Trees should only be pruned (修剪) when there is a good and clear reason for doing so and , the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.
First, pruning may be done to make sure that trees have desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches, which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut out diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the center and so preventing the free movement of air.
One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease , but it is a wound that will heal (愈合). Often there is a race between the healing and the disease as to whether the tree will live or die, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce that risk of death as far as possible. It is important to make the area, which has been pruned, smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hours and then paint it with one of the materials available from garden shops produced especially for this purpose. Pruning is usually done in winter , for then you can see the shape of the tree clearly without interference (妨礙) from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly .
小題1:.Why should pruning be done?
A.To make the tree grow taller.B.To improve the shape of the tree.
C.to get rid of the small ranches .D.To make the small branches thicker.
小題2:.Trees become unhealthy if the gardener__________.
A.giving a tree a special shape and a definite height
B.removing small side branches and making a tree look less thick
C.a(chǎn)llowing too many branches to grow in the middle
D.having a tree surrounded by many other trees
小題3:.Why is a special material painted on the tree?
A.To help a wound to dry.B.to cover a rough surface.
C.To make a wound smooth.D.To prevent disease entering a wound.
小題4:.A good gardener prunes a tree _________ .
A.several times throughout the year B.a(chǎn)s quickly as possible
C.occasionally when necessaryD.regularly every winter
小題5:.What was the author’s purpose when writing this passage?
A.To discuss different methods of pruning.
B.To introduce some common knowledge of pruning.
C.To explain how trees develop disease.
D.To give practical instruction for pruning a tree.

小題1:.B
小題1:.C
小題1:.D
小題1:.C
小題1:.B
練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中英語 來源:不詳 題型:完形填空

One day, I was working alone on the roof of a new six-story building. When I completed my work, I discovered that I had about 500 pounds of bircks left over!   36 carry the bricks down by hand I decided to lower them by a pulley(滑車), which fortunately was  _37 to the side of the building on the sixth floor.
Fastening the rope at the ground level, I went up to the roof and  _38 the bricks into a barrel (桶). Then I went back to the  _39 and untied the rope,   40 it tightly to insure a __41__  fall of the 500 punds of bricks. You know, I only weighed 135 pounds. Due to my __42 _ at being pulled off the ground so suddenly, I lost my presence of mind and  _43  to let go of the rope. Needless to say, I went on at a rather  _44 _ rate up the building.
Near the third floor, I met the barrel __45 , which made my collarbone(鎖骨)broken, __46 _ only slightly, I didn’t stop. At approximately(大約)the same time, the barrel  _47__ the ground, and the bottom fell out of the barrel.   48 the bricks, the barrel now weighed about 50 pounds. I refer you again to my weight of 135 pounds.  _49   you might imagine, I began a rapid down.
Also near the  _50 _ floor, I met the barrel coming up, which made my legs broken. The encounter(相遇)with the _ 51 _ slowed me enough to reduce my  _52 when I fell onto the pile of bricks, and  53 , only three vertebrae(椎骨)were broken. However, as I __54__there on the bricks in pain, unable to move, and  _55  the barrel six stories above, I again lost my presence of mind. I let go of the rope!
小題1:
A.Rather than B.Other thanC.Better thanD.Instead of
小題2:
A.connectedB.a(chǎn)ttached C.a(chǎn)ddedD.joined
小題3:
A.broughtB.carriedC.loadedD.took
小題4:
A.ceilingB.floor C.roofD.ground
小題5:
A.grabbingB.pulling C.fasteningD.holding
小題6:
A.suddenB.quick C.slowD.peaceful
小題7:
A.carelessnessB.surpriseC.excitementD.joy
小題8:
A.forgotB.had C.tookD.began
小題9:
A.slowB.rapid C.strangeD.special
小題10:
A.coming downB.going upC.going downD.coming up
小題11:
A.SlowedB.Calmed C.RelaxedD.Cooled
小題12:
A.fellB.beat C.hitD.knocked
小題13:
A.BesidesB.WithoutC.WithD.Beyond
小題14:
A.AsB.When C.WhileD.Which
小題15:
A.firstB.ground C.secondD.third
小題16:
A.bricksB.barrel C.pulleyD.rope
小題17:
A.painB.weight C.injuriesD.speed
小題18:
A.unluckilyB.surelyC.undoubtedlyD.fortunately
小題19:
A.satB.lay C.stoodD.bent
小題20:
A.noticedB.rememberedC.watchedD.saw

