
3．
Trees are useful to man in three very important ways. The first important way is that they provide man with food, wood and other products. Trees provide not only with food but also many animals with food. Without trees many animals could not live on the earth. It’s not easy for man to live on the earth, either.
The second important way is that trees give us shade. On a hot summer day, people are eager to have a rest under the shade of a tree after they have walked a long way. You can imagine how important the shade of a tree is to man and to animals.
The third important way is that trees help to prevent drought(干旱) and floods. However, in many parts of the world, man has not realized the third important way. He has cut trees down in large numbers. In the end he finds that he has lost the best friends he had.
( ) 1. Trees are important to man in _________ways.
A. 2
B. 3
C. 4
D. 5
( ) 2. Which sentence is TRUE?__________.
A. Trees only provide animals with food
B. Trees only provide man with food
C. Trees give food to neither man nor animals
D. Trees give food to both man and animals
( ) 3. On a hot summer day,________________.
A. the shade of a tree is very important to man and to animals
B. people are eager to have a rest
C. people usually walk a long way
D. animals don’t need any shade
( ) 4. In many parts of the world, man has not realized that trees help to___________.
A. give us food
B. give us shade
C. prevent drought and floods
D. give us wood
( ) 5. In this story the word”He”means____________.
A. farmer
B. man
C. worker
D. boy
KEYS:BDACB
4.
Bamboo is one of nature’s most surprising plants. Many people call this plant a tree, but it is a kind of grass.
Like other kinds of grass, a bamboo plant may be cut very low to the ground, but it will grow back very quickly. A Japanese scientist reported one bamboo plant which grew 1.5 metres(4 feet) in 24 hours! Bamboo grows almost everywhere in the world except in Europe. There are more than 1,000 kinds of bamboo.
Not all bamboo looks the same. Some bamboo plants are very thin. They may only grow to be a few centimeter wide while others may grow to more than 30 centimeters(1 foot) across. This plant also comes in different colors, from yellow to green to black.
Bamboo has been used to make things such as hats and kitchen tools. Because it is strong, bamboo is also used to build buildings.
Many Asia countries have used bamboo for hundreds of years. They often use bamboo for buildings and supporting new buildings and bridges while they are being built.
In Africa, poor farmers are taught how to find water using bamboo. These African countries need cheap ways to find water because they have no money, and their fields often die from no rain and water. Bamboo pipes(管子) help poor farmers bring water to their thirsty fields without spending a lot of money.
( ) 1. How is bamboo like grass? ___________.
A. It grows quickly
B. It is wood
C. It is easy to cut
D. It is very thin
( ) 2.Though you can see bamboo everywhere, it doesn’t grow_____________.
A. in China
B. in Europe
C. in Africa
D. on mountains
( ) 3.Why is bamboo used by African poor farmers? Because ________.
A. it is cheap
B. it has different colors
C. it is strong
D. it has been used by Asians
( ) 4. Bamboo pipes can__________________.
A. make money
B. be trees
C. grow quickly
D. carry water
( ) 5. In Asia, bamboo has been used for ______________.
A short time B. many thousands of years
C. many hundreds of years
D. about 100 years
KEYS: ABADC
Many of the world’s pollution problems have been 1 by the crowding of large groups of people into cities. Supply for the 2 of the people leads to 3 pollution by industry. If the 4 increase in human population 5 at the present rate (比率), there may be much greater harm. Some scientists speak of the 6 in number of people as “population pollution.”
About 2000 years ago, the world 7 was probably about 250 million. 8 reached a billion in 1850. By1930 the population was two billion. It is 9 three and a half billion. It is 10 to double by the year 2000. If the population continues to grow at the same 11 , there would be 25 billion people in the world a hundred years from now.
Man has been using the earth’s 12 more and more rapidly over th e years. Some of them are almost 13 . Now many people believe that man’s greatest 14 is how to control the growth of his population. The 15 in the world will not support the human population, in time to come, if the 16 rate of increase continues. 17 there is over crowding in the 18 and hunger in some countries. Can man’s rate of increase 19 ? Many people believe that human survival (幸存者) in the future
depends on the answer 20 the question.
1. A. made B. caused C. led D. worked out
2. A. needs B. satisfies C. service D. lacks
3. A. farther B. less C. further D. better
4. A. harmful B. small C. slow D. rapid
5. A. stops B. continues C. slows down D. adds to
6. A. increase B. reduce C. quality D. quantity
7. A. people B. situation C. population D. land
8. A. They B. You C. We D. It
9. A. now B. in the past C. in the future D. then
10. A. hoped B. expected C. wished D. looked forward to
11. A. time B. amount C. rate D. number
12. A. place B. oil C. mines D. resources
13. A. missed B. rich C. gone D. enough
14. A. problem B. power C. plan D. idea
15. A. food B. electricity C. energy D. materials
16. A. past B. present C. future D. slow
17. A. Already B. Yet C. Still D. Often
18. A. villages B. mountains C. cities D. farms
19. A. continue B. exist C. fall D. keep
20. A. in B. of C. to D. for
答案与分析
全文解释了污染和人口间的关系：人口的增长带来了新的污染，并加剧了原有的污染，世界能源枯竭。