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

There was a park near my home. But I didn’t go there very often. Many people said there was nothing special. One afternoon I went into the park and found it was really small. I walked quickly because there wasn’t much to see. I walked for some time and found myself standing in front of two paths. 71  I found that the two paths were different from each other.
The left one was wide and clean. There were lots of flowers on both sides of the path. Though the flowers weren’t very beautiful, they made me feel good. I decided to take this path. But wait! I looked at the right one. The path didn’t look nice.  72  Grass grew everywhere. For a long time I couldn’t make up my mind.
  73  It wasn’t nice , but I didn’t want to give up. At last, I came to the end of the path. Ah! There was a small garden there. It was beautiful, perhaps the most beautiful garden I had ever seen.  74  
Many people told me that there was nothing much to see in the park. Now I’d like to tell them that if they had followed the right way, they would have felt differently. But when I told them about what I had seen in the park, they just smiled at me without saying a word. I knew they didn’t believe me. They couldn’t even remember that path because it was so small.
  75  Don’t be afraid to choose a different path. You may get a big surprise!
A.There is nothing that I want to see.
B.It looked like it had not been cleaned for months.
C.After a while a strange feeling made me follow the dirty path.
D.“ Which way should I go?” I asked myself. I looked at one way, then the other.
E. I told them what happened.
F. My trip to the park that day made me understand something about life.
G. There were trees, flowers and chairs. I thought it was the nicest part of the park.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Most of the news in the newspapers is bad but sometimes there is a story with good news. This is one of those stories. Millions of people around the world suffer from AIDS, malaria, tuberculosis, and other serious diseases. There are medicines to treat these diseases but for people in poor countries, these medicines are too expensive to buy. When a pharmaceutical(制藥的)company produces a new medicine, they receive a special license called a patent. This license means that the new medicine or drug is protected for a period of 20 years. The company that produced the drug can fix the price of the drug and no other company is allowed to produce the same drug or a copy of the drug for 20 years. At the moment, these patents operate all over the world, both in rich countries and in poor countries. The drugs companies say that they need patents so that they can get the money to pay for research to find new drugs and medicines. In rich countries people usually have enough money to pay for these drugs but in poor countries people can’t afford to buy them and cannot treat diseases like AIDS and malaria.
Last month, however, a group of experts published a report which says that patents are very bad for poor countries. The report says that drug companies do not want to find new medicines for diseases of poor people in poor countries. It says that poor countries should be allowed to buy cheap drugs without patents from other countries.
The authors of the report were lawyers, scientists and a senior director from the drug company Pfizer. Of course, the pharmaceuticals industry doesn’t agree with the report, “We need patents so that we can develop new medicines to fight disease both in the developed and developing world,” said a spokesman. But the report is the first sign that there might be a change in the patent system. This change could save millions of lives in the world’s poorest countries. This really is good news.
小題1: Why are medicines expensive for people in poor countries?
A.They are protected by patents.B.They are produced in rich countries.
C.They are imported.D.They can cure the deadly diseases.
小題2: What does the underlined word “patent” in Para1 mean in Chinese?
A.執(zhí)照B.專利權(quán)C.專利品D.商標(biāo)
小題3:Why do drugs companies need patents?
A.To sell drugs in rich countries.
B.To sell drugs in poor countries.
C.To get money to produce new drugs.
D.To compete with other companies.
小題4: What does the report say?
A.Poor countries should spend more money on drugs.
B.Poor countries shouldn’t obey a pharmaceutical patent.
C.Poor countries should import drugs.
D.Poor countries should be allowed to make copies of drugs.
小題5:What might happen if the patent system is changed?
A.Millions of lives will be saved in poor countries.
B.Drugs companies will stop producing drugs.
C.Drug companies will make more money.
D.The competition will be canceled.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Tuvalu, north of Fiji, is a tiny country in the Pacific Ocean.
Storms and huge waves are a constant threat and none of Tuvalu's nine little islands is more than five metres above sea level. Salt water is already entering the country's drinking water supply, as well as damaging plants that produce fruit and vegetable.It fears it will be swallowed up by the sea. Without urgent help, the country's days are numbered.
But Tuvalu is not the first place to face sinking into the sea. Venice, a historic city in Italy best known for its canals, has sunk about 24cm over the past 100 years. Experts say that it will have sunk another 20-50cm by 2050. A century ago, St. Mark's Square, the lowest point in the city, flooded about nine times a year. Nowadays, it happens more than 100 times.
While Venice is slowly sinking into the mud on which it stands, Tuvalu's rising sea level is caused by global warming.
The average global temperature has increased by almost 0.5 centigrade degree over the past century; scientists expect it to rise by an extra 1-3 degrees over the next 100 years.
Warmer weather makes glaciers melt, adding more water to the ocean. The warmer temperatures also make water expand, so it takes up more space, causing the sea level to rise. The sea level has risen about 10-25cm in the last 100 years.
People have been increasing the greenhouse gases in the atmosphere, such as CO2, through burning coal, oil and gas. This adds to the power of the greenhouse effect, making the planet even warmer.
Many scientists believe that, if the warming is not stopped, there will be huge climate changes. The sea level could rise by one metre this century.
Should this come true, millions of homes would be swallowed up by the sea and the world will be flooded with "climate refugees" looking for somewhere else to live.
小題1: We can infer from Paragraph 2 that ______.
A.Tuvalu is in danger of being swallowed up by the sea
B.a(chǎn)ll Tuvalu’s islands are about five meters above the sea level
C.drinking water in Tuvalu has been destroyed
D.Tuvalu is often flooded by storms and waves
小題2:The author uses Tuvalu and Venice as examples in order to explain ______.
A.they are the first places sinking into the sea
B.they are both sinking into the mud where they stand
C.they will disappear in the future
D.their trouble is caused by global warming
小題3: What does the underlined word “refugees” mean?
A.People forced away from their homeland.
B.Sudden changes caused by world climate.
C.Animals whose lives are closely connected with weather.
D.Bad effect of climate changes.
小題4: Which of the following is NOT true according to the text?
A.The main cause of global warming is human pollution.
B.The average global temperature has risen by 1-3 centigrade degrees over the past 100 years.
C.The warmer temperature causes the sea level to rise.
D.There will be huge climate changes unless the warming is stopped.
小題5:According to the passage, the root cause of global warming is _______.
A.the burning of coal, oil and gasB.the position change of the solar system
C.human pollutionD.carbon dioxide emission

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

              Four common bad habits combined—smoking, drinking too much, inactivity and poor diet—can age you by 12 years, sobering new research suggests.
The findings are from a study that tracked nearly 5,000 British adults for 20 years, and they highlight yet another reason to adopt a healthier lifestyle.
Overall, 300 people studied had all four unhealthy behaviors. Among them, 90 died during the study, or 30 percent. Among the 400 healthiest people with none of the four habits, 8 percent of them died.
The risky behaviors were: smoking tobacco; downing more than three alcoholic drinks per day for men and more than two daily for women; getting less than two hours of physical activity per week; and eating fruits and vegetables fewer than three times daily.
These habits combined substantially increased the risk of death and made people who engaged in them seem 12 years older than people in the healthiest group, said lead researcher Elisabeth Kvaavik of the University of Oslo.
The healthiest group included never-smokers and those who had quit; teetotalers, women who had fewer than two drinks daily and men who had fewer than three; those who got at least two hours of physical activity weekly; and those who ate fruits and vegetables at least three times daily.
"You don't need to be extreme" to be in the healthy category, Kvaavik said. "These behaviors add up, so together it's quite good. It should be possible for most people to manage to do it."
The US government generally recommends at least 4 cups of fruits or vegetables daily for adults, depending on age and activity level, and about 2 hours of exercise weekly.
小題1:What problem may you have, if you smoke often and eat few fruits and vegetables?
A.You would have difficulty in walking.B.You would feel tired, lack of energy.
C.You may look older than you really are.D.You may face the risk of death of cancer.
小題2:How many of the 400 healthiest people with none of the four habits died?
A.32.B.24.C.56.D.120.
小題3:What does this text mainly talk about?
A.Suggestions to smokers.B.The results of four bad life habits.
C.The findings of a new research.D.The recommends from the US government.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