1. B 世界污染问题由大量人口涌入城市引起。

2. A 人们涌入城市后，对人们的需求的供应导致了污染。

3. C further意思是“更进一步的”。

人们涌入城市，需求供应加剧了城市污染。

4. D rapid increase 迅速的增长。

5. B 如果人类的污染以目前迅速增长的比率发展下去，……。

6. A 全文讲了人口增长与污染的关系，因此此空填increase。

7. D从空后的250 million看，作者在这里讲的是2000 年前世界的人口。

8. D It指the world population。

9. A 从此空所在句的上一句和下一句看，此空所讲的是现在的情况。

10. B 这个数字是人们的猜测和料想，因此选expected。

11. C前面介绍了各个时期的人口数量的增长，接下来作者说，“如果以这个比率增长的话，……。

”
12. D resources意思是“资源”，它包括coal, oil和mines。

13. C 这些能源中的一部分已经失去。

gone 在这里为形容词，意思是“不见”。

14. A 人类最大的问题是如何控制人口的增长，这也是作者通过上述分析得出的结论。

15. D 在此A有较大干扰性，通过前后文我们得知，人口再增长，不仅仅是食物、电和能源而且还有许多东西不能满足人们，因此materials为最佳答案。

16. the present rate of increase 目前的增长比率。

17. A能源危急的情况已经(already)出现。

18. C从短文的第一句Many of the world’s pollution problems have been 1 (caused) b y the
crowding of large groups of people into cities得此答案。

19. A人口的这种比率还会持续增长下去吗？
20. C the answer to the question 这个问题的答案。

5．
Have you ever seen a film about sharks? One of the most famous films about sharks() is the American film called “Jaw”. This film is for those who are not easily frightened.
In this film, a huge man-eating shark, called “Jaw”, started to attack swimmers in a holiday seaside town in Florida in the USA. Florida is known as “the sunshine sea”, and tourism is big business. The businessmen living in the town want to keep the attacks secret, as they are bad for business. The Chief of Police, the Sheriff, wants to make the news public. However, Jaws makes himself known to the swimmers.
For much of this film, the audience are sitting on the edge of their seats, wondering when the next shark attack will take place.
( ) 1. Jaws is the name of___________.
A. a horse
B. a shark
C. a policeman
D. a traveller
( ) 2. Florida is_________________.
A. in the north of the USA
B. in the west of the USA
C. an island near the USA
D. in the south of the USA
( ) 3. What do you think of this film?______________.
A. It’s frightening
B. It’s sad
C. It’s uninteresting
D. It’s boring
( ) 4. The Chief of Police wants_____________.
A. to make himself known to swimmers
B. to fight the shark
C. to let the public know the shark attacks swimmers
D. to swim in the sea
( ) 5. The main idea of this passage is _______________.
A. to let us know the shark
B. to introduce a film
C. to advise people to go to Florida
D. warn us against the shark
KEYS:BDACB
6.
Forests have always been useful and important to man who makes use of them in many ways. Every day trees serve man everywhere. Trees supply man with fruits and building materials in the form of wood. Without trees it would be impossible to build houses, boats, bridges and so on. Furniture, such as desks, chairs and beds, is made of wood. Trees can stop man from terrible heat. They are also useful in stopping good and rich top soil from being washed away during heavy rains.
If there were no trees, heavy rains would wash away the rich surface soil that is so important to plants. The result is that the land will become a desert. There are plenty of desert areas in the world. A long time ago these desert areas used to be very rich areas, but man in the past had not enough knowledge about science of nature, and cut down too many trees in the area where they lived and never planted new ones. Soon the rich surface soil was blown and washed away by strong winds and heavy rains. In the end the rich land changed into useless deserts where nothing could grow.
( ) 1. According to the passage, ______________ .
A. a long time ago, man didn’t know how to make use of wood。