What is red but green, open but closed and old but new?
The answer is: London’s new double-decker(雙層)buses.
Red double-deckers are a symbol of the city. Their status was sealed (確定) in 2008 when one bus made the longer-than-usual trip to Beijing to collect a special passenger: the Olympic Flame.
On November 11, a life-size model of the new bus was shown to the media. The Guardian reported that the new design shares some of the features of the much-missed double-decker Routemaster bus. The original Routemaster was introduced in 1956 but December 2005 saw the end of the old bus’s general service. It was because the bus was difficult for some passengers to use and not environmentally friendly. But it can still be seen on two heritage routes in the city.
Its replacements —boxy, modern double—deckers—have failed to win Londoners’ affection.
London mayor Boris Johnson told the BBC that the new buses were “a combination of nostalgia(懷舊)and the latest technology”. “Standing on the back platform of this bus brings a sense of nostalgia but also shows the best part of the latest technology and design, making this bus fit for the 21st Century,” he said.
The new bus also returns to the driver—and—conductor model—a key feature of the original version. It will be quieter than the old type and have a platform offering passengers the traditional hop—on hop—off service.
The first five new buses will be seen on the roads by early 2012.
小題1:Which of the following shows that red double—deckers are a symbol of London?
A.They have a long history and are seen everywhere in London.
B.They have nothing in common with the traditional Routemaster bus.
C.One such bus went from London to Beijing to collect the Olympic Flame.
D.They carried British athletes from London to attend the Beijing Olympics.
小題2:Which of the following is true of the original Routemaster?
A.The bus came into use in the 1960s.
B.The bus was banned because it was harmful to the environment.
C.Passengers didn’t like the bus because it was slow.
D.Visitors to London cannot see such buses on the roads any more.
小題3:According to London mayor Boris Johnson, the new Routemaster          .
A.has not been as well received as was expected
B.will be widely used in London in 2012
C.is the most environmentally friendly bus in the UK
D.combines the latest technology with key traditional features
小題4:What is the characteristic of the new red double – deckers?
A.The buses will make no noises.
B.The buses will have no conductors.
C.They will be equipped with air – conditioning.
D.The bus platform will offer passengers a traditional service.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Are you interested in country music? I like it very much! It will take me away for a while after I am tired .The guitars and songs will take me to mountains and fields.
Country music usually talks of everyday life and feelings. It’s the spirit of America, easy to understand, slow and simple.
Country music developed in the Southern United States. It was the folk music of American countryside. Many of songs tell about the lives of famers .They talk about love, crops or death.
The life of the countryside can be hard, so the words in country music are often sad. At first, people played the music only at family parties. But it became more popular later. In the 1920s, people played country songs on the radio, and they made them into records.
When people in the countryside moved to towns and cities to look for work, they took their music with them. Country music continued to change and became popular across America.
John Denver was one of America’s most famous country singers in the 1970s.His song “Take Me home, Country Roads” is well-known and people still play it today.
小題1:Country music is usually about _______.
A.everyday life and feelings
B.farmers’ feelings
C.the lives of workers
D.the lives of farmers
小題2:People began to make country song records _______.
A.in the 1920sB.in 1920
C.in the 1970sD.in 1970
小題3: Why did Country music become popular in America?
A.Because city people liked the music.
B.Because farmers moved to cities with their music and it continued to change.C.Because country music talked about city people’s lives.
D.Because country music developed in the Southern Africa
小題4:Who is famous for the song “Take Me Home, Country Roads”?
A.A farmer in the countryside.
B.A person who moved to towns
C.John Denver.
D.John Denver’s brother

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

  If you don’t want people to know too much about you, then you had better keep your fridge contents secret according to a British market research document released         Finally, a fridge filled with nothing more than a bottle of white wine and some sparkling mineral water implies an owner who is single, lives in a big city and enjoys the finer things in life.The fridge is empty because this person regularly eats in restaurants.

小題1:We can know from the first two paragraphs that _________________.
A.some researchers are fond of staring at other people’s fridges
B.people don’t want others to know about their secrets
C.the food you put in the fridge has something to do with your personality
D.there are mainly five kinds of lifestyles among British people
小題2:According to the passage, people who belong to “food faddies” ____________.
A.don’t care much about money when buying things
B.will try their best to stay healthy
C.often stay up late to finish their job
D.prefer to ask others about what to do next
小題3:What will those who often dine out put in the fridge?
A.All kinds of food they like.B.Food rich in vitamins.
C.Fruit, vegetables and meat.D.Only something to drink
小題4:What might be the most suitable title for the text?
A.Keep your fridge a secretB.You are what’s in your fridge
C.What to put in the fridge?D.Be careful about your fridge

查看答案和解析>>

同步練習(xí)冊答案